JP2004044407A - Troubleshooting control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent such an engine stall and a poor engine start from which a defective system and a defective part cannot be specified from being re-verified by a service shop by identifying the engine stall and the poor engine start as troubles and storing the running state in that state. <P>SOLUTION: This troubleshooting control device for a vehicle comprises a function having trouble codes different for each on-vehicle part so that a trouble on-vehicle part can be specified and outputting and storing the trouble code when the troubled on-vehicle part is present. The device also comprises a determination function measuring, at the time of starting, a start rotational speed and an elapsed time after start-on and comparing the measured value with a set value and, when the set requirements are satisfied, determining that a start trouble including the engine stall and the poor engine start occurs and a storage function storing start data obtained when the start trouble was determined to occur. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a failure diagnosis control device for a vehicle, and particularly identifies an engine stall or an engine start failure in which a failure of a system or a component cannot be identified as a failure, saves its running state, and performs a reexamination by a repair trader. The present invention relates to a vehicle failure diagnosis control device that can be omitted.
[0002]
[Prior art]
In recent years, domestic and foreign exhaust gas regulations have become stricter year by year, and accordingly, the demand for on-board diagnostics (OBD: On-Board Diagnostic) of on-vehicle electronic controllers has also become stricter.
[0003]
In the basic failure diagnosis, when the running state of the vehicle satisfies certain conditions, the input / output of the on-vehicle electronic controller is monitored to determine whether it is normal or abnormal. If it is determined that there is an abnormality, a failure code (DTC: Diagnostic Trouble Code) for identifying which part or system is abnormal and the running state when the failure determination is performed are stored in a data holding memory (EEPROM or battery power supply). (Backed up RAM).
[0004]
As the vehicle fault diagnosis control device, there is one disclosed in Japanese Patent Application Laid-Open No. 9-26380. The vehicle data collection device disclosed in this publication steadily receives data such as output values of sensors and actuators as necessary items while communicating with an ECM mounted on the vehicle. When necessary parts are recorded and stored, the received data is sequentially recorded and stored on the rotation address of the rolling RAM within the recording range on the RAM, and the engine speed of the engine driving the vehicle is detected by the CPU. If the rate of change of the engine speed at the time of falling in the low engine speed range of the engine speed exceeds a predetermined reference value, the CPU generates a rotation drop trigger and generates the rotation speed of the received data in the rolling RAM on the RAM. The recording / storing operation is stopped after a predetermined time, and data necessary for failure diagnosis is reliably collected even in a low rotation range where a sudden drop in the engine speed is likely to occur.
[0005]
[Problems to be solved by the invention]
By the way, a failure diagnosis program in a conventional in-vehicle electronic controller detects a failure of a specific system and a part, and stores a failure code for identifying the content of the failure and a running state at the time of the failure.
[0006]
Then, when there is a data request from the failure diagnosis tester, the in-vehicle electronic controller responds the data to the failure diagnosis tester. The failure diagnosis tester displays the data on a display and notifies the operator of the failure.
[0007]
However, failures detected inside the current in-vehicle electronic controller are limited to failures of specific systems and components.
[0008]
In other words, in the current failure diagnosis, if it is not possible to identify the system or part at the time of starting failure such as engine stall or engine start failure, which is considered to be caused by a very large number of system or part failures Are not determined as failures.
[0009]
Engine stalls and poor engine start-ups are serious failures for the customer, but the current failure diagnosis program cannot determine these as failures, so no failure code remains when the customer brings the vehicle to a repair shop. In order to understand the situation, repairers must re-examine the malfunction.
[0010]
In addition, engine stalls and poor starting of the engine often occur only under special conditions, and in the case of failures with low reproducibility, it takes a long time to re-verify, and it is very difficult to analyze the cause of the failure. In addition to this, there is a disadvantage that the customer and the repair contractor are forced to perform many steps and inconvenience, which is disadvantageous in practical use.
