JP2017096186A - Vehicle electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vehicle mounted with an idling stop function to appropriately store a reason for being unable to restart an engine even though an engine automatic restart condition is met when the engine is in an automatic stop state.SOLUTION: A vehicle electronic control device stores nonvolatile memory storage objective data, preliminarily set as the data to be stored in a nonvolatile memory among the data to be stored in a volatile memory, in the volatile memory during a period from when an engine is stopped with an automatic stop condition met until when the engine is automatically restarted with an automatic restart condition met. Only when the engine cannot be restarted even though the engine restart condition is met after the same is automatically stopped, the vehicle electronic control device stores the nonvolatile memory storage objective data preliminarily stored in the volatile memory in the nonvolatile memory as a reason for unsuccessful engine restart.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an electronic control device for a vehicle, and more particularly to an electronic control device for a vehicle that controls automatic stop and automatic restart of an engine.

  In recent vehicles, in order to improve fuel efficiency, what is called idling stop that automatically stops the engine when the vehicle stops is increasing. This automatic engine stop is executed when a preset automatic stop start condition is satisfied. Examples of the automatic stop start condition include all conditions such as a brake operation and an accelerator operation. Generally, it is set to satisfy the above.

  In order to automatically restart the engine from the automatic engine stop state (idling stop state), an automatic restart condition is set in advance. This is when any one of the automatic stop conditions is not satisfied. (For example, when the accelerator is depressed or the brake operation is released).

  By the way, the arithmetic unit included in the electronic control device that is mounted on the vehicle and controls the automatic stop and automatic restart of the engine (idling stop control) may stop the idling stop control due to occurrence of various circumstances. Further, an unexpected situation may occur in which the engine does not restart even though the automatic restart condition is satisfied. In such a case, the user or mechanic needs to investigate the factors as to why such a situation has occurred. Therefore, the electronic control device records the factor of the stop in the storage unit, displays the factor recorded in the storage unit on the display unit, and informs the user and the mechanic of the factor. As a result, the identified factors can be repaired immediately, leading to improved safety as a vehicle.

  Conventional techniques relating to such a technique are disclosed in Patent Documents 1 and 2.

  In Patent Document 1, the reason why the engine is not automatically stopped or the reason why the engine is automatically restarted is stored by storing the reason for prohibiting automatic stop when the engine is automatically stopped when the vehicle is stopped or the reason for automatically restarting the engine. An automatic engine stop device for a vehicle that can grasp the above is disclosed.

  Patent Document 2 discloses data stored in a non-volatile memory among data stored in a volatile memory between the time when an automatic stop condition is satisfied and the time when the engine is restarted when the automatic start condition is satisfied. A vehicle electronic control device is disclosed in which non-volatile memory storage target data, which is preset data, is stored in a non-volatile memory, thereby suppressing data update omission.

JP 2014-047637 A JP 2012-241645 A

  Incidentally, the item of the engine automatic stop condition includes the engine automatic restart condition, and the information is often determined at the time when the engine automatically stops. For this reason, after the vehicle stops and the engine is automatically stopped by the engine automatic stop condition, the vehicle situation may change depending on the passage of time or the environment change until the automatic restart condition is satisfied. The engine cannot be automatically restarted from the automatic stop due to the battery voltage drop or the occurrence of a malfunction of the parts that start the engine. In the worst case, the engine stops. Problems may occur.

  In addition, even if the engine automatic restart condition is satisfied, if the engine cannot be recovered from the automatic stop (automatic restart), whether the cause is a problem caused by starting parts such as a battery or a starter, It is difficult to easily identify the cause of the problem caused by the microcomputer of the vehicle electronic control unit (ECU).

  In such a case, measures such as replacing sensor parts and ECUs due to engine stalls that originally did not need to be replaced may be taken.

