JP6442326B2 - Vehicle control device - Google Patents

Description

  The present invention relates to a vehicle control apparatus, and more particularly, to a vehicle control apparatus having a nonvolatile memory storage method.

  For example, Japanese Patent Application Laid-Open No. 2004-228561 has a data storage method means that stores defect data and registers it in a nonvolatile memory at the same time. As a storage method, there are at least two storage areas, one of which is used when the first malfunction occurs and is permanently stored, and the other area is rewritten and used every time a malfunction occurs.

JP 2005-41273 A

  However, when multiple factors are related to one defect data, the technology of the above-mentioned patent document can leave the data at the time of the defect occurrence, but an instantaneous drop etc. occurred and the microcomputer restarted In this case, since data is written from the non-volatile memory to the defect storage area, there is a disadvantage that it is inconsistent with the data at the time of the first defect occurrence and the defect registration information stored in the volatile memory that is not cleared when the normal ignition is specified by OBD. is there.

  Therefore, the present invention has an object to propose a vehicle control device that eliminates inconsistency between information stored in the volatile memory and information in the non-volatile memory when an instantaneous drop occurs in data stored at the time of the first malfunction. And

  In order to solve the above-described problems, the present invention detects an abnormality on the basis of signals from various sensors or actuators of a vehicle and stores the detection result in a volatile storage device, and holds And a non-volatile memory storage means for storing in a non-volatile storage device that is stored even if the supply of power for the vehicle is interrupted. Is stored in the volatile storage device, and the nonvolatile memory storage means stores the storage data in the nonvolatile storage device at a prescribed timing, and the nonvolatile storage device The storage data read from is not stored in the volatile storage device.

  Preferably, the volatile memory storage means stores the stored data when the state of the volatile storage device is confirmed and the nonvolatile memory storage means confirms the state of the nonvolatile storage device and can determine that writing is possible. .

  In addition, it is desirable that the volatile storage device and the nonvolatile storage device can store the stored data only in an initial state where the stored data is not stored.

  Further, in the state in which the storage data is stored in the volatile storage device, the storage data is stored in the nonvolatile storage device unless the nonvolatile storage device stores the storage data. It is desirable to ban.

  Further, based on the detection factor of the stored data, the non-volatile memory storage unit stores all detection factors at a storable timing, and minimizes the cost required for storage by using the logical OR of the data. It is desirable to make it.

  Further, the volatile memory storage means is used at the time of detecting each abnormality, and the latest abnormality detection information is stored in a volatile storage device, and the abnormality detection information is stored at a timing that can be stored by the nonvolatile memory storage means. It is desirable that the data can be stored in the nonvolatile storage device.

  According to the above solution of the present invention, it is possible to clearly find out the factor at the first occurrence of the data for creating one defect data from a plurality of factors, guarantee the relevance with the stored defect data, Efficiency can be improved.

1 is a schematic diagram of a spark ignition internal combustion engine and a control device according to the present invention. The internal block diagram of a control unit. The control block diagram explaining the structure of the Example of this invention Data allocation diagram for explaining data allocation in an embodiment of the present invention A flowchart showing a method of storing NG factors in a nonvolatile memory when NG occurs Flow chart showing the first NG factor storage processing method Flow chart showing NG factor history processing method Flow chart showing the latest NG factor storage processing method Flowchart showing nonvolatile memory write processing method

  Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to a vehicle control device, and includes a nonvolatile memory storage means, and in particular, links a factor when one label operation due to a plurality of factors is not erased by a power supply, and a timing and factor when the one existing label is changed. It is related with what makes NG cause investigation easy.

