JP2000259420A - Device for updating learning value for electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute update processing of learning value by selectively making only an electronic controller storing unusable learning values only a part of an unusable learning value an update object in rewriting a control program. SOLUTION: An ECU compares a control program side check code included in a rewritten control program with a learning value side check code corresponding to a control program used when a learning value is stored and checks the coincidence/noncoincidence between both of them (S120). In the case of noncoincidence, whether or not the initialization of the learning value is needed from the relation of the both check codes (S130), and if needed, the learning value is initialized (S140). The learning value side check code is updated so as to make the learning value side check code coincide with a control program side check code (S150). Consequently, only a usable learning value is selectively initialized and a usable learning value is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a learning value updating device for an electronic control device that updates a learning value of the electronic control device when a control program of the electronic control device is rewritten.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 10-2471 is disclosed.
A memory rewriting device that rewrites a control program of an electronic control device as described in Japanese Patent Publication No. 03-2003 is known.

This memory rewriting device is a device for initializing a learning value stored in a backup memory of the electronic control device when a control program of the electronic control device is rewritten (hereinafter referred to as a learning value updating device). It also has a function or a function as a device for retaining the learning value stored in the backup memory of the electronic control device as it is when the control program of the electronic control device is rewritten.

[0004]

However, the memory rewriting device described in the above-mentioned publication is a learning value updating device that simply initializes a learning value stored in a backup memory of an electronic control unit or simply holds a learning value. Since it only functions as a learning value updating device, there is a drawback that even if there are cases where the learning value is to be initialized and there are cases where the learning value is to be retained due to individual differences in the electronic control device, those cases cannot be distinguished and handled. there were.

More specifically, for example, the first control program is improved to a second control program, and thereafter, the second control program is improved to a third control program. The learning value obtained by the control based on the second control program cannot be used in the control based on the second and third control programs, and the learning value obtained by the control based on the second control program cannot be used in the third control program. Assuming a case in which the control program can be used for control based on a program, when rewriting to the third control program, the electronic control device in which the control program before rewriting is the first control program resets the learning value to the initial value. However, the electronic control device in which the control program before rewriting is the second control program should preferably hold the learning value.

[0006] However, in the learning value updating device described in the above publication, the learning value stored in the backup memory of the electronic control device is either selectively initialized or simply retained. Therefore, an electronic control device storing an unusable learning value is selected to initialize the learning value, and the learning value is held for an electronic control device storing an available learning value. ,
I couldn't do that.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to selectively update only an electronic control device that stores an unusable learning value when a control program is rewritten. Another object of the present invention is to provide a learning value updating device for an electronic control device capable of executing a learning value updating process.

[0008]

Means for Solving the Problems and Effects of the Invention In order to achieve the above-mentioned object, a learning value updating device for an electronic control unit according to the present invention is characterized in that the learning value updating device as the means for solving the problems is as described in claim 1 above. The configuration as described in was adopted.

In the learning value updating device thus configured, the determination means determines whether the learning value stored in the learning value storage means can be used when executing control in accordance with the control program stored in the control program storage means. Is determined based on the check code stored in the learning value side check code storage unit and the check code stored in the control program side check code storage unit.

The specific method of determination is not particularly limited since it can vary depending on the format of the check code and the like. For example, the check code stored in the learning value side check code storage unit and the check code stored in the control program side check code storage unit are stored. When the check codes match, the learning value stored in the learning value storage means is determined to be usable, while when they do not match, it is determined to be unusable. Alternatively, if other information is also included in the check code, a part of the check code may be compared to determine a match or non-match. For example, whether or not several bits of a check code having many bits match. May be determined. Alternatively, a correspondence table covering all combinations of the check codes stored in the learning value side check code storage means and the check codes stored in the control program side check code storage means is stored in the memory, and the correspondence table is stored in the memory. Reference may be made to determine whether it is available or unavailable.

In any case, since the check code of the learning value side check code storage means has only a predetermined limited number, it is determined that the learning value can be used in consideration of the judgment method by the judgment means. It is easy to select a check code that will be determined to be unusable, or a check code that will be determined to be unusable. If such a check code is stored in the control code side check code storage means, The determination means determines whether the learning value can be used or not using the method described above.

