JP6134280B2 - Electronic control module for internal combustion engine - Google Patents

Description

  The present invention relates to an electronic control module for an internal combustion engine in which a temperature sensor is mounted on an electronic control device that controls the internal combustion engine.

  In recent years, an electronic control unit (ECU) for an internal combustion engine mounted on an automobile has not been provided in a passenger compartment as in the past, but has a higher temperature for the purpose of reducing the cost of a signal harness and reducing the number of assembly steps. It is becoming installed in the room. On the other hand, the engine ECU has been improved in performance and size, and the heat dissipation is difficult because the surface area is reduced by the size reduction.

  Against this background, the resin that is fixed to the intake passage body for the purpose of suppressing the increase in intake resistance in the intake passage after improving heat dissipation by providing the engine ECU in the intake passage An invention has been proposed in which a molded connector part and a circuit board fixed on a metal plate disposed in an intake passage and to which an electric circuit component is attached are provided, and the metal plate is formed long in a direction along the air flow. (Patent Document 1). Further, in Patent Document 1, an intake air amount measuring device in which a heating resistor for measuring air flow rate and a temperature sensitive resistor for measuring intake air temperature are provided inside a housing is mounted on a metal plate, and the engine ECU and the intake air are measured. It is also disclosed that a compact intake system is constructed at low cost by eliminating the need for a harness and the like by integrating the air flow rate measuring device.

Japanese Patent No. 4282938

  However, the electronic control module disclosed in Patent Document 1 only detects the intake air temperature with a temperature-sensitive resistor integrated with an engine ECU disposed in the intake pipe. Therefore, when a sensor for managing the temperature of the engine ECU is attached to this configuration, a plurality of temperature sensors are mounted on the electronic control module, and space efficiency is deteriorated.

  In view of such a background, an object of the present invention is to provide an electronic control module for an internal combustion engine that can perform both temperature management of an engine ECU and detection of intake air temperature without causing reduction in space efficiency. .

  In order to solve such a problem, at least a part (13a) of the electronic control module (10) of the internal combustion engine (1) according to the present invention is disposed inside the intake passage (5) of the internal combustion engine (1). In the electronic control device (11) for controlling the internal combustion engine (1) attached to the intake passage body (6) that defines the intake passage (5), and the electronic control device (11) A temperature sensor (12) mounted on a portion (13a) disposed inside the intake passage (5), and the temperature sensor (12) measures the temperature of the electronic control unit (11) and measures the intake air temperature. It is also characterized by serving.

  According to this configuration, it is possible to perform both the temperature measurement of the electronic control device and the intake air temperature measurement with this temperature sensor without reducing the space efficiency by using a single temperature sensor mounted on the electronic control device. .

  In the above invention, the electronic control unit (11) includes a circuit board (13a) on which the electronic element (13b) is mounted and at least a part of the electronic control unit (11b) is disposed inside the intake passage (5). The temperature sensor (12) can be configured to be installed in a region (15) that is least susceptible to heat when the electronic element (13b) generates heat in the circuit board (13a).

  According to this configuration, the detection value of the temperature sensor can be brought close to the intake air temperature, and the measurement accuracy of the intake air temperature can be improved.

  In the above invention, the electronic control unit (11) uses the temperature detected by the temperature sensor (12) as an intake air temperature, and the electronic control unit (11) based on the temperature detected by the temperature sensor (12). ) Temperature).

  According to this configuration, the temperature of the electronic control device can be accurately estimated by correcting the temperature detected by the temperature sensor.

  In the above invention, the electronic control device (11) includes the control device main body (13) in which the temperature sensor (12) is mounted and disposed in the intake passage (5), and the intake passage. (5) It can be set as the structure which has the control apparatus radio | wireless part (14) which is arrange | positioned outside and performs the electric power feeding and data transmission / reception by radio | wireless with respect to the said control apparatus main-body part (13).

  According to this configuration, since it is not necessary to provide a through hole in the intake passage body in order to pass the harness for power supply and data transmission / reception to the control device main body, the airtightness of the intake passage body is improved.

  In the above invention, the control device main body (13) is attached to the inner wall surface (6i) of the intake passage body (6), and the control device wireless portion (14) is connected to the intake passage body (6). ) On the wall outer surface (6o) of the intake passage body (6) at a position facing the control device main body (13) across the wall (6w).