  The control device according to the present embodiment is mounted on a vehicle, detects an abnormality based on signals from various sensors or actuators of the vehicle, and stores the detection result in a volatile storage device of the microcomputer (hereinafter referred to as “the control device”). And a means for storing in a non-volatile storage device (hereinafter referred to as “non-volatile memory storage means”) that is stored even if the supply of holding power is interrupted. The control device also relates to a storage method for storing, in a storage device, information (hereinafter referred to as “stored data”) that is managed in a state where a plurality of detection factors are associated with one abnormal event. The storage data is stored by the memory storage means, the factors of the storage data are individually stored, the storage data is stored in the nonvolatile storage device at a predetermined timing by the nonvolatile memory storage means, and the nonvolatile storage The storage data read from the storage device is not stored in the volatile storage device.

  In other words, when there is a microcomputer storage memory and non-volatile memory to save the failure status, when the first failure occurs, it is saved to the microcomputer storage memory where the failure status is saved only for the first time, and then a failure occurs while the same ignition key is ON Do not let me save. Saving to the non-volatile memory is performed when the ignition key is OFF. When the ignition key is turned on the next time, the microcomputer memory can be overwritten to the previous value without saving from the nonvolatile memory to the microcomputer memory.

  In this configuration, when fault data is generated, the factor and the data at the time when the fault data is registered can be stored in the microcomputer storage memory, so that the first factor can be clarified when the fault data occurs multiple times. Since the data is written to the non-volatile memory when the ignition key is turned off, the backup RAM is erased even if the power is removed in this case, but there is something stored in the non-volatile memory, which is useful for cause analysis. Become.

  In addition, since the timing of saving to the non-volatile memory is when the ignition is off, the malfunction data is also erased when a malfunction occurs and the microcomputer storage memory disappears for some reason before the ignition is turned off. Therefore, it is possible to maintain data consistency.

  In the control device of this embodiment, the memory storage unit is a volatile storage device, and the nonvolatile memory storage unit checks the state of the nonvolatile storage device, and stores the stored data when it can be determined that writing is possible. It is desirable. As described above, when the first defect occurs, only the first defect is stored, and subsequent defects are not stored, so that it is possible to maintain the relationship with the stored data defined by the OBD regulations.

  Further, the control device according to the present embodiment enables the storage data to be stored only in the initial state in which each storage device does not store the storage data, that is, the storage data is stored in the volatile storage device. Even if the non-volatile storage device is in the initial state, it is desirable to prohibit the storage data from being stored in the non-volatile storage device. By storing the occurrence history in this way, it is possible to determine whether there is one cause or a plurality of causes even if the same failure occurs, and it can be used for countermeasures against the cause.

  Further, the control device according to the present embodiment stores all detection factors at a storable timing by the nonvolatile memory storage unit based on the detection factors of the stored data stored by the memory storage unit, and the logic of the data. It is desirable to minimize the cost required for storage by using sums. By storing the latest defect data in this manner, it is possible to analyze the latest defect state while comparing the stored contents of claims 2 and 3 with a state in which the latest defect has occurred in the past.

  Furthermore, in the control device of the present embodiment, the memory storage unit is used at the time of detecting each abnormality, and the latest abnormality detection information is stored in the volatile storage device, and at the timing that can be stored by the nonvolatile memory storage unit, It is desirable to have means for storing the abnormality detection information in a nonvolatile storage device.

  In other words, according to the above contents, when trouble data occurs, the cause and the data at the time when trouble data was registered can be saved in the microcomputer storage memory, and the first cause can be clarified when trouble data occurs multiple times. Since the data is written to the non-volatile memory when the key is turned off, the backup RAM is erased even if the power is turned off in this case, but there is something stored in the non-volatile memory, which is useful for cause analysis. .

  In addition, since the timing of saving to the non-volatile memory is when the ignition is off, the malfunction data is also erased when a malfunction occurs and the microcomputer storage memory disappears for some reason before the ignition is turned off. Therefore, it is possible to maintain data consistency.

  FIG. 1 is a basic configuration diagram of a spark ignition internal combustion engine and its control device according to the present invention. In the following description, the description will be given using a cylinder injection type spark ignition internal combustion engine. However, a port injection type spark ignition internal combustion engine and a dual injection type spark ignition internal combustion engine equipped with both cylinder injection and port injection. It is also applicable to.