When the determining means determines whether the learning value is available or unavailable, the updating means updates the unavailable learning value to an available learning value. On the other hand, learning values that can be used as they are are held as they are. The updating means may update the unusable learning value to a predetermined initial value, or may perform a predetermined data conversion process on the unusable learning value to enable use. May be updated to a proper learning value. The predetermined data conversion process may be an operation based on a predetermined mathematical formula, or may be a data conversion using a predetermined correspondence table.

The updating means updates the check code stored in the learning value side check code storage means to a check code associated with the control program stored in the control program storage means. As a result, thereafter, unless the control program is newly rewritten, the determination means does not determine that the learning value is unavailable.

According to the learning value updating device for the electronic control device as described above, when the control program is rewritten, the case where the learning value can be used and the case where the learning value cannot be used due to the difference in the control program before rewriting. Even if both cases are present, the learning value can be updated only for the electronic control device that stores the unusable learning value without being aware of the update history of the control program on the worker side.

Next, in the learning value updating device according to the present invention, the learning value stored in the learning value storage means is divided into a plurality of groups, and the learning value side check code storage means is provided in the plurality of groups. A plurality of corresponding check codes are stored.
Then, using a plurality of check codes stored in the learning value side check code storage means, the determining means determines whether the learning value included in each group is available for each of the plurality of groups, and updates the group. The means updates the unavailable learning value to a usable learning value for the group including the learning value determined to be unavailable by the determining means.

Therefore, when there are a plurality of learning values, if only some of the learning values are unavailable, the updating process is selectively performed only on the group including the unavailable learning values. It can be carried out. Therefore, when only some of the learning values are unavailable, the updating process is performed more efficiently than when updating is performed for all the learning values, and the time required for the updating process is reduced. You.

Since the learning value updating device of the present invention described above rewrites the storage area of the learning value storage means of the electronic control device, the electronic control device itself is configured to also function as the learning value updating device. It is also possible to configure a learning value updating device different from the electronic control device, connect the two via a data communication path, and temporarily update the learning value storage means of the electronic control device with the learning value updating device. Transfer to the device,
After the necessary update processing is completed, the storage contents of the learning value updating device may be written back to the learning value storage means of the electronic control device.

In configuring the electronic control device itself to function as a learning value updating device, a program or the like necessary for causing the electronic control device to function as a learning value updating device is built in the electronic control device in advance. Alternatively, an external device other than the electronic control device may be connected via a data communication path as necessary, and a program or the like required to function as a learning value updating device may be electronically controlled from the external device. The electronic control device that has transferred the program to the device and received the program or the like may have a function as a learning value updating device.

[0019]

Next, an embodiment of the present invention will be described with reference to an example. First, FIG. 1 shows an engine control device 1 (hereinafter, referred to as ECU1) mounted on an automobile for controlling an internal combustion engine, and connected to the ECU1 when rewriting an engine control program or data contained in the ECU1. 1 is a block diagram illustrating an overall configuration of a memory rewriting system 3 including a memory rewriting device 2 to be used.

As shown in FIG. 1, the ECU 1 receives signals from various sensors 4 for detecting the operating state of the engine and performs waveform processing on the signals. The ECU 1 is based on the sensor signals from the input processing circuit 6. CP that calculates an optimal control amount for the engine and outputs a control signal based on the calculation result
U8 and an output circuit 12 which receives a control signal from the CPU 8 and drives an actuator 10 such as an injector (fuel injection valve) or an igniter attached to the engine.

The CPU 8 has a microprocessor unit 18 (hereinafter, referred to as a microprocessor unit) that operates according to a program.
A non-volatile ROM for storing programs and data necessary for operating the MPU 18
20 and a RAM 22 for storing the operation results and the like of the MPU 18
And a signal from the input processing circuit 6 or the like,
An I / O 24 for outputting a control signal to the output circuit 12 and a communication circuit 25 for performing serial data communication with the memory rewriting device 2 are provided.

Here, the ROM 20 and the RAM of the CPU 8
22 will be described. First, as the ROM 20, a flash E which can electrically erase and write data is used.
An EPROM (commonly called flash ROM or flash memory) is used, and a storage area of the ROM 20 includes a rewritable area 20 a in which data can be rewritten,
It is divided into a non-rewritable area 20b where data cannot be rewritten (or data rewriting is prohibited).