  Further, in a vehicle having an idling stop function, generally, the number of engine restarts (that is, the number of crankings) is larger than that of a vehicle not having an idling stop function. For this reason, if the state and information at that time are stored in the non-volatile memory each time the restart is repeated (the automatic restart condition is satisfied), there is a problem that the limit of the guaranteed number of write times of the non-volatile memory is exceeded.

  The present invention has been made in view of the above problems, and its object is to replace sensor parts and ECUs that originally need not be replaced while suppressing consumption of the nonvolatile memory. It is an object of the present invention to provide an electronic control device for a vehicle that can prevent the occurrence of problems and can quickly determine that there is no problem in the program of the microcomputer of the ECU.

  In order to solve the above-described problems, an electronic control device for a vehicle according to the present invention automatically stops the engine when the vehicle is stopped when a preset automatic stop condition is satisfied, takes an idling stop state, and automatically controls the engine. A vehicle electronic control device mounted on a vehicle having an idling stop function for restarting the engine when a preset automatic restart condition is satisfied after stopping, and a volatile memory capable of reading and writing data; The non-volatile memory capable of rewriting stored contents and the state or information at that time only when the engine could not be automatically restarted despite the fact that the engine was automatically restarted after the engine was automatically stopped Storage means for storing in a non-volatile memory.

  According to the present invention, by confirming the storage contents stored in the nonvolatile memory as the storage unit, it is possible to detect an abnormality or failure of the vehicle at an early stage, and parts that are not required to be replaced are replaced. Can be prevented, and fail-safe treatment can be performed. Further, it can be determined early that no abnormality has occurred in the microcomputer of the ECU.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a configuration diagram of an embodiment of an electronic control device (ECU) for a vehicle according to the present invention and peripheral devices thereof. It is the figure explaining an example of the engine automatic stop conditions and engine automatic restart conditions in the idling stop control by ECU shown in FIG. It is a flowchart which shows an example (when the engine automatic stop and automatic restart are normally performed) by the ECU shown in FIG. It is a timing chart which shows one operation example (when the engine automatic stop and automatic restart are normally performed) by the ECU shown in FIG. It is a figure which shows the list | wrist of the parameter memorize | stored after idling stop, and its classification | category. It is a flowchart which shows an example of the idling stop control by ECU shown in FIG. 1 (when automatic restart is not normally performed after the engine is automatically stopped). 2 is a timing chart showing an example of an operation of idling stop control by the ECU shown in FIG. 1 (when automatic restart is not normally executed after the engine is automatically stopped).

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an electronic control device for a vehicle according to the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram showing an ECU 100 and its peripheral devices, which are an embodiment of a vehicle electronic control device according to the present invention.

  The ECU 100 according to the present embodiment is mounted on a vehicle, and as shown in FIG. 1, basically, a microcomputer (hereinafter sometimes referred to as a microcomputer for short) 110, an input / output circuit 200, and a starter drive circuit. 201.

  Among these, the microcomputer 110 is a well-known microcomputer including a CPU 111 as a calculation unit, a ROM 112, a RAM 113, a BuRAM 114 as a volatile memory, an I / O 115, an EEPROM 116 as a nonvolatile memory, and a bus line connecting them. It is a computer, and executes various processes for controlling the engine based on control programs stored in the ROM 112, the RAM 113, and the BuRAM 114. Here, the BuRAM 114 is a volatile memory capable of reading and writing data, and the EEPROM 116 is a non-volatile memory capable of rewriting data (memory contents), and is connected to the CPU 111 so as to be able to input and output data. Has been.

  In addition, the input / output circuit 200 includes an air conditioner switch 204, an accelerator opening sensor 205, a throttle opening sensor 206, an airflow sensor 207, a water temperature, an intake air temperature, an oil temperature, and a fuel as various external signals for controlling the engine. Detection signals are input from each temperature sensor 208 such as temperature, vehicle speed sensor 209, brake switch 210, cam angle sensor 211, crank angle sensor 212, etc., and engine control (to igniter 221 or injector 220) based on the vehicle running state. Execute the drive signal). The input / output circuit 200 is communicably connected to another control device (C / U) 230 via a CAN (Controller Area Network), a LIN (Local Area Network), or the like.