In the figure, the engine 1 is provided with a piston 2, an intake valve 3, and an exhaust valve 4. The intake air passes through an air flow meter (AFM) 18 and enters a throttle valve 17, and is taken in from a collector 14 which is a branch portion. It is supplied to the combustion chamber 19 of the engine 1 through the pipe 10 and the intake valve 3. The fuel is injected and supplied from the fuel injection valve 5 to the combustion chamber 19 of the engine 1 and ignited by the ignition coil 7 and the spark plug 6. The exhaust gas after combustion is discharged to the exhaust pipe 11 through the exhaust valve 4, and the exhaust pipe 11 is provided with a three-way catalyst 12 for purifying the exhaust gas. The engine control unit 9 includes a signal of the crank angle sensor 15 of the engine 1, an air amount signal of the AFM 18, a signal of the air-fuel ratio sensor 13 for detecting the air-fuel ratio in the exhaust gas, an accelerator opening of the accelerator opening sensor 20, and the like. A signal is input. The engine control unit 9 calculates the required torque to the engine from the signal of the accelerator opening sensor 20, determines the idling state, etc., calculates the intake air amount necessary for the engine 1, and calculates the opening signal corresponding to the intake air amount. 17 to output. A fuel injection signal is output to the fuel injection valve 5 and an ignition signal is output to the spark plug 6.
Further, a knock sensor 8 attached to the engine 1 detects an abnormal sound (knocking) generated during abnormal combustion of the engine 1 and feedback controls the ignition signal.

FIG. 2 shows the internal configuration of the engine control unit 9.
The engine control unit 9 includes a microcomputer including an input circuit 201, an A / D conversion unit 202, a central processing unit 203, a ROM 204, a RAM 205, a nonvolatile memory 208, and an output circuit 206. When the input signal 200 is an analog signal (for example, a signal from the AFM 18, the accelerator opening sensor 20, etc.), the input circuit 201 removes a noise component from the signal and outputs the signal to the A / D converter 202. Is to do.

The central processing unit 203 has a function of executing each control, diagnosis, and the like by fetching the A / D conversion result and executing a fuel injection control program and other control programs stored in a medium such as the ROM 204. Yes. The calculation result and the A / D conversion result are temporarily stored in the RAM 205, and the calculation result is output as a control signal 207 through the output circuit 206 and used for controlling the fuel injection valve 5, the ignition coil 7, and the like. It is done.
FIG. 3 is a control block diagram illustrating this embodiment.

  Parameters relating to engine operation are acquired by the input value processing means 301. Each input value NG detection unit 302 determines whether or not the input value is abnormal with respect to the acquired input value. Further, the microcomputer operation determination processing means 303 determines whether or not the microcomputer is operating normally. Stored data 311 at the time of occurrence of NG that collectively stores the determination as NG by each input value NG detection unit 302 or the microcomputer operation determination processing unit 303 as one stored data. As a destination for storing the generation factor of the NG generation storage data 311, an NG first generation factor storage unit 304 that stores when the NG generation is the first time, an NG generation factor history storage unit that stores a history of the NG generation factor 305, latest NG factor storage means 306 as a storage destination of the latest NG occurrence factor.

  Information from the ignition SW ON ← → OFF recognition unit 307 and the storage factor data clear unit 308 is captured in order to store the data of the NG first generation factor storage unit 304, the NG generation factor history storage unit 305, and the latest NG factor storage unit 306. NG generation backup RAM writing means 309 for controlling the writing method, and finally the data saving method for saving in the nonvolatile memory is taken in the information from the ignition SW ON ← → OFF recognition means 307 and the storage factor data clear means 308 And a non-volatile memory writing means 310 for controlling.

