JP2019124160A - engine - Google Patents

Abstract

An object of the present invention is to accurately detect an abnormality of an external oil pump while suppressing an increase in manufacturing cost. An engine ECU includes a step (S108) for commanding operation of an external oil pump, a step (S110) for commanding operation of a variable valve timing device, and a case where the actual operation angle does not follow the command operation angle. (NO in S112), the step of turning on the abnormality flag of the variable valve timing device (S114), the step of instructing the operation of the cylinder deactivation device (S116), and the case where the cylinder deactivation device is not activated (S118) NO), the step of turning on the abnormality flag of the cylinder deactivation device (S120), and if it is determined that both the cylinder deactivation device and the variable valve timing device are in an abnormal state (YES in S122), the external oil pump is closed. The process including the step of turning on the abnormality flag (S124) is executed. [Selection diagram] FIG.

Description

  The present invention relates to abnormality detection of an engine provided with a built-in oil pump and an external oil pump.

  Conventionally, the engine is provided with a cylinder deactivation device and a variable valve timing device as means for improving the thermal efficiency. As an engine provided with a cylinder deactivation device, for example, JP-A-2016-183628 (Patent Document 1) discloses a technique for accurately determining the operating state of the cylinder deactivation device in an internal combustion engine equipped with a cylinder deactivation device. ing.

  The cylinder deactivation device and the variable valve timing device as described above operate by the hydraulic pressure supplied from the oil pump. Such an oil pump may be built into the engine and operate using the engine as a power source.

JP, 2016-183628, A

  In engines provided with accessories that operate using oil pressure such as the above-mentioned cylinder deactivation device and variable valve timing device, an external oil pump is added to secure the oil pressure especially in the engine speed range where engine speed is low. May be

  If an abnormality occurs in such an external oil pump, the cylinder deactivation device, variable valve timing device, and the like can not be properly operated. Therefore, the occurrence of an abnormality in the external oil pump is detected with higher accuracy. Is required. For example, it is conceivable to detect an abnormality with high accuracy by newly providing various sensors such as a hydraulic pressure sensor to the external oil pump, but there is a possibility that the manufacturing cost may increase.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide an engine that detects an abnormality of an external oil pump with high accuracy while suppressing an increase in manufacturing cost.

  An engine according to one aspect of the present invention includes a plurality of cylinders, a first oil pump built in the engine body, which generates an oil pressure according to the engine speed, and an engine body provided outside the engine body. An electric second oil pump that generates an oil pressure when within a defined rotational speed region, and a plurality of cylinders using hydraulic pressure generated in at least one of the first oil pump and the second oil pump A cylinder deactivation device for closing a valve provided at the top of any one of the cylinders and stopping some of the cylinders, a variable valve timing device for changing the opening and closing timing of the valve using hydraulic pressure, (2) A control device that controls the oil pump, the cylinder deactivation device, and the variable valve timing device. When the engine speed is within a predetermined engine speed range and commands operation to the cylinder deactivation device and the variable valve timing device, the control device controls the operation of the cylinder deactivation device and the variable valve timing device. If the operating state of at least one of the devices is not the operating state corresponding to the control command for the second oil pump, it is determined that the second oil pump is in an abnormal state.

  In this case, for example, when the second oil pump is instructed to operate, at least one of the cylinder deactivation device and the variable valve timing device does not operate, or the second oil pump is operated. When at least one of the devices is operating when the operation stop command is issued, it can be determined that the second oil pump is in an abnormal state. Therefore, it is possible to accurately determine whether or not the second oil pump is in an abnormal state without providing new sensors.

  Preferably, the control device controls the cylinder deactivation device and the variable valve timing when the engine rotation speed is within a predetermined rotation speed region and commands operation to the cylinder deactivation device and the variable valve timing device. The second oil pump is in an abnormal state when the number of times it is determined that the operating state of any one of the devices is not the operating state corresponding to the control command for the second oil pump is more than a predetermined number of times It is determined that

  In this case, the second oil pump is determined by determining that the operation state of any one of the cylinder deactivation device and the variable valve timing device is not the operation state corresponding to the control command for the second oil pump. It can be determined with high accuracy whether or not is an abnormal state.

  More preferably, the control device is configured to command the operation to each of the cylinder deactivation device, the variable valve timing device, and the second oil pump when the engine rotation speed is within a predetermined rotation speed region. When both the cylinder deactivation device and the variable valve timing device are in the operation stop state, it is determined that the oil pressure generated in the second oil pump is in an abnormal state in which the oil pressure does not increase.

  In this way, it is possible to determine with high accuracy whether or not there is an abnormal state in which the hydraulic pressure does not rise in the second oil pump.

  More preferably, the control device instructs the operation of each of the cylinder deactivation device and the variable valve timing device while the engine rotation number is within a predetermined rotation number region and for the second oil pump. When commanding to stop the operation, when both the cylinder deactivation device and the variable valve timing device are in the operating state, it is determined that the abnormality is such that the oil pressure generated in the second oil pump does not decrease.

  In this way, it can be determined with high accuracy whether or not there is an abnormal state in which the hydraulic pressure does not decrease in the second oil pump.

  According to the present invention, it is possible to provide an engine that detects an abnormality of an external oil pump with high accuracy while suppressing an increase in manufacturing cost.

It is a figure showing a schematic structure of an engine concerning this embodiment. It is a figure for demonstrating the operating state of an external oil pump, a cylinder rest device, and a variable valve timing device in the time of normal and abnormal of an external oil pump. It is a flowchart which shows the closing abnormality detection process for detecting the closing abnormality of an external oil pump. It is a flowchart which shows the open abnormality detection process for detecting the open abnormality of an external oil pump. It is a timing chart for explaining operation of an engine at the time of execution of closed abnormality detection processing. It is a timing chart (the 1) for explaining operation of an engine at the time of execution of open abnormality detection processing. It is a timing chart (the 2) for explaining operation of an engine at the time of execution of open abnormality detection processing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description about them will not be repeated.

<About the composition of engine 1>
FIG. 1 is a view showing a schematic configuration of an engine 1 according to the present embodiment. In the present embodiment, the case where the engine 1 is an internal combustion engine and is a gas engine that operates using gaseous fuel such as city gas or LPG will be described as an example. The engine 1 is mounted, for example, as a motive power source such as a gas heat pump used for an air conditioner or the like.

  The engine 1 includes an intake system 2, an exhaust system 4, an engine body 10, and an engine ECU (Electronic Control Unit) 200.

  The intake system 2 includes an intake manifold 40, a throttle 42, a first fuel supply device 44, a second fuel supply device 46, an intake passage 48, an air cleaner 50, a regulator 54, and a solenoid valve 56.