  The starter drive circuit 201 outputs a starter drive signal for driving the starter 202 that starts the engine in response to the supply of the battery voltage VB from the battery 203 based on the starter control signal from the microcomputer 110.

  The ECU 100 detects the state and information of the vehicle and the operation state and operation information of the driver from each C / U and each sensor, and performs engine control (idling stop control) of idling stop. In the present specification, the idling stop control automatically stops / restarts the engine during idling, and reduces unnecessary idling when the vehicle stops, such as waiting for traffic lights or traffic jams. This control is aimed at reducing exhaust gas and suppressing noise.

  FIG. 2 explains an example of the engine automatic stop condition and the engine automatic restart condition in the idling stop control by the ECU 100 shown in FIG.

Here, the detection contents of each sensor for detecting a signal necessary for the engine automatic stop control will be described in association with the engine automatic stop condition or the engine automatic restart condition. The engine automatic stop condition detects a decrease in vehicle speed, stops the engine, detects a driver's start operation, and automatically restarts the engine. The engine automatic stop condition is not satisfied if any of the following conditions is satisfied. The engine automatic restart condition is included in the engine automatic stop condition.
(1) In relation to the engine, when the cooling water temperature is not within the predetermined temperature range, when the intake air temperature is too high, or when the atmospheric pressure is low.
(2) In relation to the air conditioner, when the indoor air conditioning requirement is large (when the set air volume is large and the deviation between the actual temperature and the manually set temperature is large), the outside air temperature is extremely hot or cold. When the temperature.
(3) When the brake negative pressure is insufficient or the accelerator pedal is depressed. When an engine system error signal is generated.
(4) When the idling stop switch for canceling (prohibiting) the automatic engine stop by the driver's intention is ON.
(5) When the engine speed is a high speed equal to or higher than a preset speed (a rotational speed that is considerably higher than the idling speed when stabilized).
(6) In relation to the battery, when the charge amount is less than or equal to a preset predetermined charge amount, when the current consumption is greater than or equal to a preset predetermined current, or when the battery control system is abnormal (the abnormal signal is When it occurs).
(7) When the vehicle speed is equal to or higher than a predetermined speed.
(8) When abnormality or failure occurs in each sensor.
(9) When the steering angle by the driver is not within a predetermined small steering angle range from the neutral position.
(10) In relation to the transmission, when the oil temperature is not within a predetermined temperature range, when the hydraulic pressure is not within a predetermined pressure range, when a transmission abnormality signal is generated, a clutch (including a lock-up clutch) When there is an abnormality.
(11) When the inclination angle of the road surface is large.
(12) When the ignition key is taken out of the vehicle (in the case of a smart keyless entry system), the driver's seat belt is removed, or the driver door is open (driver) When getting off), the hood is open.

  Of course, the automatic stop condition is an example, and other conditions may be set as the automatic stop prohibition condition or a part of the condition may be deleted. In addition, for example, the automatic stop prohibition condition caused by the driver's operation such as not operating the brake, the steering angle of the steering wheel being almost in the neutral position, or not operating the accelerator is clearly recognized by the driver. It can be done. On the other hand, the battery charge amount, the temperature of the transmission, and the like cannot be recognized immediately by the driver.

  In the ECU 100 configured as described above, the microcomputer 110 automatically stops the engine when the preset engine automatic stop condition is satisfied and takes the idling stop state, and the engine 110 when the preset engine automatic restart condition is satisfied. The idling stop control process for restarting the engine is executed (idling stop function). As the idling stop condition in the present embodiment, the vehicle speed based on the detection signal from the vehicle speed sensor 209 may not be 0 km / h (that is, complete stop).