  FIG. 4 shows the configuration of data used in the NG first generation factor storage unit 304, the NG generation factor history storage unit 305, the latest NG factor storage unit 306, and the nonvolatile memory writing unit 310. The data structure used by the NG first generation factor storage unit 304 is indicated by 401 in the backup RAM area for the first NG history. The configuration content 401 includes a storage area for each factor and a storage timing information area for storing the timing at which the factor is stored. The data structure of the nonvolatile memory area 402 for the initial NG history is the same as 401. The data structure used by the NG occurrence factor history storage unit 305 is indicated by reference numeral 403 in the backup RAM area for the occurrence NG history. The configuration content 403 is only a storage area for each factor. The data structure of the non-volatile memory area 404 for generated NG history is the same as that of 403. The data structure used by the latest NG factor storage means 306 is shown in the backup RAM area 405 for the latest NG history. The configuration content 405 includes a storage area for each factor and a storage timing information area for storing the timing at which the factor is stored. The data structure of the nonvolatile memory area 406 for the latest NG history is the same as that of 405.

  The operation method will be described with reference to flowcharts in FIG. In step 501, it is determined whether a backup data area clear command has been input. If it is determined that the data has been input, the process proceeds to step 502 to clear the data in the backup RAM area 401, 403, and 405 described above. Thereafter, the process proceeds to step 507. If the clear command has not been input, the process proceeds to step 503 for detecting NG. When NG is detected here, the initial NG factor storage process in step 504 (operation is shown in FIG. 6), the NG factor history process in step 505 (operation is shown in FIG. 7), and the latest NG factor storage process in step 506 ( The operation is shown in FIG. Then go to step 507. If there is no NG detection in step 503, the process proceeds to step 507 as it is. In step 507, it is determined whether the ignition SW is OFF. In the case of OFF, the non-volatile memory writing process (the operation is shown in FIG. 9) in step 508 is performed. If the ignition SW is not OFF, this operation is finished as it is.

  FIG. 6 shows the initial NG factor storage process. In FIG. 5, when the execution of the initial NG factor saving process is called, step 601 is executed. In step 601, it is determined whether or not NG has already been registered in the initial NG storage area. If it is registered, the process is terminated. If not registered, the process moves to step 602 to store the initial NG storage backup RAMNG factor. When the storage is completed, the process moves to step 603 to store information for linking with the data stored when NG occurs as shown in FIGS. 3 and 311 (time after engine start, number of times of ignition SW ON / OFF, etc.). Exit after saving.

  FIG. 7 shows the processing of the NG factor history processing. In FIG. 5, when the NG factor history process is called, step 701 is performed. In step 701, it is determined whether it is an NG code to be stored. If it is an NG code to be stored, this processing is terminated, and if it is data to be stored, whether or not f moving to step 702 is registered. Perform the determination. If it is registered, the process is terminated. If not registered, the process moves to step 602 to store the initial NG storage backup RAMNG factor. When the storage is completed, the process moves to step 603 to store information for linking with the storage data at the time of occurrence of NG shown by 311 in FIG. 3 (time after engine start, number of times of ignition SW ON / OFF, etc.) The process ends.

  FIG. 8 shows the latest NG factor storage process. In FIG. 5, when the latest NG factor saving process is called, step 801 is executed. In step 801, it is checked whether other factors are already stored in the latest NG storage backup RAM area. If not stored, the process proceeds to step 802, the generated NG factor is stored in the latest NG history backup RAM, and the process proceeds to step 805. If any factor is stored in the backup RAM area in step 801, the process proceeds to step 803. In step 803, since the purpose is to save only the latest NG factor, the backup area for saving the latest NG is cleared. Thereafter, the process proceeds to step 804, where the latest value is stored in the cleared latest NG storage backup RAM area. After saving, the process proceeds to step 805. In step 805, information for linking to the data stored at the time of occurrence of NG indicated by 311 in FIG. 3 (time since engine start, number of times of ignition SW ON / OFF, etc.) is stored, and this processing is terminated.