[0011]
[Means for Solving the Problems]
Therefore, the present invention detects a failure of an in-vehicle component and provides a different failure code for each in-vehicle component so that the failed in-vehicle component can be identified. In a vehicle failure diagnosis control device having a function of outputting a failure code and storing the failure code, at the time of starting, the starting rotation speed and the elapsed time after the starter is turned on are measured, and the measured value and a preset value are compared. When a set condition is satisfied, a determination function to determine that a start failure has occurred including an engine stall or a poor start of the engine, and a save function to store start data when the start failure has been determined. And characterized in that:
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the invention as described above, at the time of starting, the starting rotational speed and the elapsed time after the starter is turned on are measured, and the measured value is compared with a preset value. The function is used to determine that a start-up failure has occurred, including engine stalls and engine start-up failures, and the save function saves start-up data when a start-up failure has been determined. Since the data at the time of the start-up failure is stored, even if the failure has low reproducibility, the cause of the failure can be easily identified, the repair time can be shortened, and the product competitiveness is improved. Have contributed.
[0013]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
1 to 3 show an embodiment of the present invention. 2 and 3, reference numeral 2 denotes a vehicle, 4 denotes an on-vehicle electronic controller (e.g., ECM or TCM as the on-vehicle electronic controller 4) on which a failure diagnosis program of the vehicle failure diagnosis control device is programmed. 6 is a failure diagnosis tester which is an external device, 8 is a connector unit for connecting the vehicle-mounted electronic controller 4 and the failure diagnosis tester 6, 10 is a vehicle-mounted sensor, 12 is an actuator such as a fuel injection valve, 14 is another controller, Reference numeral 16 denotes a power supply (also referred to as “battery”), and reference numeral 18 denotes an ignition (also referred to as “IG”) switch.
[0015]
The on-vehicle electronic controller 4 mounted on the vehicle 2 has a first communication port 4A, which is a serial communication port for performing data communication with the failure diagnosis tester 6 by serial communication, and an input processing circuit 4E to be described later. A CPU 4B, which is a central processing unit that calculates an optimal control amount for target control based on the signal and outputs a control signal based on the calculation result, and a block rewritable ROM (factory) that stores control programs and data. In the case of programming by a CPU, a flash memory or an EEPROM 4C, a RAM 4D for storing data for the CPU 4B to perform calculations, an input processing circuit 4E for inputting a signal from the vehicle-mounted sensor 10 and performing waveform processing, and a CPU 4B. An output control circuit 4F that drives the actuator 12 in response to the control signal of A second communication port 4G for communicating with the 14, are provided a power supply circuit 4H.
[0016]
In addition, the on-vehicle electronic controller 4 stores the failure code and the running state in an internal storage memory part when the failure is determined by the failure diagnosis program.
[0017]
After being connected to the on-vehicle electronic controller 4, the failure diagnosis tester 6 reads out the failure code and the running state stored in the storage memory portion inside the on-vehicle electronic controller 4, and displays them on a display (not shown). Things.
[0018]
The connector section 8 includes a vehicle-side first connector section 8-1 and an external device-side second connector section 8-2. The first communication port 4A, which is the serial communication port, and the vehicle-side first connector section 8- 1 and a first serial communication line (also referred to as a "first serial communication signal line") 20 for connecting the external device 6 to the external device-side communication port (not shown) of the external device 6 and the external device-side second connector 8-2. The second serial communication line (also referred to as a “second serial communication signal line”) 22 is provided to connect the failure diagnosis tester 6, which is an external device, to the on-vehicle electronic controller 4.
[0019]
Further, as shown in FIG. 3, a power supply 16 located on the vehicle 2 side and an ignition switch 18 are connected and provided in the power supply circuit 4H of the on-vehicle electronic controller 4. The power supply 16 is connected to the failure diagnostic tester 6 via the connector 8 by a power supply line 24 and a ground line 26.
[0020]
Further, the on-vehicle electronic controller 4 of the on-vehicle failure diagnosis control device detects a failure of the on-vehicle component and provides a different failure code for each on-vehicle component so that the failed on-vehicle component can be identified. It has a function to output a failure code when there is a part and to save it.
[0021]
At this time, the start-up rotation speed and the elapsed time after the starter is turned on are measured by the on-vehicle electronic controller 4 of the vehicle failure diagnosis control device at the time of starting, and the measured value is compared with a preset value. In addition, when the set conditions are satisfied, a judgment function to judge that a start failure including an engine stall or a poor start of the engine has been added, and a save function to save the start data when the start failure has been determined are added. Configuration.