The rewritable area 2 of the ROM 20
0a is used as an area for storing data constituting a control program for engine control and control data. The non-rewritable area 20b is used as an area for storing data constituting a boot program executed immediately after reset. As shown in FIG. 2, the control program includes a check code (hereinafter referred to as a control program-side check code) for determining whether or not a learning value can be used in the control. The rewritable area 20a also functions as a control program side check code storage unit.

A part of the storage area of the RAM 22 is a backup area capable of retaining data even after the power supply is stopped. The backup area has an arithmetic operation when the MPU 18 executes the control program. The learning value data and the like that must be stored even after the power supply is stopped are stored. As shown in FIG. 2, the backup area is divided into a plurality of blocks 22a to 22c (a group in the present invention) in advance, and the learning value data is stored in each block, and a check code ( Hereinafter, the learning value side check code) is also stored. This learning value side check code is the same code as the control program side check code included in the control program used when executing the process of storing the learning value of each block. The backup area also functions as a learning value side check code storage unit.

In the present embodiment, each of the control program-side check code and the learning value-side check code is 2-byte data, and the upper one byte is the version information of the control program, and the lower one byte is the block number of the backup area. It is included.

On the other hand, as shown in FIG. 1, the memory rewriting device 2 performs serial data communication with the CPU 8 on the ECU 1 side to rewrite the control program and control data stored in the rewritable area 20a of the ROM 20 on the ECU 1 side. A CPU 14a to perform the operation, a 12V power supply circuit 14b controlled by the CPU 14a to supply a high voltage (12V in the present embodiment) necessary for rewriting the ROM 20 (rewritable area 20a) to the CPU 8 on the ECU 1 side;
A command switch SW for instructing the CU 1 to rewrite the ROM 20;

The connection between the ECU 1 and the memory rewriting device 2 is performed by connecting the communication line 28, the power supply line 29, and the mode determination signal line 30 to each other via the connection connector 26. . That is, when the connection connector 26 is fitted, serial data communication between the CPU 14a on the memory rewriting device 2 side and the CPU 8 on the ECU 1 becomes possible via the communication line 28, and the power supply line 29 Via the 12V power supply circuit 14b on the memory rewriting device 2 side to the CP on the ECU 1 side.
A voltage (12 V) necessary for rewriting the ROM 20 is supplied to U8. Further, the mode determination signal line 30
Is pulled up to 5 V by a resistor R on the ECU 1 side, and a command switch SW on the memory rewriting device 2 side.
When the command switch SW is turned on when the connection connector 26 is fitted and the command switch SW is turned on, the mode determination signal line 30 is set to the high level on the ECU 1 side. (5V) to the low level (0V). If the mode determination signal line 30 is at the low level, the CPU 8
1 is connected to the memory rewriting device 2, and it is determined that a command to rewrite the ROM 20 has been issued.

In the memory rewriting system 3 configured as described above, as described above, in the ECU 1, the ROM 2
In the rewritable area 20a of 0, a control program and control data for engine control are stored.
The non-rewritable area 20b of the ROM 20 stores a boot program that is not to be rewritten.

When the ignition switch of the vehicle is turned on and the operating voltage (5 V) is supplied from a power supply circuit (not shown) in the ECU 1, the CPU 8 of the ECU 1 starts the operation from the reset state, and The boot program stored in the non-rewritable area 20b is started. When the memory rewriting device 2 is not connected or the command switch SW is not normally turned on, the boot program shifts to the control program stored in the rewritable area 20a of the ROM 20 to control the engine. Is going.

If the CPU 8 determines that the memory rewriting device 2 is connected and the command switch SW is turned on when the boot program is started, the CPU 8 transmits the command from the memory rewriting device 2 (CPU 14a) via the communication line 28. By transferring the read ROM rewriting program to the RAM 22 and starting the ROM rewriting program on the RAM 22, the data stored in the rewritable area 20 a of the ROM 20 is transmitted from the memory rewriting device 2 and thereafter. Rewrite with new incoming data (ie, new control program and control data).

On the other hand, when a predetermined operation is performed by an operator after the memory rewriting device 2 is connected to the ECU 1,
A ROM rewriting program and a new control program for engine control and data constituting control data are sequentially transmitted to the ECU 1.

Next, the processing executed by the CPU 8 when the ECU 1 starts operating from the reset state will be described.
This will be described with reference to FIGS. In the ECU 1, when the power is turned on, the CPU 8 starts the operation from the reset state and executes the processing shown in FIG.