  According to this configuration, since the control device radio unit and the control device main body unit can be disposed close to each other, power supply performance and data communication performance can be improved.

  As described above, according to the present invention, it is possible to provide an electronic control module for an internal combustion engine that enables the temperature management of the engine ECU and the detection of the intake air temperature without causing a reduction in space efficiency.

The schematic diagram which shows the arrangement structure of the electronic control module of the internal combustion engine which concerns on embodiment The top view which shows the attachment state of the electronic control module shown in FIG. FIG. 1 is a cross-sectional plan view showing a mounting state of the electronic control module shown in FIG. Front view showing temperature distribution of circuit board shown in FIG. Illustration of ECU center ambient temperature estimation data

  Hereinafter, an embodiment in which the present invention is applied to an internal combustion engine 1 of an automobile will be described in detail with reference to the drawings. The internal combustion engine 1 may be a known engine such as a gasoline engine, a diesel engine, or an HCCI engine. In the present embodiment, an example in which the internal combustion engine 1 is a gasoline engine will be described.

  As shown in FIG. 1, the internal combustion engine 1 is installed in an engine room 2 of an automobile. Although detailed illustration is omitted, the internal combustion engine 1 includes a cylinder block in which four cylinder bores are formed, a cylinder head joined to an upper part of the cylinder block and having a combustion chamber, an intake port and an exhaust port, and an upper part of the cylinder head. And a head cover that forms a valve operating chamber with the cylinder head, and an oil pan joined to the lower part of the cylinder block. An intake system 3 and an exhaust system 4 are joined to the cylinder block of the internal combustion engine 1.

  The intake system 3 includes an intake passage body 6 (6a, 6b, 6c, 6d, 6e) such as a pipe member 6a that defines an intake passage 5 (see FIG. 3). The exhaust system 4 is configured by an exhaust passage body 7 (7a, 7b,...) Such as a pipe member 7a that defines an exhaust passage. The intake system 3 includes an intake pipe 6b that forms an intake port 5a, an air cleaner 6c, a throttle body 6d, an intake manifold 6e, and the like as intake passage bodies 6 on the path from the upstream end to the internal combustion engine 1. The exhaust system 4 includes an exhaust manifold 7b, a catalytic converter, a silencer, and the like as an exhaust passage body 7 on a path from the internal combustion engine 1 to the downstream end.

  The engine room 2 is equipped with a battery 8 as a power source. The intake pipe 6b has a substantially rectangular closed cross-sectional shape, and the electronic control module 10 is attached to a side wall extending substantially vertically.

  The electronic control module 10 includes an electronic control device 11 that controls various electric devices provided in the internal combustion engine 1 and the throttle body 6d, and a temperature sensor 12 that measures the intake air temperature. It operates with the power supplied. The electric devices to be controlled by the electronic control unit 11 include an electric motor for starting the internal combustion engine 1, a fuel injection device, an electric fuel pump, an ignition device, a throttle valve, an EGR valve, an oil control valve, and the like.

  As shown in FIGS. 2 and 3, the electronic control unit 11 wirelessly controls the control device main body 13 that controls various electric devices provided in the internal combustion engine 1 and the throttle body 6 d, and the control device main body 13. And a control unit radio unit 14 that performs power feeding and data transmission / reception. The control device main body 13 is attached to the wall inner surface 6 i of the intake pipe 6 b and is disposed inside the intake passage 5. The control device radio section 14 is attached to the wall outer surface 6o of the intake pipe 6b at a position facing the control apparatus main body section 13 across the wall 6w of the intake pipe 6b so as to be exposed to the outside of the intake passage 5, that is, the engine room 2. Placed in. Accordingly, no through hole is formed in the wall 6w of the intake pipe 6b.

  The control device main body 13 includes a circuit board 13a joined to the wall inner surface 6i of the intake pipe 6b, a plurality of electronic elements 13b such as a CPU mounted on the surface (one side in this embodiment) of the circuit board 13a, and a circuit A wireless power receiving unit 13c and a wireless communication unit 13d are mounted on the surface of the substrate 13a on the side where the electronic element 13b is mounted. The above-described temperature sensor 12 is also mounted on the surface of the circuit board 13a on the side where the electronic element 13b is mounted.