FIG. 9 describes the nonvolatile memory writing process. In FIG. 5, when the latest NG factor storage process is called, step 901 is performed. In step 901, it is determined whether other factor data is already stored in the initial NG storage data in the non-volatile area. If it is stored, step 903 is executed. If it is determined that it is not stored, the process proceeds to step 902. In 902, in order to save the initial NG occurrence factor, the initial NG saving data in the backup RAM area is saved as the NG factor saving data in the nonvolatile memory area. After saving, the process proceeds to step 903.
In step 903, in order to save the NG history in the nonvolatile memory, the factor storage area 404 for the generated NG history and the factor for the generated NG history in the backup RAM area are transferred to the factor storage area 404 for the generated NG history in the nonvolatile memory area. An OR (logical sum) with the storage area 403 is stored. This makes it possible to accumulate NG generation factor histories. After saving, the process proceeds to step 904. In step 904, the latest NG data is stored in the non-volatile memory, and the factors and timing information 405 stored in the latest NG storing data in the backup RAM area are stored in the non-volatile memory area. Save to 406. After saving, this process is terminated.

As mentioned above, although one Embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, In design, without deviating from the mind of this invention described in the claim Various changes can be made.

DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Piston 3 ... Intake valve 4 ... Exhaust valve 5 ... Fuel injection valve 6 ... Spark plug 7 ... Ignition coil 8 ... Knock sensor 9 ...・ ECU (Engine Control Unit)
DESCRIPTION OF SYMBOLS 10 ... Intake pipe 11 ... Exhaust pipe 12 ... Three-way catalyst 13 ... Air-fuel ratio sensor 14 ... Collector 15 ... Crank angle sensor 16 ... Signal plate 17 ... Throttle valve 18 ... AFM
19 ... Combustion chamber 20 ... Accelerator opening sensor

Claims (6)

Volatile memory storage means for detecting an abnormality based on signals from various sensors or actuators of the vehicle and storing the detection result in a volatile storage device;
In a vehicle control device comprising: a non-volatile memory storing means for storing in a non-volatile storage device that is stored even if supply of holding power is interrupted,
By the volatile memory storage means, stored data associated with a plurality of detection factors for one abnormal event is stored in the volatile storage device,
The volatile storage device is a backup RAM area that is an area for storing the storage data by the volatile memory storage means ,
The backup RAM area includes a nonvolatile memory area access memory area for storing the storage data to be stored in the nonvolatile storage device by the nonvolatile memory storage means, and an area for storing storage data when an NG occurs. , has a,
The non-volatile memory storage means stores the storage data of the non-volatile memory area access memory area in the non-volatile storage device at a specified timing,
The stored data read from the nonvolatile storage device is stored in the nonvolatile memory region access memory region and is not stored in the storage data region when an NG occurs in the volatile storage device. The vehicle control device according to claim 1,
The volatile memory storage means is the volatile storage device, and the nonvolatile memory storage means confirms the state of the nonvolatile storage device and stores the stored data when it can be determined that writing is possible. Vehicle control device. The vehicle control device according to claim 1,
The vehicle control device, wherein the volatile storage device and the nonvolatile storage device can store the stored data only in an initial state in which the stored data is not stored. The vehicle control device according to claim 1,
In the state where the storage data is stored in the volatile storage device, the storage data is prohibited from being stored in the nonvolatile storage device unless the nonvolatile storage device stores the storage data. A control apparatus for a vehicle. The vehicle control device according to claim 1,
Based on the detection factor of the stored data, the non-volatile memory storage unit stores all detection factors at a storable timing, and minimizes the cost required for storage by using the logical OR of the data. A control apparatus for a vehicle. The vehicle control device according to claim 1,
The volatile memory storage means is used at the time of detecting each abnormality, stores the latest abnormality detection information in a volatile storage device, and stores the abnormality detection information in the nonvolatile memory at a timing that can be stored by the nonvolatile memory storage means. A vehicular control device that can also be stored in a storage device.

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