That is, first, the boot program stored in the non-rewritable area 20b of the ROM 20 is started,
It is determined whether the mode is the control program rewriting mode based on whether the mode determination signal line 30 is at the low level (S100). If it is determined that the mode is the control program rewriting mode (S100: YES), a control program rewriting process is executed (S110). This control program rewriting process is a process as shown in FIG. 4 in detail.

When the control program rewriting process is started, C
The PU 8 waits until receiving serial data from the memory rewriting device 2 (S200: NO). When the serial data is received (S200: YES), the received serial data is data constituting the ROM rewriting program, and is stored in an area (work area) behind the backup area of the RAM 22 (S210). And
A jump is made to the address immediately after the backup area of the RAM 22 (S220), and the RAM 2
2 to execute the ROM rewriting program transferred.

When the ROM rewriting program is started, the process first waits until serial data is received from the memory rewriting device 2 (S230: NO). When the serial data is received (S230: YES), the received serial data is data constituting a new control program and control data.
0a is erased, and the received new control program and control data are written in the erased area (S240).

When the process of S240 is completed,
This means that the process of S110 shown in FIG. 3 has been completed, and as a result, all processes have been completed. On the other hand, if it is determined in the process of S100 that the mode is not the control program rewriting mode (S100: NO), it is checked whether or not the check codes on the control program side and the learning value side do not match (S120).

As described above, the control program includes the check code on the control program side. In the control based on the control program, the learning values are stored in the blocks 22a to 22c set in the backup area of the RAM 22. In this case, the control program-side check code is stored in the storage area associated with each of the blocks 22a to 22c and used as the learning value-side check code. The side check codes always match.

On the other hand, after the control program rewriting process of S110 is performed, the check code on the control program side is changed to a new check code.
The control program side check code and the learning value side check code do not match. Therefore, it is possible to determine whether or not the control program rewriting process has been performed by the process of S120.

This check is performed for each block in the backup area. In the example shown in FIG. 2, the blocks 22a and 22b are determined to match, and the block 22c is determined to be mismatch. S120 above
If it is determined that the check codes do not match (that is, the control program rewriting process has been performed) (S120: YES), then the learning value stored in the backup RAM should be initialized or retained. It is checked whether to be performed (S130).

The determination as to whether the learning value should be initialized or held can be made based on the control program side check code and the learning value side check code. In the present embodiment, since the version information of the control program is included in the upper 1 byte of the learning value side check code, the version of the control program used when storing the learning value can be known based on this. If it is determined that the learning value can be used even in the new control program, it can be determined that the learning value should be retained if it can be used, and if the learning value cannot be used, the learning value should be initialized. Good. In the example shown in FIG. 2 as well, as for the block 22c, since the upper one byte of the check code on the control program side does not match the upper byte of the learning value side check code, it may be adopted as a determination method to determine that the block 22c should be initialized immediately.
Alternatively, even if the upper one byte of the control program side check code and the learning value side check code do not match, for example, the upper one byte of the control program side check code
In the case where the combination of the byte is "AA" and the upper byte of the learning value side check code is "55", it may be adopted as a judgment method to judge that the initialization is unnecessary.

If it is determined in step S130 that the learning value should be initialized, the corresponding block in the backup RAM is initialized based on the block number included in the lower 1 byte of the check code ( S
140). As the initial value, a value which is determined in advance for each learning value item and included in the control program is used.

Then, whether the process of S140 is completed,
Alternatively, if it is determined in the process of S130 that the learning value should be held, the upper one byte of the learning value side check code is replaced with the upper one byte of the control program side check code.
Update to match the byte (S150). Thereby, even if the process of S120 is executed again thereafter,
No check code mismatch is detected.

In this embodiment, the above S12
By executing the processing of 0 to S150, the ECU 1 itself functions as the learning value updating device according to the present invention.
When the process of S150 is completed in this way, or when it is determined in the process of S120 that the check codes match (that is, the control program rewriting process has not been performed) (S120: NO), the RAM is determined.
Then, an area other than the backup area 22a is cleared and initialization is performed (S160). Thereafter, the process jumps to the engine control program, and the engine control processing is performed based on the control program stored in the rewritable area 20a of the ROM 20. It is executed (S170).