[0022]
More specifically, the set condition is a condition that can distinguish between an engine stall and a poor start of the engine.
[0023]
Further, the condition for identifying the engine stall is to satisfy that at least the engine speed during startup once exceeds the set engine speed and then falls to or below the set engine speed.
[0024]
Then, the following data is set as specific data of the above-described determination function.
(1) Elapsed time from start of running starter <In case of engine stall>
・ Elapsed time during stall judgment <in case of poor engine start>
-If the engine cannot be started, a dummy value is set. If the engine can be started, the elapsed time when the engine speed reaches or exceeds a predetermined engine speed.
(2) Frequency In order to analyze the frequency of occurrence, the number of rotations at which the ignition switch 18 was turned on and the starter motor (not shown) was turned on and the number of occurrences of engine start failure and engine stall were calculated. The information is stored in a memory and can be displayed on the failure diagnosis tester 6 as one of the traveling state data.
(3) Fuel remaining amount
Next, the operation will be described with reference to the control flowchart of FIG.
[0026]
First, after the ignition switch 18 is turned on (100), it is determined whether a starter motor (not shown) is turned on (102). If the judgment (102) is NO, the judgment (102) is YES. The determination (102) is repeated until the determination is YES. If the determination (102) is YES, the process proceeds to a determination (104) as to whether or not the starting rotation speed has reached a predetermined engine rotation speed.
[0027]
If the determination (104) of whether or not the starting rotation speed has reached the predetermined engine rotation speed is YES, whether or not a predetermined time has elapsed after the ON operation of the starter motor, that is, whether or not a preset value has elapsed is determined. The process proceeds to the determination (106), and if the determination (104) is NO, the process proceeds to a determination (108) as to whether or not the ON operation of the starter motor is continuing.
[0028]
If the judgment (106) is YES in the judgment (106) as to whether or not a predetermined time has elapsed after the ON operation of the starter motor, that is, whether a predetermined value has elapsed, a failure code for identifying a poor engine start And at the same time the engine start data is saved (110), and the process proceeds to a judgment (112) as to whether or not the engine speed is equal to or lower than a predetermined speed. If the judgment (106) is NO, the engine The process directly proceeds to the determination (112) as to whether the rotation speed is equal to or lower than the predetermined rotation speed.
[0029]
If the determination (112) is NO in the determination (112) as to whether the engine speed is equal to or lower than the predetermined rotation speed, the determination (112) is repeated until the determination (112) becomes YES. When the determination (112) is YES, a determination (114) is made as to whether or not the ON operation of the ignition switch 18 is continuing.
[0030]
If the determination (114) is YES, the failure code for identifying the engine stall is stored, the data at the time of engine stall is stored (116), and the process proceeds to the end (122). In the case of (1), the process directly goes to the end (122).
[0031]
In the determination (108) of whether or not the ON operation of the starter motor is continuing, if this determination (108) is YES, it is determined whether or not the starting rotational speed has reached a predetermined engine rotational speed (104). If the determination (108) is NO, the process proceeds to a determination (118) as to whether or not a predetermined time, that is, a preset value has elapsed after the start operation of the starter motor.
[0032]
If it is determined (118) that the predetermined time has elapsed after the start operation of the starter motor, that is, whether or not a preset value has elapsed, if the determination (118) is NO, it is determined whether the starter motor has been turned on. Is returned to the judgment (102), and if the judgment (118) is YES, the failure code for identifying the poor start of the engine is stored, the data at the time of starting the engine is stored (120), and the process proceeds to the end (122). .
[0033]
In this way, at the time of starting, the starting rotational speed and the elapsed time after the starter is turned on are measured, and the measured value is compared with a preset value. When the vehicle is repaired by a dealer or the like by the on-vehicle electronic controller 4 having a determination function for determining a start-up failure including a defect and a storage function for saving start-up data when the start-up failure is determined. Since the data at the time of the engine start failure is stored, even if the failure has low reproducibility, the cause of the failure can be easily identified, the repair time can be shortened, and the product Can contribute to improvement.
[0034]
Further, by setting the set conditions as conditions that can distinguish between an engine stall and a poor start of the engine, failures at the time of engine start can be subdivided according to symptoms, and at the time of repair, identification of a cause and reduction of repair time can be performed. It can be shortened and is practically advantageous.