  Further, the microcomputer 110 determines whether or not the automatic restart condition is satisfied after the engine is automatically stopped by the idling stop control. When the automatic restart condition is satisfied, the microcomputer 110 clears the engine stop flag and automatically restarts the engine. The restart request process for setting the engine stop flag when the condition is not satisfied is configured to be executed every time a preset processing cycle elapses.

<When the engine is automatically stopped and restarted normally>
FIG. 3 is a flowchart showing an example when the automatic stop and automatic restart of the engine are normally executed by the idling stop control by the ECU 100 shown in FIG. This idling stop control process is a process repeatedly executed while the microcomputer 110 is activated (powered on).

  When the idling stop control process is executed, the microcomputer 110 first determines in S400 whether or not an automatic stop condition is satisfied. Here, when the automatic stop condition is not satisfied, the idling stop control is temporarily ended. On the other hand, if the automatic stop condition is satisfied, the engine is stopped in S401.

  Next, in S402, it is determined whether or not an automatic restart condition is satisfied. Here, when the automatic restart condition is not satisfied, the automatic restart condition is periodically and repeatedly determined (S402). On the other hand, if the automatic restart condition is satisfied, the engine is restarted in S403.

  FIG. 4 is a timing chart showing an operation example when the automatic stop and automatic restart of the engine are normally executed by the idling stop control by the ECU 100 shown in FIG. FIG. 5 shows a list of parameters to be stored continuously when the engine is automatically stopped after the automatic stop condition is satisfied (after idling stop) and its classification. Here, each parameter (value) is the parameter information (automatic stop condition and automatic restart condition) related to the restart from the automatic engine stop after the automatic stop condition is satisfied to the engine restart after the automatic restart condition is satisfied. As the value of each parameter used and the value of each parameter for operating the starting parts required for restarting the engine, engine state parameters (normal, engine stall, fail safe) and starting part parameters (Normal and engine stall), vehicle state parameters, and ECU parameters are classified.

  In FIG. 4, if the vehicle speed decreases from the running state and then the automatic stop condition is satisfied, the engine is automatically stopped at time t1, and accordingly, the engine speed is decreased from the idle speed to zero. At this time, the BuRAM storage permission flag is set, and each vehicle information (value of each parameter) shown in FIG. 5 is stored continuously (continuously) in the BuRAM 114.

  At time t2, the automatic restart condition is satisfied, the engine is automatically restarted, and the engine speed is increased to the idle speed. At this time, if the engine is automatically restarted, the vehicle information stored in the BuRAM 114 remains unchanged.

<When automatic restart is not executed normally after the engine stops automatically (when an idling stop stall occurs)>
On the other hand, FIG. 6 is a flowchart showing an example when an engine stall occurs when the automatic restart condition is satisfied after the engine is automatically stopped by the idling top control by the ECU 100 shown in FIG. 1 (when automatic restart is not normally executed). is there. This idling stop control process is a process repeatedly executed while the microcomputer 110 is activated (powered on).

  When the idling stop control process is executed, the microcomputer 110 first determines in S410 whether or not an automatic stop condition is satisfied. Here, when the automatic stop condition is not satisfied, the idling stop control is temporarily ended. On the other hand, if the automatic stop condition is satisfied, an engine stop flag is set in S411, and the engine is stopped in S412. At this time, the value of each parameter shown in FIG. 5 is temporarily stored in the BuRAM 114 in S413.

  Next, in S414, it is determined whether or not an automatic restart condition is satisfied. Here, when the automatic restart condition is not satisfied, the automatic restart condition is periodically and repeatedly determined (S414). On the other hand, if the automatic restart condition is satisfied, the engine stop flag is cleared in S415, the engine is restarted in S416, and the values of the parameters shown in FIG. 5 are temporarily stored in BuRAM 114 in S417. Remember it. At this time, it is determined in S418 whether or not the engine has been reliably restarted. If the engine restarts normally without an engine stall, the process ends. On the other hand, if some abnormality has occurred and the engine has not been restarted normally, the number of engine stalls established during idle stop control is incremented in S419, and the value stored in BuRAM 114 in S413 and S417 in S420. It memorize | stores in EEPROM116 and the said process is complete | finished.