The engine control process in S170 determines the optimum fuel injection amount and ignition timing for the engine based on various sensor signals from the input processing circuit 6 and control data stored in the rewritable area 20a of the ROM 20. The calculation is performed, and a control signal for driving the actuator 10 such as an injector or an igniter is output in accordance with the calculation result. Then, by executing such an engine control process, the engine can be operated.

As described above, the ECU of the present embodiment
According to No. 1, when the learning values stored in the backup area of the RAM 22 are available when the processes of S120 to S150 are executed to function as the learning value updating device, the available learning values are retained as they are. While R
If the learning value stored in the backup area of the AM 22 becomes unusable, the unusable learning value is initialized, so that the electronic control unit can be used without the operator having to be aware of the update history of the control program. Only when the unusable learning value is stored, the unusable learning value can be updated.

Further, since the backup area of the RAM 22 is divided into a plurality of blocks and it is determined whether or not the learning value is usable for each block, only the learning value of the block that needs to be updated is processed. The update process can be completed more quickly than in the case where all the learning values are updated.

Although the embodiments of the present invention have been described above, various specific embodiments other than those described above are conceivable for the embodiments of the present invention. For example, in the above-described embodiment, the learning value is initialized by using an initial value that is predetermined for each item of the learning value and included in the control program, but the predetermined data conversion into an unusable learning value is performed. If the process can be performed to obtain a usable learning value, a value obtained by the data conversion process may be stored as a new learning value instead of a predetermined initial value. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a memory rewriting system of an electronic control device.

FIG. 2 is an explanatory diagram illustrating storage areas of a ROM and a RAM.

FIG. 3 is a flowchart illustrating a process executed on an engine control device (ECU) side.

FIG. 4 is a flowchart illustrating a control program rewriting process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine control device (ECU), 2 ... Memory rewriting device, 3 ... Memory rewriting system, 4 ... Sensor, 6 ... Input processing circuit, 8 ... CPU, 10 ...
-Actuator, 12-Output circuit, 18-Microprocessor unit (MPU), 20-
ROM, 20a ... rewritable area, 20b ...
Non-rewritable area, 22 ... RAM, 22a to 22c
... Block, 25 ... Communication circuit, 26 ... Connector, 28 ... Communication line, 29 ... Power supply line, 30 ... Mode determination signal line.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Tamada 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 5B076 BB14 EB01

Claims (4)

[Claims] 1. A control program storage means for storing a control program which is rewritten as required, and a learning value storage means for storing a learning value, wherein control for a control object is performed according to the control program stored in the control program storage means. And stores the variable data obtained at that time as a learning value in the learning value storage means, and rewrites the control program for an electronic control device that executes the control while using the learning value. Is done,
In the learning value updating device for an electronic control device that executes the updating of the learning value, a check code associated with a control program used when executing a process of storing a learning value in the learning value storage unit is stored. Learning value side check code storage means, control program side check code storage means for storing a check code associated with a control program stored in the control program storage means, and learning value side check code storage means. Based on the check code and the check code stored in the control program-side check code storage means, when the electronic control device executes the control according to the control program stored in the control program storage means, the learning value storage means Judging means for judging whether or not the learning value to be stored can be used When the learning value is determined to be unusable by the determination unit, the unusable learning value is updated to a usable learning value, and a check code stored in the learning value side check code storage unit is updated. Updating means for updating a check code associated with a control program stored in the control program storage means. 2. The learning value stored in the learning value storage means is divided into a plurality of groups, and the learning value side check code storage means stores a plurality of check codes corresponding to the plurality of groups. The determination means uses a plurality of check codes stored in the learning value side check code storage means, for each of the plurality of groups, determines whether a learning value included in each group is available, The updating means updates the unavailable learning value to an available learning value for a group including a learning value determined to be unavailable by the determining means, and stores the learning value-side check code corresponding to the group. The control code stored in the control means is updated to a check code associated with a control program stored in the control program storage means. Learning value updating device for electronic control unit according. 3. The learning value update for an electronic control device according to claim 1, wherein said updating means updates said unavailable learning value to a predetermined initial value. apparatus. 4. The updating means performs a predetermined data conversion process on the unavailable learning value,
The learning value updating device for an electronic control device according to claim 1, wherein the learning value is updated to the available learning value.