  The circuit board 13a is a printed board in which an external circuit layer is printed on an insulating layer. In this embodiment, the circuit board 13a is a single-sided board in which the external circuit layer is formed only on one side, and a ceramic board made of ceramic. . The circuit board 13a includes a double-sided board with external circuit layers formed on both sides, a glass / epoxy board in which glass fiber is impregnated with an epoxy resin, and a metal core board having a core metal layer as a high thermal conductive layer sandwiched between insulating layers. , A metal base substrate having a metal base layer with an insulating layer laminated on only one surface as a high thermal conductive layer, a relatively rigid rigid substrate, a deformable flexible substrate, a rigid portion and a deformable portion. It may be a rigid flexible substrate or the like.

  In the present embodiment, the temperature sensor 12 is a thermistor temperature sensor that measures the temperature using the change in the electrical resistance of the oxide, and is provided inside the intake passage 5 to detect the intake air temperature. The temperature sensor 12 is a resistance thermometer that measures the temperature using a change in electric resistance of a metal, a thermocouple that measures the temperature using an electromotive force generated between two different metal contacts, and the like. May be.

  The control device radio unit 14 includes a circuit board 14a joined to the wall outer surface 6o of the intake pipe 6b, a radio power transmission unit 14c and a radio communication unit 14d mounted on the surface (one side in this embodiment) of the circuit board 14a, respectively. And a connector 14e provided on the side surface (side surface on the upstream side of intake air) of the circuit board 14a to which the harness 9 (FIG. 1) is connected.

  The control device wireless unit 14 receives supply of power from the harness 9 connected to the connector 14e, and supplies power to the wireless power reception unit 13c of the control device main body 13 through the wireless power transmission unit 14c. Transmission of power from the wireless power transmission unit 14c to the wireless power reception unit 13c is performed using a mutual induction effect. The harness 9 is connected to various sensor units (not shown). The sensor unit includes a crank angle sensor that detects a crank angle, a throttle opening sensor that detects the opening of a throttle valve, an accelerator pedal sensor that detects an operation amount (depression amount) of an accelerator pedal, and an exhaust system 4. An exhaust gas oxygen concentration sensor that detects the oxygen concentration in the exhaust gas, an air flow sensor that is provided in the intake system 3 and detects the intake flow rate in the intake system 3, a cooling water temperature sensor that detects the temperature of the cooling water flowing in the cylinder block, A knock sensor or the like that is provided in the cylinder block and detects the presence or absence of knocking from the vibration of the cylinder block is included. The detection value signal transmitted from the sensor unit is input from the harness 9 to the control device wireless unit 14 via the connector 14e and transmitted to the wireless communication unit 13d of the control device main body 13 via the wireless communication unit 14d.

  The control device main body 13 operates with the electric power received by the wireless power receiving unit 13c, and is stored in advance in the ROM based on detection value signals from various sensor units received by the communication unit and detection value signals of the temperature sensor 12. The control program is executed to generate control signals for various electric devices, and the control signals are transmitted from the wireless communication unit 13d. The transmitted control signal is received by the wireless communication unit 14d of the control device wireless unit 14, and is transmitted from the connector 14e to each electric device via the harness 9. In this way, the electric devices provided in the internal combustion engine 1 and the throttle body 6d are controlled by the electronic control unit 11.

  Among the electronic elements 13b, elements having a large heat generation amount such as a CPU, a power supply circuit, a driving circuit, and the like composed of a power MOS transistor or the like generate heat when the load increases, and the circuit board 13a, the control device main body 13, and the entire electronic control device 11 Raise the temperature. Therefore, although the details will be described later, the electronic control module 10 measures (estimates) the ambient temperature (air temperature) near the center of the electronic control unit 11 based on the temperature (detection value signal) detected by the temperature sensor 12. The temperature management of the electronic control device 11 is performed by regarding this value as the temperature of the electronic control device 11. In the present embodiment, since the electronic control device 11 includes the control device main body 13 and the control device communication unit, the ambient temperature near the central portion of the control device main body 13 is set to the central portion of the electronic control device 11. The ambient temperature, that is, the temperature of the electronic control device 11 is used.