[0035]
Further, as a condition for identifying the engine stall, at least the engine speed during startup once exceeds the set engine speed and then falls below the set engine speed. The engine stall can be identified simply by monitoring the engine speed, and the cost can be maintained at a low cost without adding a special sensor or the like, which is economically advantageous.
[0036]
The present invention is not limited to the above-described embodiment, and various modifications can be made.
[0037]
For example, in the embodiment of the present invention, when a set condition is satisfied, a determination function for determining a start failure including an engine stall or a poor start of the engine, and a start data when the start failure is determined. However, a special function may be added to add a function of notifying the cause of a failure when it is determined that a failure has occurred at startup.
[0038]
That is, when it is determined that a failure has occurred at the time of start, the data at the time of start determined when the failure was determined to be the start is saved, and at the same time, the cause of the failure is notified by voice, displayed on the front panel of the driver, or other measures are taken. Is notified to the driver by the notification function.
[0039]
Then, when a start-up failure occurs, the driver can know the cause of the failure, clear explanation can be made at the time of contacting the repair contractor, and if the vehicle can run Can perform a driving operation while paying attention to the cause of the failure.
[0040]
In addition, when the on-board electronic controller determines a start-up failure, a special configuration is provided that gives notice of matters (systems and various parts) that may cause the failure in advance of not being determined as a start-up failure. It is also possible.
[0041]
That is, at a stage before the start failure is determined, a part (system or various parts) that may cause a failure is notified in advance and a part (system or various parts) that may cause a failure is notified. The driving operation can be performed while caring about the parts, which can contribute to the prevention of failure, and can be repaired before causing the failure, thereby improving the reliability.
[0042]
【The invention's effect】
As described in detail above, according to the present invention, a failure code of each vehicle-mounted component is provided so that a failure of the vehicle-mounted component is detected and the failed vehicle-mounted component can be specified. In the vehicle failure diagnosis control device having the function of outputting and storing the start time, at the time of starting, the starting rotational speed and the elapsed time after the starter is turned on are measured, and the measured value is compared with a preset value. Then, when the set conditions are satisfied, a determination function for determining a start failure including an engine stall or a poor start of the engine, and a save function for saving start data when the start failure is determined. With this feature, when repairs are performed by a dealer or the like, the data when a failure is determined at the time of engine startup is stored. It can be identified to the easy, it is possible to shorten the repair time, it can contribute to improving product competitiveness.
[Brief description of the drawings]
FIG. 1 is a control flowchart of a vehicle failure diagnosis control device according to an embodiment of the present invention.
FIG. 2 is a schematic left side view of the vehicle.
FIG. 3 is a hardware configuration diagram of serial communication of the vehicle-mounted electronic controller.
[Explanation of symbols]
2 Vehicle 4 In-vehicle electronic controller 4A First communication port 4B CPU
4C ROM
4D RAM
4E Input processing circuit 4F Output control circuit 4G Second communication port 4H Power supply circuit 6 Failure diagnosis tester 8 Connector section 8-1 Vehicle-side first connector section 8-2 External device-side second connector section 10 In-vehicle sensor 12 Actuator 18 Ignition switch

Claims (3)

A vehicle having a function of detecting a failure of an in-vehicle component, providing a different failure code for each in-vehicle component so that the failed in-vehicle component can be identified, outputting a failure code when there is a failed in-vehicle component, and storing the same. At the time of starting, the failure diagnosis control device measures the starting rotation speed and the elapsed time after the starter is turned on, compares the measured value with a preset value, and when the set condition is satisfied, the engine stall. Fault diagnosis for a vehicle, comprising: a judgment function for judging a start failure including a malfunction of the engine or a start of the engine; and a storage function for saving start data when the start failure is judged. Control device. 2. The vehicle failure diagnosis control device according to claim 1, wherein the set condition is a condition capable of distinguishing between an engine stall and a poor start of the engine. 3. 3. The vehicle according to claim 2, wherein the condition for identifying the engine stall is to satisfy that at least the engine speed during startup once exceeds the set engine speed and then falls below the set engine speed. Fault diagnosis control device.

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