  An air cleaner 50 is provided on one end side of the intake passage 48 for removing foreign matter in the drawn air. At the other end of the intake passage 48, an intake manifold 40 is connected which branches the intake passage to the intake port of each cylinder. A first fuel supply device 44 is provided at a predetermined position between the air cleaner 50 and the other end of the intake passage 48. Further, a second fuel supply device 46 is provided in the intake passage 48 at a predetermined position closer to the engine body 10 than the first fuel supply device 44. A throttle 42 is provided in the intake passage 48 at a predetermined position between the first fuel supply device 44 and the second fuel supply device 46.

  Solenoid valve 56 operates based on a control signal from engine ECU 200. The solenoid valve 56 is controlled to be open when the engine 1 is operating and to be closed when the engine 1 is stopped. When the solenoid valve 56 is open, the city gas supplied from the external fuel supply source is supplied to the regulator 54 via the solenoid valve 56.

  The regulator 54 regulates the pressure of the fuel supplied from the fuel supply source. The fuel whose pressure is adjusted in the regulator 54 is supplied to the first fuel supply device 44 and the second fuel supply device 46.

  First fuel supply device 44 includes an adjustment device that adjusts the amount of supplied fuel based on a control signal of engine ECU 200. The adjusting device adjusts the amount of fuel supplied, for example, by adjusting the cross-sectional area (opening degree) of the fuel flow path. As the adjusting device, for example, a control valve whose opening degree can be changed using a step motor is used.

  The second fuel supply device 46 includes an injector that injects the fuel whose pressure is adjusted by the regulator 54 into the intake passage 48. The second fuel supply device 46 adjusts the fuel supply amount based on the control signal of the engine ECU 200.

  The throttle 42 adjusts the flow rate of gas flowing in the intake passage 48 based on a control signal of the engine ECU 200. The throttle 42 includes, for example, a throttle valve whose opening degree can be changed using a throttle motor.

  The gaseous fuel supplied into the intake passage 48 via the first fuel supply device 44 or the second fuel supply device 46 is mixed with the air taken in from the air cleaner 50 to form an air-fuel mixture. The formed mixture is supplied to the engine body 10 via the intake manifold.

  The engine body 10 includes a plurality of cylinders 11, a plurality of ignition coils 12, cylinder deactivation devices 14 and 16, a variable valve timing device 17, a built-in oil pump 18, and an external oil pump 20.

  In the present embodiment, the engine body 10 will be described as being provided with four cylinders 11. Inside the cylinder 11, a piston (not shown) is slidably accommodated along the inner circumferential surface of the cylinder 11. In the intake stroke, when the piston descends in the cylinder 11, the pressure in the cylinder decreases, and the air-fuel mixture is introduced from the intake manifold 40. In the compression stroke, as the piston ascends in the cylinder 11, the mixture in the cylinder 11 is compressed. When the piston is ignited by the ignition coil 12 in the vicinity of the rise to the top dead center, the compressed mixture in the cylinder 11 burns. In the expansion stroke, the combustion pressure of the mixture depresses the piston, and the crankshaft (output shaft) of the engine body 10 is rotated via the crank mechanism. Then, in the exhaust stroke, the exhaust in the cylinder 11 is discharged to the exhaust manifold 70 by raising the piston.

  The cylinder deactivation devices 14 and 16 are configured to be able to deactivate any two cylinders 11 of the plurality of cylinders 11 respectively. The cylinder deactivation device 14 includes a lifter 14 a and an OSV (Oil Switching Valve) 14 b. The cylinder deactivation device 16 includes a lifter 16a and an OSV 16b.

  The lifters 14a and 16a normally transmit the force transmitted by the rotation of the cam to the intake valve and the exhaust valve when converting the rotational operation of the cam to the opening and closing operation of the intake valve and the exhaust valve. On the other hand, the lifters 14a and 16a do not transmit the force transmitted by the rotation of the cam to the intake valve and the exhaust valve when the cylinder is at rest. Therefore, at the time of cylinder deactivation, in the cylinders provided with the cylinder deactivation devices 14 and 16, the opening and closing operations of the intake valve and the exhaust valve are not performed.

  The OSVs 14 b and 16 b are changed to either one of the open state and the closed state according to the control signal of the engine ECU 200. When the OSVs 14b and 16b are open, the hydraulic pressure generated in at least one of the built-in oil pump 18 and the external oil pump 20 is supplied to the lifters 14a and 16a. In this case, the lifters 14a and 16b do not transmit the force transmitted by the rotation of the cam to the intake valve and the exhaust valve when the hydraulic pressure is supplied.

  On the other hand, when the OSVs 14b and 16b are in the closed state, the hydraulic pressure generated in at least one of the built-in oil pump 18 and the external oil pump 20 is not supplied to the lifters 14a and 16a. In this case, the lifters 14a and 16b do not transmit the force transmitted by the rotation of the cam to the intake valve and the exhaust valve by stopping the supply of the hydraulic pressure.

  The OSVs 14 b and 16 are opened in response to the operation command from the engine ECU 200 and are closed in response to the operation stop command from the engine ECU 200.

  The built-in oil pump 18 is, for example, a mechanical oil pump that uses the engine 1 as a power source, and generates an oil pressure according to the engine speed. Specifically, the discharge amount of built-in oil pump 18 increases as the engine rotational speed increases (the generated hydraulic pressure increases), and the discharge amount decreases as the engine rotational speed decreases (the generated hydraulic pressure decreases) To work. The built-in oil pump 18 is configured to be capable of supplying hydraulic pressure to each of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17.

  The external oil pump 20 is, for example, an electric oil pump, and operates or stops operation in accordance with a control signal from the engine ECU 200. The external oil pump 20 is connected in parallel with the built-in oil pump 18 to the hydraulic pressure supply destinations (the cylinder deactivation devices 14 and 16 and the variable valve timing device 17). Therefore, the external oil pump 20 is also configured to be able to supply hydraulic pressure to each of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 as with the built-in oil pump 18.

  Variable valve timing device 17 is configured to be able to change the operating characteristics (for example, open / close timing) of the intake valve and the exhaust valve in accordance with a control signal from engine ECU 200. The variable valve timing device 17 changes the open / close timing of the intake valve and the exhaust valve with respect to the rotational position (crank angle) of the crankshaft. The variable valve timing device 17 includes, for example, an intake hydraulic actuator 17 a, an exhaust hydraulic actuator 17 b, and an OCV (Oil Control Valve) 17 c.

  Although not shown, the engine body 10 further includes a camshaft and a cam sprocket. The camshaft is configured to synchronize with the rotation of the crankshaft. The camshaft includes an exhaust side camshaft for opening and closing an exhaust valve provided in each cylinder, and an intake side camshaft for opening and closing an intake valve provided in each cylinder. On the exhaust side camshaft, a plurality of cams for opening and closing the exhaust valve are fixed at predetermined intervals. A plurality of cams for opening and closing the intake valve are fixed to the intake side camshaft at predetermined intervals.

  A cam sprocket is provided at one end of each of the intake and exhaust camshafts. The same timing chain is wound around both cam sprockets. The timing chain is also wound around a timing rotor provided on the crankshaft. With such a configuration, the crankshaft and the camshaft rotate synchronously by the timing chain.