  FIG. 7 shows a case where the engine has not been restarted for some reason after the engine is automatically stopped by the idling top control by the ECU 100 shown in FIG. It is a timing chart which shows an example of 1 operation).

  In FIG. 7, if the vehicle speed decreases from the running state and then the automatic stop condition is satisfied, the engine is automatically stopped at time t1, and accordingly, the engine speed is decreased from the idle speed to zero. At this time, as described above, the BuRAM storage permission flag is set, and each vehicle information (value of each parameter) shown in FIG. 5 is temporarily (continuously) stored in the BuRAM 114 as engine automatic stop time information. .

  At time t2, the automatic restart condition is satisfied and the engine should be automatically restarted. However, the engine does not restart for some reason, and a so-called engine stall occurs.

  At this time, the BuRAM storage permission flag is set, and the parameters of FIG. 5 that are constantly monitored are stored in the BuRAM 114 in another area as the engine stall information when the engine restart condition is satisfied, It is stored in the EEPROM 116 as engine stall information when the engine restart condition is satisfied. In addition, in order for the mechanic to reliably grasp the occurrence phenomenon of engine stall when the engine restart condition is satisfied during vehicle maintenance, the number of occurrences is also stored in the EEPROM 116 for each reason. As a result, information on each state parameter when the engine automatic stop condition is satisfied, information on each state parameter when the engine stall occurs when the automatic restart condition is satisfied, and the number of occurrences can be reliably stored, and the cause of the engine stall can be investigated early. be able to.

  As described above, the vehicle electronic control unit (ECU) 100 according to the present embodiment stops the engine to take an idling stop state when a preset automatic stop condition is satisfied when the vehicle is stopped, and in advance after the engine is automatically stopped. A volatile memory (BuRAM) that can be read and written to data and a non-volatile memory that can be rewritten is installed in a vehicle having an idling stop function that restarts the engine when the set automatic restart condition is satisfied. A memory (EEPROM) is provided, and the storage means (CPU) until the engine restarts when the automatic restart condition is satisfied after the engine is automatically stopped when the automatic stop condition is satisfied (becomes an idling stop state). Of data stored in volatile memory during non-volatile memory Continuously storing a preset non-volatile memory storage target data is data (various parameters) in the volatile memory as over data.

  After that, when the automatic restart condition cannot be established despite the automatic restart condition being satisfied after the engine is automatically stopped, the storage means stores the nonvolatile memory previously stored in the volatile memory as the reason. Memory storage target data is stored in a nonvolatile memory. If the automatic restart can be performed without any problem as usual, the non-volatile memory storage target data stored in the volatile memory is not stored in the non-volatile memory because of the limitation on the number of times the non-volatile memory is rewritten.

  By adopting such a configuration, when automatic restart is not possible at the time of automatic restart after automatic engine stop of the idling stop function while suppressing consumption of the non-volatile memory, automatic restart that has been unknown in the past is not possible. The reason why the engine does not start can be stored, and the occurrence of a situation where a vehicle part such as a sensor that does not need to be replaced is replaced can be suppressed. Furthermore, it can be confirmed at an early stage that there is no problem in the microcomputer of the ECU 100.

  Further, as shown in FIG. 5, the vehicle electronic control unit (ECU) 100 according to the present embodiment includes each return element parameter of vehicle information necessary for automatic restart and a start-related necessary for starting the engine. Each starting element parameter of the component is stored in the volatile memory separately for each data type to be stored.

  With such a configuration, in order to start the engine, it was a factor related to the operation of the driver, whereas the engine could not be automatically restarted despite the automatic restart condition being satisfied. It is possible to easily distinguish whether the factor is related to the start-up related parts, and it is possible to reliably suppress the occurrence of a situation in which related parts that are originally unnecessary to be replaced are replaced.