  Here, the temperature management of the electronic control device 11 performed by the electronic control module 10 is intended to correct, for example, circuit characteristics that change with temperature. Specifically, since the current value detected when the electronic control device 11 detects a current differs from the actual current depending on the temperature, the temperature of the electronic control device 11 is set to −40 ° C., 40 ° C., 120 ° C. The current can be detected with high accuracy by dividing the detected current into a relatively large temperature range and adding a correction corresponding to each temperature range to the detected current. The electronic control module 10 also performs temperature management for the purpose of protecting the electronic control device 11, for example. Specifically, when the temperature of the electronic control device 11 is abnormally high, the electronic control module 10 reduces the load on the electronic control device 11, thereby preventing the electronic control device 11 from being runaway or damaged.

  FIG. 4 shows the temperature distribution of the circuit board 13a based on the temperature simulation. As shown in the figure, the circuit board 13a includes a CPU, a power supply circuit, a drive circuit, and the like that are provided with leader lines when the electronic elements 13b (including those that are not provided with leader lines) generate heat. The temperature is highest in the region where the electronic elements 13b are attached, and becomes lower as the distance from the region where the electronic elements 13b are attached. FIG. 4 shows the temperature distribution in a state where the circuit board 13a is installed vertically. At positions separated by the same distance in the horizontal direction from these regions (regions indicated by 13b), The temperature is lower in the region separated downward by the same distance than in the region separated upward. The temperature is lowest at the lower right corner 15 of the circuit board 13a, and the temperature sensor 12 is provided at the corner 15. The temperature sensor 12 is disposed at the corner 15 on the upstream side and the lower side of the intake passage 5 as shown in FIG.

  Accordingly, when the electronic control device 11 is activated and the electronic element 13b generates heat, the temperature sensor 12 is disposed at a position that is least affected by the heat of the electronic element 13b, and the electronic control device 11 detects the temperature sensor 12. The temperature is used as an intake air temperature to control various electric devices. On the other hand, as described above, the electronic control device 11 estimates the temperature of the electronic control device 11 based on the temperature detected by the temperature sensor 12.

  Specifically, the electronic control unit 11 reads a table stored in advance in the ROM, and uses the detection value of the temperature sensor 12, that is, the intake air temperature as an address, the temperature of the electronic control unit 11 (near the central part of the control unit main body 13). Estimate the ambient temperature. This table is preset as follows. First, a temperature simulation and a fluid simulation are performed under the condition of the maximum load mode (maximum heat generation mode) of the circuit board 13a, and correlation data between the temperature of the temperature sensor 12 installation region and the ambient temperature near the center of the control device main body 13 is obtained. (A solid line in the graph of FIG. 5). Separately from this, for the actual machine, the temperature is actually measured under the condition of the maximum load mode (maximum heat generation mode) of the circuit board 13 a, and the temperature in the temperature sensor 12 installation region and the atmosphere near the center of the control device main body 13. Correlation data with temperature is taken (broken line in the graph of FIG. 5). Then, based on both correlation data, the correlation between the temperature detected by the temperature sensor 12 and the ambient temperature near the center of the control device main body 13 is determined. In the present embodiment, an intermediate value between the two correlation data (solid line and broken line in the graph of FIG. 5) is set as temperature estimation data (one-dot chain line in the graph of FIG. 5).

  As described above, the electronic control device 11 has the control device main body 13 disposed inside the intake passage 5, and the detected value of the temperature sensor 12 mounted on the control device main body 13 is set as the intake air temperature. The temperature of the electronic control unit 11 is estimated based on the detection value of the temperature sensor 12 using a table based on the result and the actual measurement result. That is, the temperature sensor 12 serves as both intake air temperature measurement and temperature measurement of the electronic control device 11. Thereby, it is possible to perform both the temperature measurement of the electronic control device 11 and the intake air temperature measurement without reducing the space efficiency by using one temperature sensor 12 mounted on the electronic control device 11. In addition, it is possible to accurately estimate the temperature of the electronic control unit 11 by correcting the detection value of the temperature sensor 12. The estimated temperature of the electronic control device 11 is the temperature in the maximum heat generation mode, that is, the maximum temperature that can be taken near the center of the electronic control device 11, and the temperature control of the electronic control device 11 is performed for the above purpose. Therefore, it is sufficient to use this estimated value.