  An intake hydraulic actuator 17a is provided between the intake camshaft and the cam sprocket. The intake hydraulic actuator 17a changes the rotational phase between the intake camshaft and the cam sprocket. In addition, an exhaust hydraulic actuator 17b is also provided between the exhaust camshaft and the cam sprocket. The exhaust hydraulic actuator 17b changes the rotational phase between the exhaust camshaft and the cam sprocket. The intake hydraulic actuator 17a and the exhaust hydraulic actuator 17b operate using the hydraulic pressure supplied from the built-in oil pump 18 or the external oil pump 20 via the OCV 17c. The OCV 17 c adjusts the hydraulic pressure supplied from the built-in oil pump 18 or the external oil pump 20 according to a control signal from the engine ECU 200.

  When the rotational phase of the camshaft on the intake side and the cam sprocket is changed by the intake hydraulic actuator 17a, the valve opening period is maintained and the valve opening timing and the valve closing timing are changed in the intake valve. That is, the valve position of the intake valve with respect to the rotational position of the crankshaft changes. Similarly, in the exhaust valve, when the exhaust side hydraulic actuator 17b changes the rotational phase of the camshaft and the cam sprocket on the exhaust side, the valve opening period is maintained, and the valve opening timing and the valve closing timing are Change.

  The exhaust system 4 includes an exhaust manifold 70, an exhaust passage 72, an exhaust purification device 74, and a muffler 76.

  The exhaust manifold 70 is connected to the exhaust port of each cylinder of the engine body 10. Further, one end of an exhaust passage 72 is connected to the exhaust manifold 70. In the middle of the exhaust passage 72, an exhaust purification device 74 and a muffler 76 are provided at predetermined positions.

  The exhaust gas purification device 74 may be various catalysts, and may include, for example, hydrocarbons in exhaust gas, carbon monoxide, and a three-way catalyst having a function of purifying nitrogen oxides. The exhaust gas discharged from the exhaust manifold 70 is discharged to the outside via the exhaust gas purification device 74 and the muffler 76.

  Although not shown, engine ECU 200 is configured to include a central processing unit (CPU), a memory, and an input / output buffer. The engine ECU 200 controls various devices such that the engine 1 is in a desired operating state, based on signals from various sensors and devices described later and maps and programs stored in the memory. The various controls are not limited to software processing, and may be processed by dedicated hardware (electronic circuits).

  Engine ECU 200 sets, for example, the amount of fuel supplied by first fuel supply device 44 and the amount of fuel supplied by second fuel supply device 46 based on the required torque for engine 1, according to each set supply amount. , And controls the first fuel supply device 44 and the second fuel supply device 46. When engine 1 is used as a power source of gas heat pump, engine ECU 200 sets the required torque for engine 1 based on, for example, the difference between the set temperature set in the air conditioner and the current temperature. It is also good.

The engine ECU 200, the intake air temperature sensor 100, an intake pressure sensor 102, a water temperature sensor 104, a crank angle sensor 106, the cam angle sensor 108, and the _{O 2} sensor 110 is connected.

  The intake air temperature sensor 100 detects the temperature of the intake air flowing in the intake passage 48 (hereinafter referred to as the intake air temperature). Intake air temperature sensor 100 transmits a signal indicating the detected intake air temperature to engine ECU 200.

  The intake pressure sensor 102 detects the pressure of intake air in the intake manifold 70 (hereinafter referred to as the intake pressure). The intake pressure sensor 102 transmits a signal indicating the detected intake pressure to the engine ECU 200.

  The water temperature sensor 104 detects the temperature (hereinafter, described as water temperature) of the cooling water in a passage (hereinafter, described as a cooling water passage) which circulates the cooling water. The coolant passage is provided, for example, inside the engine body 10. Water temperature sensor 104 transmits a signal indicating the detected water temperature to engine ECU 200.

  The crank angle sensor 106 detects a crank angle. Crank angle sensor 106 transmits a signal indicating the detected crank angle to engine ECU 200.

  The cam angle sensor 108 detects a rotational angle of the camshaft (hereinafter referred to as a cam angle). The cam angle sensor 108 transmits a signal indicating the detected cam angle to the engine ECU 200.

The O ₂ sensor 110 detects the oxygen concentration in the exhaust gas. The O ₂ sensor 110 transmits a signal indicating the detected oxygen concentration to the engine ECU 200.

  In the engine 1 provided with an accessory that operates using oil pressure such as the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 as described above, the external oil pump 20 is predetermined especially with a low engine speed. The cylinder deactivation devices 14 and 16 and the variable valve timing device 17 are provided to ensure the hydraulic pressure that can operate in the rotational speed range.

  When such an abnormality occurs in the external oil pump 20, the cylinder deactivation devices 14 and 16, the variable valve timing device 17 and the like can not be properly operated. It is required to detect with high accuracy. For example, it is conceivable to detect an abnormality with high accuracy by newly providing various sensors such as a hydraulic pressure sensor to the external oil pump 20, but there is a possibility that the manufacturing cost may increase.

  Therefore, in the present embodiment, engine ECU 200 instructs cylinder deactivation devices 14 and 16 and variable valve timing device 17 to operate within the engine rotation speed range in which the engine rotation speed is predetermined. If the operation state of at least one of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 is not the operation state corresponding to the control command to the external oil pump 20, the external oil pump 20 is in an abnormal state. It shall be determined that

  FIG. 2 is a diagram for explaining the operating states of the external oil pump 20, the cylinder deactivation devices 14 and 16, and the variable valve timing device 17 when the external oil pump 20 is normal and abnormal.

  For example, when the external oil pump 20 is commanded to stop operation (oil pump OFF) as shown in FIG. 2A when the external oil pump 20 is normal, the external oil pump 20 is stopped become. At this time, in the low rotation region where the engine rotation speed is low, the hydraulic pressure supplied by the built-in oil pump 18 is low, and both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 can not operate. On the other hand, in the high engine speed range where the engine speed is high, the hydraulic pressure supplied by the built-in oil pump 18 is high, and the external cylinder pump 20 is stopped. Both are ready for operation.

  When the external oil pump 20 is instructed to operate (oil pump ON) as shown in FIG. 2B when the external oil pump 20 is normal, the external oil pump 20 is activated. At this time, in the low rotation region, even if the oil pressure supplied by the built-in oil pump 18 is low, both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 can be operated by operating the external oil pump 20. It becomes a state. On the other hand, in the high rotation region, as described above, the hydraulic pressure supplied by the built-in oil pump 18 is high, and both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 become operable.

  When a break occurs in the electric circuit of the external oil pump 20, or when the operating point of the external oil pump 20 is fixed, or a foreign object bites, a closing abnormality occurs in which the hydraulic pressure does not increase even if the operating command is issued There is.