  Further, in the vehicle electronic control unit (ECU) 100 of the present embodiment, when the storage means satisfies the automatic stop condition as shown in FIG. 5 and the engine cannot be automatically restarted after the engine is automatically stopped. As the microcomputer information of the ECU 100, calculation load, reset information, ROM abnormality information, RAM abnormality information, and stack area information are stored. In addition, idling stop control in the program and function call coverage of functions related to starting are also stored.

  With such a configuration, the engine could not be restarted despite the fact that the automatic restart condition was satisfied, but when the ECU 100 program investigation occurred, it was confirmed that there was no abnormality in the microcomputer for a short time. Can be proved by

  Further, in the vehicle electronic control unit (ECU) 100 according to the present embodiment, the storage means, as shown in FIG. 5, satisfies the automatic stop condition, and the engine cannot be automatically restarted after the engine is automatically stopped. As the communication information of the ECU 100, information of each C / U including CAN, LIN, etc. and communication timing information are stored.

  With such a configuration, the engine could not be restarted despite the automatic restart condition being satisfied, whereas it was a factor related to the operation of the driver of the ECU, or the start for starting the engine It is possible to distinguish whether the factor is related to the related component, and it is possible to more reliably suppress the occurrence of a situation in which the related component that is originally not required to be replaced is replaced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range described in the claim, an appropriate change is possible. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  Further, the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files that realize each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  Further, the control lines and information lines are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  100: ECU (electronic controller for vehicle), 110: microcomputer (microcomputer), 111: CPU, 112: ROM, 113: RAM, 114: BuRAM (volatile memory), 115: I / O, 116: EEPROM ( (Nonvolatile memory), 200: input / output circuit, 201: starter drive circuit, 202: starter, 203: battery, 204: air conditioner switch, 205: accelerator opening sensor, 206: throttle opening sensor, 207: airflow sensor, 208 : Temperature sensors, 209: vehicle speed sensor, 210: brake switch, 211: cam angle sensor, 212: crank angle sensor, 220: injector, 221: igniter, 230: other C / U (control device)

Claims (5)

When the vehicle is stopped, when the preset automatic stop condition is satisfied, the engine is automatically stopped to take the idling stop state, and when the preset automatic restart condition is satisfied after the engine is automatically stopped, the engine is restarted. An electronic control device for a vehicle mounted on a vehicle having a stop function,
Volatile memory that can read and write data, non-volatile memory that can rewrite stored data, and automatic restart of the engine even if the automatic restart condition is satisfied after the engine is automatically stopped An electronic control device for a vehicle, comprising: storage means for storing the state or information at that time in the nonvolatile memory only when there is no such information. The vehicle electronic control device according to claim 1,
The storage means is required to restart the engine and the values of the parameters used as the automatic stop condition and the automatic restart condition after the idling stop state is established due to the establishment of the automatic stop condition. An electronic control device for a vehicle, wherein values of parameters for operating a starting component are continuously stored in the volatile memory. The vehicle electronic control device according to claim 2,
The storage means stores the value of each parameter stored in the volatile memory in the non-volatile memory when the automatic restart of the engine cannot be performed despite the automatic restart condition being satisfied. A vehicular electronic control device. The vehicle electronic control device according to claim 1,
The electronic control device for vehicles, wherein the storage means stores the number of occurrences for each reason why the engine could not be automatically restarted after the engine was automatically stopped. The vehicle electronic control device according to claim 1,
The storage means includes, as microcomputer information of the electronic control unit, microcomputer load of the electronic control unit at the time of restart after the engine is automatically stopped and at the time of stall, calculation error, reset information, ROM abnormality information, RAM abnormality information, stack area information, The vehicle electronic control device is characterized in that the function call coverage is stored and / or the information and communication timing of each control device including CAN and LIN are stored as communication information of the electronic control device.

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