  In the present embodiment, the control device main body 13 of the electronic control device 11 has the circuit board 13a on which the electronic element 13b is mounted and disposed inside the intake passage 5, and the temperature sensor 12 is an electronic device in the circuit board 13a. The element 13b is installed in a region where the temperature is lowest when heat is generated. As a result, the temperature sensor 12 is installed in a region that is least susceptible to the heat of the electronic element 13b on the circuit board 13a, the detection value of the temperature sensor 12 approaches the actual intake air temperature, and the measurement accuracy of the intake air temperature is improved. .

  In the present embodiment, the temperature sensor 12 is mounted, the control device main body 13 disposed inside the intake passage 5, and the control device main body 13 disposed outside the intake passage 5. The electronic control device 11 has a control device wireless unit 14 that performs transmission and reception. Thereby, there is no need to provide a through hole in the intake passage body 6 in order to pass the harness 9 for power supply and data transmission / reception to the control device main body 13, and the airtightness of the intake passage body 6 is improved.

  Further, in the present embodiment, the control device main body 13 is attached to the wall inner surface 6i of the intake passage body 6 and the control device radio section 14 is opposed to the control device main body 13 across the wall 6w of the intake passage body 6. It is attached to the wall outer surface 6 o of the intake passage body 6. As a result, the control device radio unit 14 and the control device main body unit 13 can be arranged close to each other, and the power supply performance and data communication performance are improved.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above-described embodiment, the electronic control module 10 is applied to the internal combustion engine 1 of an automobile as an example, but the present invention can be widely applied to a railway vehicle, an aircraft, and the like. Moreover, in the said embodiment, although the electronic control module 10 is attached to the intake pipe 6b, you may attach to intake passage bodies 6, such as the air cleaner 6c, the intake manifold 6e, and the pipe member 6a. Furthermore, in the above-described embodiment, the electronic control device 11 is configured by the control device main body 13 and the control device radio unit 14, but the electronic control device 11 is configured as a single member and at least a part of the intake passage. 5 may be disposed inside. In addition, the specific configuration, arrangement, quantity, angle, and the like of each member and part can be changed as appropriate without departing from the spirit of the present invention. On the other hand, all the components of the electronic control module 10 shown in the above embodiment are not necessarily essential, and can be selected as appropriate.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 5 Intake passage 6 Intake passage body 6b Intake pipe 6i Wall inner surface 6o Wall outer surface 6w Wall 10 Electronic control module 11 Electronic control device 12 Temperature sensor 13 Control device main-body part 13a Circuit board 13b Electronic element 14 Control device radio | wireless part 15 Corner (Lowest temperature area)

Claims (4)

An electronic control device for controlling the internal combustion engine, which is attached to an intake passage body defining the intake passage so that at least a part thereof is disposed inside the intake passage of the internal combustion engine;
A temperature sensor mounted on a portion arranged inside the intake passage in the electronic control unit,
The electronic control device includes a circuit board on which an electronic element is mounted and at least a part of the electronic control device is disposed inside the intake passage.
The temperature sensor is installed in an area of the circuit board that is least susceptible to heat when the electronic element generates heat, and serves as both temperature measurement of the electronic control unit and intake air temperature measurement. Control module. 2. The internal combustion engine according to claim 1, wherein the electronic control unit estimates the temperature of the electronic control unit based on the temperature detected by the temperature sensor using the temperature detected by the temperature sensor as an intake air temperature. Electronic control module. The electronic control device is mounted with the temperature sensor, and is disposed inside the intake passage, and is disposed outside the intake passage. The electronic control device wirelessly supplies power and data to the control device main body. engine electronic control module according to claim 1 or claim 2, characterized in that a control unit radio section for transmitting and receiving. The control device main body is attached to the inner wall surface of the intake passage body, and the control device radio section is located at a position facing the control device main body with the wall of the intake passage body interposed therebetween. 4. The electronic control module for an internal combustion engine according to claim 3 , wherein the electronic control module is attached to an outer surface.

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