  When the external oil pump 20 is commanded to stop operating as shown in FIG. 2C when such an external oil pump 20 is closed abnormally, the cylinder deactivation devices 14 and 16 and the variable valve are operated. The state of the timing device 17 is the same as the state shown in FIG. Therefore, the detailed description will not be repeated.

  On the other hand, when the external oil pump 20 is operated abnormally as shown in FIG. 2D when the external oil pump 20 is closed abnormally, when the external oil pump 20 is instructed to operate, the external oil pump 20 is stopped. At this time, in the low rotation region, the hydraulic pressure supplied by the built-in oil pump 18 is low, and both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 can not operate. On the other hand, in the high rotation region, the hydraulic pressure supplied by the built-in oil pump 18 is high, and both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 become operable.

  Furthermore, when the energization state of the electric circuit can not be cut off due to a failure or the like of the switch circuit included in the electric circuit of the external oil pump 20, an open abnormality may occur in which the hydraulic pressure is not reduced even if the operation stop is commanded.

  When the external oil pump 20 is commanded to stop operating as shown in (E) of FIG. 2 at the time of such an open abnormality of the external oil pump 20, the external oil pump 20 is in the operating state. Become. At this time, in the low rotation region, by operating the external oil pump 20, both the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 become operable.

  On the other hand, when the external oil pump 20 is commanded to operate as shown in (F) of FIG. 2 when the external oil pump 20 has an open abnormality, the cylinder deactivation devices 14 and 16 and the variable valve timing device The state of 17 is the same as the state shown in FIG. Therefore, the detailed description will not be repeated.

  In view of the operating states of the external oil pump 20, the cylinder deactivation devices 14 and 16, and the variable valve timing device 17 (particularly, the operating states in the thick frame in FIG. 2) when the external oil pump 20 is normal and abnormal. In the present embodiment, engine ECU 200 is within the engine speed range in which the engine speed is predetermined (the low engine speed range where engine speed is less than or equal to the threshold) and cylinder deactivation devices 14 and 16. When commanding each of the variable valve timing device 17 and the external oil pump 20 to operate, when both of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 are in the inoperative state, the external oil pump 20 It is determined that a closed abnormality state in which the generated oil pressure does not increase is determined.

  Further, engine ECU 200 instructs operation to each of cylinder deactivation devices 14 and 16 and variable valve timing device 17 within an engine rotation speed range in which the engine rotation speed is predetermined, and external oil pump 20. If the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 are both in the operation state when commanding to the operation stop, it is determined that the oil pressure generated in the external oil pump 20 does not decrease. It shall be.

  In this way, it is possible to accurately determine whether the external oil pump 20 has a closed abnormality or an open abnormality.

<About closed abnormality detection processing>
Hereinafter, with reference to FIG. 3, a closing abnormality detection process for detecting closing abnormality of the external oil pump 20, which is executed by the engine ECU 200 in the present embodiment, will be described. FIG. 3 is a flowchart showing a closing abnormality detection process for detecting the closing abnormality of the external oil pump 20. Engine ECU 200 executes the closed abnormality detection process shown in FIG. 3 each time a predetermined time has elapsed. Each step shown in the flowchart shown in FIG. 3 is realized by software processing by engine ECU 200, but a part of the steps may be realized by hardware (electric circuit) manufactured in engine ECU 200.

  In step (hereinafter, step will be referred to as S) 100, engine ECU 200 determines whether or not the precondition is satisfied. The preconditions include, for example, a condition that warm-up of the engine 1 is completed and a condition that a predetermined time has elapsed since the engine 1 was started. For example, when the water temperature of engine 1 is higher than the threshold value, engine ECU 200 determines that the condition where engine warm-up is completed is satisfied. If it is determined that the precondition is satisfied (YES in S100), the process proceeds to S102.

  At S102, engine ECU 200 determines whether or not cylinder deactivation devices 14 and 16 have no abnormality. Engine ECU 200 determines that cylinder deactivation devices 14 and 16 have no abnormality when, for example, the flag that is turned on when abnormality of cylinder deactivation devices 14 and 16 occurs is in the OFF state. It should be noted that as a method of determining whether or not there is an abnormality in the cylinder deactivation devices 14 and 16, a known technique may be used, and the detailed description will not be given. If it is determined that the cylinder deactivation devices 14 and 16 are in the state of no abnormality (YES in S102), the process proceeds to S104.

  In S104, engine ECU 200 determines whether variable valve timing device 17 is in a state of no abnormality. Engine ECU 200 determines that variable valve timing device 17 is in a non-abnormal state, for example, when a flag that is turned on when abnormality of variable valve timing device 17 occurs is in an off state. As a method of determining whether or not there is an abnormality in the variable valve timing device 17, a known technique may be used, and the detailed description will not be made. If it is determined that variable valve timing device 17 is in the state of no abnormality (YES in S104), the process proceeds to S106.

  At S106, engine ECU 200 determines whether an abnormality detection condition for closing abnormality is satisfied. The abnormality detection conditions include, for example, a condition that the engine rotation speed is within a predetermined rotation speed region equal to or less than a threshold value, and a condition that an open abnormality abnormality detection process described later is not being executed. The threshold value of the engine rotational speed is set based on, for example, an engine rotational speed lower than the hydraulic pressure at which the hydraulic pressure generated in the built-in oil pump 18 enables the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 to operate. Ru. If it is determined that the abnormality detection condition is satisfied (YES in S106), the process proceeds to S108.

  At S108, engine ECU 200 instructs the operation of external oil pump 20. Specifically, engine ECU 200 outputs an operation command to the drive circuit of external oil pump 20 so that electric power is supplied to the pump motor, for example.

  At S110, engine ECU 200 instructs operation of variable valve timing device 17. Specifically, engine ECU 200 is predetermined, for example, until the operating angle of variable valve timing device 17 (the amount of phase shift between the rotation of the camshaft and the rotation of the crankshaft) reaches a predetermined amount A. Control the OCV 17c to change in speed.

  In S112, engine ECU 200 determines whether the actual operating angle in variable valve timing device 17 follows the operating angle corresponding to the operating command (hereinafter referred to as the command operating angle). For example, when the magnitude of the difference between the actual operating angle of variable valve timing device 17 and the commanded operating angle is equal to or less than the threshold value, engine ECU 200 follows the actual operating angle of variable valve timing device 17 following the commanded operating angle. It is determined that there is. Engine ECU 200 calculates the actual operating angle based on, for example, the phase of the crank angle and the cam angle. Engine ECU 200 calculates a command actuation angle based on, for example, a control value for OCV 17c. If it is determined that the actual operating angle of variable valve timing device 17 does not follow the command operating angle (NO in S112), the process proceeds to S114.

  In S114, engine ECU 200 turns on the abnormality flag of variable valve timing device 17, and shifts the process to S116. For example, engine ECU 200 turns on the abnormality flag of variable valve timing device 17 after a predetermined time has elapsed from the determination time point whether the actual operating angle follows the commanded operating angle.

  If it is determined that the actual operating angle of variable valve timing device 17 follows the commanded operating angle (YES in S112), the process proceeds to S116.

  At S116, engine ECU 200 instructs the operation of cylinder deactivation devices 14 and 16. Specifically, engine ECU 200 controls OSVs 14 b and 16 b to be in the open state. Engine ECU 200 instructs, for example, the operation of cylinder deactivation devices 14 and 16 after a predetermined time has elapsed from the determination of whether the actual operating angle of variable valve timing device 17 follows the commanded operating angle. .

  At S118, engine ECU 200 determines whether cylinder deactivation devices 14 and 16 are operating. Engine ECU 200 determines that cylinder deactivation devices 14 and 16 are in operation, for example, when the amount of intake air increases above a threshold value due to cylinder deactivation. If it is determined that the cylinder deactivation devices 14 and 16 are not in operation (NO in S118), the process proceeds to S120.

  In S120, engine ECU 200 turns on the abnormality flag of cylinder deactivation device 14, 16, and shifts the process to S122. For example, engine ECU 200 turns on the abnormality flag of cylinder deactivation devices 14 and 16 after a predetermined time has elapsed from the determination of whether cylinder deactivation devices 14 and 16 are operating.

  If it is determined that cylinder deactivation devices 14 and 16 are operating (YES in S118), the process proceeds to S122.

  In S122, engine ECU 200 determines whether or not cylinder deactivation devices 14 and 16 and variable valve timing device 17 are both in an abnormal state. For example, when the abnormality flag of each of the cylinder deactivation devices 14 and 16 is in the on state and the abnormality flag of the variable valve timing device 17 is in the on state, the engine ECU 200 controls the cylinder deactivation devices 14 and 16 and the variable valve timing. It is determined that all the devices 17 are in an abnormal state. If it is determined that both cylinder deactivation devices 14 and 16 and variable valve timing device 17 are in an abnormal state (YES in S122), the process proceeds to S124.

  In S124, engine ECU 200 turns on the close abnormality flag indicating that external oil pump 20 is in the close abnormality state. Engine ECU 200 turns on the closing abnormality flag, for example, after a predetermined time has elapsed from the time of determining whether or not cylinder deactivation devices 14 and 16 and variable valve timing device 17 are both in the abnormal state. . For example, engine ECU 200 may notify the user that external oil pump 20 is in the abnormal closing state, while setting the closed abnormality flag to the ON state.

  In S126, engine ECU 200 turns off the abnormality flag of variable valve timing device 17 and cylinder deactivation device 14, 16.

  At S128, engine ECU 200 determines whether or not cylinder deactivation devices 14 and 16 and variable valve timing device 17 are all in a normal state. For example, when the abnormality flag of each of the cylinder deactivation devices 14 and 16 is in the OFF state and the abnormality flag of the variable valve timing device 17 is in the OFF state, the engine ECU 200 controls the cylinder deactivation devices 14 and 16 and the variable valve timing. It is determined that all the devices 17 are in the normal state. If it is determined that both cylinder deactivation devices 14 and 16 and variable valve timing device 17 are in the normal state (YES at S128), the process proceeds to S130.

  At S130, engine ECU 200 turns on the normal flag of external oil pump 20. If it is determined that one of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 is in the normal state and the other is in the abnormal state (NO in S128), the process proceeds to S132. Be

  At S132, engine ECU 200 executes a process of counting up the number of temporary abnormality determinations. The temporary abnormality determination number has an initial value of zero. At the time of count-up processing, engine ECU 200 acquires a value indicating the number of temporary abnormality determinations from the memory, adds 1 to the acquired value, and updates the number of temporary abnormality determinations using the added value.

  In S134, engine ECU 200 determines whether the value indicating the number of temporary abnormality determinations is equal to or less than a threshold. As the threshold value, for example, a predetermined value such as twice or several times is set. If it is determined that the value indicating the number of temporary abnormality determinations is equal to or less than the threshold (YES in S134), this process is ended. On the other hand, if the value indicating the number of temporary abnormality determinations is larger than the threshold (NO in S134), the process proceeds to S124.

<About open abnormality detection processing>
Next, with reference to FIG. 4, an open abnormality detection process for detecting an open abnormality of the external oil pump 20, which is executed by the engine ECU 200 in the present embodiment, will be described. FIG. 4 is a flowchart showing an open abnormality detection process for detecting an open abnormality of the external oil pump 20. Engine ECU 200 executes the open abnormality detection process shown in FIG. 4 each time a predetermined time elapses. Although each step shown in the flowchart shown in FIG. 4 is realized by software processing by engine ECU 200, a part of the steps may be realized by hardware (electric circuit) manufactured in engine ECU 200.

  At S200, engine ECU 200 determines whether the precondition is satisfied. The precondition is the same as the precondition used in the process of S100 shown in FIG. 3 described above, and thus the detailed description thereof will not be repeated. If it is determined that the precondition is satisfied (YES in S200), the process proceeds to S202.

  At S202, engine ECU 200 determines whether or not cylinder deactivation devices 14 and 16 have no abnormality. The process is similar to the process of S102 shown in FIG. 3 described above, and thus the detailed description thereof will not be repeated. If it is determined that the cylinder deactivation devices 14 and 16 are in the state of no abnormality (YES in S202), the process proceeds to S204.

  At S204, engine ECU 200 determines whether or not variable valve timing device 17 is in a state of no abnormality. Since this process is the same process as the process of S104 shown in FIG. 3 described above, the detailed description thereof will not be repeated. If it is determined that variable valve timing device 17 is in the state of no abnormality (YES in S204), the process proceeds to S206.

  In S206, engine ECU 200 determines whether or not an abnormality detection condition for open abnormality is satisfied. The abnormality detection condition includes, for example, a condition that the engine rotation speed is within a predetermined rotation speed region equal to or less than a threshold, and a condition that the above-described abnormality detection process for closing abnormality is not being executed. The threshold value of the engine rotational speed is set based on, for example, an engine rotational speed lower than the hydraulic pressure at which the hydraulic pressure generated in the built-in oil pump 18 enables the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 to operate. Ru. If it is determined that the abnormality detection condition is satisfied (YES in S206), the process proceeds to S208.

  At S208, engine ECU 200 instructs the operation stop of external oil pump 20. Specifically, engine ECU 200 outputs a stop command to the drive circuit of external oil pump 20 so that the power supply to the pump motor is stopped, for example.

  At S210, engine ECU 200 instructs operation of variable valve timing device 17. Since this process is the same process as the process of S110 shown in FIG. 3, the detailed description thereof will not be repeated.

  In S212, engine ECU 200 determines whether the actual operating angle in variable valve timing device 17 follows the commanded operating angle. For example, when the magnitude of the difference between the actual operating angle of variable valve timing device 17 and the commanded operating angle is equal to or less than the threshold, engine ECU 200 follows the actual operating angle of variable valve timing device 17 following the commanded operating angle. It is determined that there is. If it is determined that the actual operating angle of variable valve timing device 17 follows the commanded operating angle (YES in S212), the process proceeds to S214.

  In S214, engine ECU 200 turns on the follow-up abnormality flag of variable valve timing device 17, and shifts the process to S216. For example, engine ECU 200 turns on the following abnormality flag of variable valve timing device 17 after a predetermined time has elapsed from the determination time point whether the actual operating angle follows the command operating angle.

  If it is determined that the actual operating angle of variable valve timing device 17 does not follow the command operating angle (NO in S112), the process proceeds to S216.

  At S216, engine ECU 200 commands operation of cylinder deactivation devices 14 and 16. Since this process is the same as the process of S116 shown in FIG. 3, the detailed description thereof will not be repeated.

  At S218, engine ECU 200 determines whether cylinder deactivation devices 14 and 16 are operating. If it is determined that cylinder deactivation devices 14 and 16 are operating (YES in S218), the process proceeds to S220.

  At S220, engine ECU 200 turns on the following abnormality flag of cylinder deactivation device 14, 16, and shifts the process to S222. For example, engine ECU 200 turns on the abnormality flag of cylinder deactivation devices 14 and 16 after a predetermined time has elapsed from the determination of whether cylinder deactivation devices 14 and 16 are operating.

  If it is determined that cylinder deactivation devices 14 and 16 are not operating (NO in S218), the process proceeds to S222.

  At S222, engine ECU 200 determines whether or not cylinder deactivation devices 14 and 16 and variable valve timing device 17 are both in the follow-up abnormal state. For example, when the follow-up abnormality flag of each of the cylinder deactivation devices 14 and 16 is in the on state and the follow-up abnormality flag of the variable valve timing device 17 is in the on state, the engine ECU 200 It is determined that all the valve timing devices 17 are in the following abnormal state. If it is determined that cylinder deactivation devices 14 and 16 and variable valve timing device 17 are both in the follow-up abnormal state (YES in S222), the process proceeds to S224.

  At S224, engine ECU 200 turns on the open abnormality flag indicating that external oil pump 20 is in the open abnormality state. For example, engine ECU 200 sets the open abnormality flag to the on state after a predetermined time has elapsed from the time point when it is determined whether cylinder deactivation devices 14 and 16 and variable valve timing device 17 are both in the following abnormal state. Do. For example, engine ECU 200 may notify the user that external oil pump 20 is in the open abnormality state while turning the open abnormality flag on.

  At S226, engine ECU 200 turns off the follow-up abnormality flag of variable valve timing device 17 and cylinder deactivation device 14 or 16.

  At S228, engine ECU 200 determines whether variable valve timing device 17 and variable valve timing device 17 are both in a normal state. For example, when the follow-up abnormality flag of each of the cylinder deactivation devices 14 and 16 is in the OFF state and the follow-up abnormality flag of the variable valve timing device 17 is in the OFF state, the engine ECU 200 It is determined that all the valve timing devices 17 are in the normal state. If it is determined that both cylinder deactivation devices 14 and 16 and variable valve timing device 17 are in the normal state (YES in S228), the process proceeds to S230.

  At S230, engine ECU 200 turns on the normal flag of external oil pump 20. If it is determined that one of cylinder deactivation devices 14 and 16 and variable valve timing device 17 is in the normal state and the other is in the following abnormal state (NO in S228), the process proceeds to S232. Be transferred.

  At S132, engine ECU 200 executes a process of counting up the number of temporary abnormality determinations. This process is the same process as the process of S132 shown in FIG. 3, and thus the detailed description thereof will not be repeated.

  In S234, engine ECU 200 determines whether the value indicating the number of temporary abnormality determinations is equal to or less than a threshold. If it is determined that the value indicating the number of temporary abnormality determinations is equal to or less than the threshold (YES in S234), this process is ended. On the other hand, if the value indicating the number of temporary abnormality determinations is larger than the threshold (NO in S234), the process proceeds to S224.

  The operation of engine ECU 200 in the present embodiment based on the above-described structure and flowchart will be described.

<At the time of closing abnormality of external oil pump 20>
The operation of the engine 1 at the time of execution of the closing abnormality detection process when the external oil pump 20 is in the closing abnormality state will be described below with reference to FIG. FIG. 5 is a timing chart for explaining the operation of the engine 1 at the time of execution of the closed abnormality detection process.

  LN1 of FIG. 5 shows a change of the command operation angle of the variable valve timing device 17. LN 2 in FIG. 5 shows the change of the actual operating angle of the variable valve timing device 17. LN 3 in FIG. 5 shows the change of the abnormality flag of the variable valve timing device 17. LN 4 in FIG. 5 shows the change of the operation command of the cylinder deactivation device 14, 16. LN 5 in FIG. 5 shows a change in the actual operating state of the cylinder deactivation device 14, 16. LN 6 in FIG. 5 shows the change of the abnormality flag of the cylinder deactivation device 14, 16. LN 7 in FIG. 5 shows the change of the operation command to the external oil pump 20. LN 8 in FIG. 5 shows a change in the actual operating state of the external oil pump 20. LN 9 in FIG. 5 shows the change of the close abnormality flag of the external oil pump 20.

  For example, the precondition is satisfied (YES in S100), variable valve timing device 17 is in a non-abnormal state (YES in S102), and cylinder deactivation devices 14 and 16 are in a non-abnormal state. A case (YES in S104) is assumed.

  When the abnormality detection condition for the close abnormality is satisfied at time t (0) (YES in S106), the external oil pump 20 is instructed to operate (S108). As indicated by LN7 in FIG. 5, since the operation of the external oil pump 20 is commanded (ON state) in a period before time t (0), in this case, the operation is commanded. Will be continued.

  At this time, the variable valve timing device 17 is instructed to operate (S110). Therefore, as shown by LN1 in FIG. 5, after time t (0), the commanded operating angle of variable valve timing device 17 increases with the passage of time, and at time t (1), the commanded operating angle becomes Reach A, then be maintained.

  When the external oil pump 20 is in the abnormal closing state, as shown by LN 7 and LN 8 in FIG. 5, although the operation command is in the on state, the state is not actually operating. Therefore, the hydraulic pressure required for the operation of the variable valve timing device 17 is not supplied, so that the actual operating angle of the variable valve timing device 17 is maintained at zero as shown in LN 2 of FIG. 5.

  When it is determined that the actual operating angle does not follow the command operating angle because the magnitude of the difference between the actual operating angle and the command operating angle is equal to or greater than the threshold (NO in S112), time t (2) Then, as shown in LN3 of FIG. 5, the abnormality flag of the variable valve timing device 17 is turned on (S114).

  At time t (3), as shown by LN 4 in FIG. 5, the operation is commanded to the cylinder deactivation device 14, 16 (S116). Therefore, the OSVs 14 b and 16 b are in the open state. When the external oil pump 20 is in the abnormal closing state, the oil pressure required for the operation of the cylinder deactivation device 14, 16 is not supplied, so that the cylinder deactivation device 14, 16 is deactivated as shown in LN 5 of FIG. 5. (A state in which four-cylinder operation does not shift to two-cylinder operation).

  As a result, it is determined that the cylinder deactivation device 14 or 16 is not operating (NO in S118), so that the cylinder deactivation device 14 or 16 malfunctions at time t (4) as shown in LN 6 of FIG. The flag is turned on (S120).

  Since the abnormality flag of the cylinder deactivation device 14 or 16 is in the on state and the abnormality flag of the variable valve timing device 17 is in the on state (YES in S122), at time t (5), FIG. As shown in LN 9, the close abnormality flag of the external oil pump 20 is turned on (S124). Further, both the abnormality flag of the variable valve timing device 17 and the abnormality flag of the cylinder deactivation device 14, 16 are turned off (S126).

<At opening error of external oil pump 20>
Hereinafter, the operation of the engine 1 at the time of execution of the opening abnormality detection process when the external oil pump 20 is in the opening abnormality state will be described with reference to FIG. FIG. 6 is a timing chart (part 1) for explaining the operation of the engine 1 when the open abnormality detection process is performed.

  LN 11 in FIG. 6 shows the change of the command operating angle of the variable valve timing device 17. LN 12 in FIG. 6 shows the change of the actual operating angle of the variable valve timing device 17. LN 13 in FIG. 6 shows the change of the follow-up abnormality flag of the variable valve timing device 17. LN 14 in FIG. 6 shows the change of the operation command of the cylinder deactivation device 14, 16. LN 15 in FIG. 6 shows changes in the actual operating state of the cylinder deactivation devices 14 and 16. LN 16 in FIG. 6 shows a change in the following abnormality flag of the cylinder deactivation device 14, 16. LN 17 in FIG. 6 shows the change of the operation command to the external oil pump 20. LN 18 in FIG. 6 shows a change in the actual operating state of the external oil pump 20. LN 19 in FIG. 6 indicates a change in the normal flag of the external oil pump 20. LN 20 in FIG. 6 shows a change in the open abnormality flag of the external oil pump 20.

  For example, the precondition is satisfied (YES in S200), variable valve timing device 17 is in a non-abnormal state (YES in S202), and cylinder deactivation devices 14 and 16 are in a non-abnormal state. A case is assumed (YES in S204).

  When the abnormality detection condition for open abnormality is satisfied at time t (10) (YES in S206), the operation is commanded to external oil pump 20 (S208). As shown in LN 17 in FIG. 6, the operation of external oil pump 20 is not commanded in the period prior to time t (10) (off state), and in this case, the state in which the operation is not commanded continues It will be done.

  At this time, the variable valve timing device 17 is instructed to operate (S210). Therefore, as shown by LN 11 in FIG. 6, after time t (10), the commanded operating angle of variable valve timing device 17 increases with the passage of time, and at time t (11), the commanded operating angle becomes Reach A, then be maintained.

  When the external oil pump 20 is in the open abnormality state, as shown by LN 17 and LN 18 in FIG. 6, although the operation command is in the OFF state, it is in the state of actually operating. Therefore, when the hydraulic pressure required for the operation of the variable valve timing device 17 is supplied, as shown by LN 12 in FIG. 6, the actual operating angle of the variable valve timing device 17 follows the commanded operating angle.

  When it is determined that the actual operating angle follows the commanded operating angle because the magnitude of the difference between the actual operating angle and the commanded operating angle is smaller than the threshold (YES in S212), time t (12) Then, as indicated by LN 13 in FIG. 6, the following abnormality flag of the variable valve timing device 17 is turned on (S214).

  At time t (13), as shown in LN 14 of FIG. 6, the operation is commanded to the cylinder deactivation device 14, 16 (S216). Therefore, the OSVs 14 b and 16 b are in the open state. When the external oil pump 20 is in the open abnormality state, the cylinder deactivation device 14 or 16 operates as shown by LN 15 in FIG. 6 by supplying the hydraulic pressure required for the operation of the cylinder deactivation device 14 or 16. It will be in the state (the state where it has shifted from 4 cylinder operation to 2 cylinder operation).

  As a result, it is determined that the cylinder deactivation device 14 or 16 is in operation (YES in S218), and at time t (14), the cylinder deactivation device 14 or 16 follows as indicated by LN 16 in FIG. The abnormal flag is turned on (S220).

  Since the follow-up abnormality flag of the variable valve timing device 17 is in the on state and the follow-up abnormality flag of the cylinder deactivation device 14 or 16 is in the on state (YES in S222), time t (15) As shown in LN 20 of 6, the open abnormality flag of the external oil pump 20 is turned on (S224). Further, the follow-up abnormality flag of the variable valve timing device 17 and the follow-up abnormality flag of the cylinder deactivation device 14, 16 are both turned off (S226). The normal flag of the external oil pump 20 maintains the off state as shown by LN 19 in FIG.

<When the external oil pump 20 is normal>
Hereinafter, the operation of the engine 1 at the time of execution of the open abnormality detection process when the external oil pump 20 is in the normal state will be described with reference to FIG. FIG. 7 is a timing chart (No. 2) for explaining the operation of the engine 1 when the open abnormality detection process is executed.

  LN 21 in FIG. 7 shows the change of the command operating angle of the variable valve timing device 17. LN 22 in FIG. 7 shows the change of the actual operating angle of the variable valve timing device 17. LN 23 in FIG. 7 shows the change of the follow-up abnormality flag of the variable valve timing device 17. LN 24 in FIG. 7 shows the change of the operation command of the cylinder deactivation device 14, 16. LN 25 in FIG. 7 shows a change in the actual operating state of the cylinder deactivation device 14, 16. LN 26 in FIG. 7 shows a change in the following abnormality flag of the cylinder deactivation device 14, 16. LN 27 in FIG. 7 shows the change of the operation command to the external oil pump 20. LN 28 in FIG. 7 shows a change in the actual operating state of the external oil pump 20. LN 29 in FIG. 7 indicates a change in the normal flag of the external oil pump 20. LN 30 in FIG. 7 shows a change in the open abnormality flag of the external oil pump 20.

  For example, the precondition is satisfied (YES in S200), variable valve timing device 17 has no abnormality (YES in S202), and cylinder deactivation devices 14 and 16 have no abnormality. A case is assumed (YES in S204).

  When the abnormality detection condition for open abnormality is satisfied at time t (20) (YES in S206), the operation is commanded to external oil pump 20 (S208). As shown in LN 27 in FIG. 7, the external oil pump 20 is not commanded to operate in the period prior to time t (20) (off state), and in this case, the state where the command is not commanded continues It will be done.

  At this time, the variable valve timing device 17 is instructed to operate (S210). Therefore, as shown by LN 21 in FIG. 7, after time t (20), the command actuation angle of variable valve timing device 17 increases with the passage of time, and at time t (21), the command actuation angle is Reach A, then be maintained.

  When the external oil pump 20 is in the normal state, as indicated by LN 27 and LN 28 in FIG. 7, since the operation command is in the OFF state, the external oil pump 20 is in the stop state. Therefore, as the hydraulic pressure is not supplied to the variable valve timing device 17, the actual operating angle of the variable valve timing device 17 does not follow the commanded operating angle as shown in LN 22 of FIG.

  Since the magnitude of the difference between the actual operating angle and the command operating angle is equal to or greater than the threshold value, it is determined that the actual operating angle does not follow the command operating angle (NO in S212). Therefore, as shown by LN 23 in FIG. 7, the off state of the follow-up abnormality flag of the variable valve timing device 17 is maintained.

  At time t (22), as shown by LN 24 in FIG. 7, the operation is commanded to the cylinder deactivation device 14, 16 (S216). Therefore, the OSVs 14b and 16b are in the open state. When the external oil pump 20 is in the normal state, the oil pressure required for the operation of the cylinder deactivation devices 14 and 16 is not supplied, so that the cylinder deactivation devices 14 and 16 are deactivated (see LN 25 in FIG. 7). It becomes a state where it does not shift from 4 cylinder operation to 2 cylinder operation).

  As a result, it is determined that the cylinder deactivation device 14 or 16 is not operating (NO in S218), and the follow abnormality flag of the cylinder deactivation device 14 or 16 is kept off as shown in LN 26 of FIG. Become.

  Since the follow-up abnormality flag of variable valve timing device 17 is in the off state and the follow-up abnormality flag of cylinder deactivation device 14 or 16 is in the off state (NO in S222, YES in S228), time t (23 Then, as shown in LN 29 of FIG. 7, the normal flag of the external oil pump 20 is turned on (S230). The open abnormality flag of the external oil pump 20 maintains the off state as shown in LN 30 in FIG. 7.

<About the effect by the engine 1 which concerns on this Embodiment>
As described above, according to the engine 1 according to the present embodiment, when the operation is commanded to the external oil pump 20, the cylinder deactivation device 14, 16 and the variable valve timing device 17 do not operate. It can be determined that a closed abnormal state in which the hydraulic pressure does not increase in the external oil pump 20 is occurring. Furthermore, the open abnormality state in which the oil pressure does not decrease in the external oil pump 20 when the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 are activated when the operation stop is commanded to the external oil pump 20 Can be determined. Therefore, it is possible to accurately determine whether the external oil pump 20 is in an abnormal state without providing new sensors. Therefore, it is possible to provide an engine that detects an abnormality of the external oil pump with high accuracy while suppressing an increase in manufacturing cost.

  Also, the external oil pump is determined by determining that the operation state of any one of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 is not the operation state corresponding to the control command for the external oil pump 20 multiple times. It can be determined with high accuracy whether or not 20 is an abnormal state.

Hereinafter, modified examples will be described.
Although the above embodiment has been described by way of example where the present invention is applied to a gas engine, the engine may be an internal combustion engine such as a gasoline engine or a diesel engine, and is particularly limited to the gas engine It is not a thing.

  Furthermore, in the above embodiment, the abnormal flag or the following abnormal flag of one of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 is in the ON state, and the other abnormal flag or the following abnormal flag is off. In the case where the external oil pump 20 is in the state, it is described that the temporary abnormality determination number is counted up and it is determined that the external oil pump 20 is in the closed abnormality state or the open abnormality state when the temporary abnormality determination number exceeds the threshold. When the abnormality flag or the follow-up abnormality flag of one of the cylinder deactivation devices 14 and 16 and the variable valve timing device 17 is in the on state and the other abnormality flag or the follow-up abnormality flag is in the off state, It may be determined that the oil pump 20 is in the close abnormal state or the open abnormal state.

  Furthermore, in the above embodiment, the variable valve timing device 17 has been described as changing the opening and closing timings of the intake valve and the exhaust valve, but changing the opening and closing timing of at least one of the intake valve and the exhaust valve It may be

In addition, the above-mentioned modification may be implemented combining the whole or one part.
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

Reference Signs List 1 engine, 2 intake system, 4 exhaust system, 10 engine body, 11 cylinders, 12 ignition coils, 14, 16 cylinder deactivation devices, 17 variable valve timing devices, 18 built-in oil pumps, 20 external oil pumps, 40 intake manifolds, 42 Throttle, 44 first fuel supply device, 46 second fuel supply device, 48 intake passage, 50 air cleaner, 54 regulator, 56 solenoid valve, 70 exhaust manifold, 72 exhaust passage, 74 exhaust purification device, 76 muffler, 100 intake temperature sensor , 102 intake pressure sensor, 104 water temperature sensor, 106 crank angle sensor, 108 cam angle sensor, 110 O ₂ sensor, 200 engine ECU.

Claims (4)

With multiple cylinders,
A first oil pump incorporated in the engine body to generate an oil pressure according to the engine speed;
An electric second oil pump provided outside the engine body and generating oil pressure when the engine speed is within a predetermined speed range;
The operating oil pressure generated in at least one of the first oil pump and the second oil pump is used to close a valve provided at the top of any one of the plurality of cylinders, thereby closing the valve. A cylinder deactivation device that deactivates some cylinders,
A variable valve timing device that changes the open / close timing of the valve using the hydraulic pressure;
A control device for controlling the second oil pump, the cylinder deactivation device, and the variable valve timing device;
When the engine speed is within the predetermined speed range and the cylinder deactivation device and the variable valve timing device are commanded to operate, the control device is configured to An engine that determines that the second oil pump is in an abnormal state when the operating state of at least one of the variable valve timing devices is not in accordance with a control command for the second oil pump.   When the engine speed is within the predetermined speed range and the cylinder deactivation device and the variable valve timing device are commanded to operate, the control device is configured to When the number of times of determining that the operating state of any one of the variable valve timing devices is not the operating state corresponding to the control command for the second oil pump is more than a predetermined number of times, the second oil The engine according to claim 1, wherein it is determined that the pump is in an abnormal state.   The control device commands operation to each of the cylinder deactivation device, the variable valve timing device, and the second oil pump, wherein the engine speed is within the predetermined speed range. In this case, when both the cylinder deactivation device and the variable valve timing device are in the operation stop state, it is determined that the abnormal state in which the hydraulic pressure generated in the second oil pump does not increase is described. Engine.   The control device instructs the cylinder deactivation device and the variable valve timing device to operate while the engine rotation speed is within the predetermined rotation speed region, and the second oil pump When the cylinder deactivation device and the variable valve timing device are both in the operating state when commanding the operation stop to the engine operating state, it is determined that the abnormal condition does not cause the oil pressure generated in the second oil pump to decrease. The engine according to any one of claims 1 to 3.

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