JPH08177608A - Control system for vehicle - Google Patents

Abstract

PURPOSE: To read out a program or a datum which is low in the frequency of use among the stored contents of a serial communication system nonvolatile memory means when a special condition is satisfied, and to transfer it to a work memory means. CONSTITUTION: The memory area of a serial communication system EEPROM 5 arranged in ECU 6 for executing the engine control of an automobile is separately composed of the first area where a failure diagnosis program and judged value data are stored, in which the failure diagnosis program is usually executed after the start of an engine and the second area where a data outputting program is stored, which is used only in the case of an external diagnosis device 9 connected to ECU 6. CPU 1 first transfers the stored contents of the first area to RAM 3, and the stored contents of the second area are read out when the external diagnosis device 9 is connected to ECU 6 and transfered to RAM 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a program is read from a storage means at the time of execution of the program, transfers the program to a work storage means capable of high-speed access, and the subsequent programs from the work storage means. The present invention relates to a vehicle control device for reading and executing.

[0002]

2. Description of the Related Art In a vehicle such as an automobile, its engine is controlled by a control unit including a microcomputer, and an engine control program is stored in a storage means such as a ROM.

Further, some automobiles have an EEPROM which is used as an auxiliary storage means inside the control device. In order to reduce the number of wirings, this EEPROM is often of serial communication type in which addresses and data are synchronized with a clock signal and transmitted and received bit by bit.

[0004]

By the way, in this way,
When the serial communication type EEPROM is used for automobiles, it is assumed that, for example, a failure diagnosis program for the engine and determination data used for the failure diagnosis are stored. In this case, after the control program is read at the time of starting the engine due to the problem of the read time of the EEPROM, the failure diagnosis program and the judgment data are serially read from the EEPROM and transferred to the RAM having a high access speed. And the CP of the microcomputer
The U reads the failure diagnosis program transferred to the RAM and diagnoses each part of the vehicle. As a result, when a failure occurs, the driver is notified by, for example, being displayed on the driver's seat panel.

Further, in the failure diagnosis of an automobile, there is a case where more detailed data of a failure diagnosis result performed by the control device is displayed on the external diagnosis device by connecting the external diagnosis device to the control device. is there. Therefore, EEP
It is also assumed that the ROM also stores a data output program for outputting failure diagnostic data when an external diagnostic device is connected. These programs are also read from the EEPROM together with the failure diagnostic program when the engine is started. It will be transferred to RAM.

However, the serial communication EEP
The ROM transfers the address and the data bit by bit in synchronization with the clock as described above, and it takes a very long time to read the data. Further, the opportunity for the external diagnostic device to be connected to the control device is rare at the time of periodic inspections, and therefore it is necessary to read the data output program and data for that purpose from the EEPROM and transfer it to the RAM each time. It is an extra processing load for the controller,
There was a problem that the processing time was long.

The present invention is intended to solve the above-mentioned problems, and an object thereof is to store the contents stored in a non-volatile storage means which is an auxiliary storage means, and to transfer an infrequently used auxiliary program or data to the working storage means. It is an object of the present invention to provide a vehicle control device that performs control so that it is performed only when requirements are met.

[0008]

In order to achieve the above object, a vehicle control apparatus according to a first aspect of the present invention comprises a control program storage means for storing a control program and a work program to which a program or data is transferred during work. Storage means,
Non-volatile storage means of serial communication system for storing auxiliary programs or data other than the control program, and executing the control program read from the control program storage means, and working the auxiliary program or data read from the non-volatile storage means In the nonvolatile storage means, the auxiliary program or data that is frequently used is stored in the nonvolatile storage means after being transferred to the storage means, and thereafter, when necessary, the auxiliary program or data is read from the work storage means and executed. The first area to be stored and the second area to which an auxiliary program or data having a low frequency of use are stored separately, and the control means transfers the storage content of the first area to the working storage means first. However, when the special requirement is met, the stored contents of the second area are transferred to the working storage means. It is characterized in that.

According to another aspect of the present invention, there is provided a vehicle control device, wherein the control means selects suspension, interruption, or execution of the storage content of the storage content of the second area according to the content of the processing command in the special requirement. It is characterized in that it is configured as described above.

In this case, the auxiliary program or data stored in the non-volatile storage means may be a program or data relating to vehicle failure diagnosis (claim 3).

[0011]

According to the vehicle control device of the present invention, the control means transfers the stored contents of the first area, which is used more frequently than the non-volatile storage means, to the working storage means first and the used frequency is low. The stored contents of the second area are read out and transferred to the working storage means when the special requirement is satisfied, so that unnecessary reading and transfer processing is not performed.

According to the vehicle control device of the second aspect,
Even if the special requirement is satisfied, the transfer of the storage content of the second area to the working storage means is stopped or interrupted, or the second area is transferred according to the content of the processing command in the special requirement. Execute the stored contents of.

In this case, if the auxiliary program or data stored in the non-volatile storage means is a program or data relating to vehicle failure diagnosis, the stored contents of the second area, which is used infrequently, is externally used for failure diagnosis. Is read only when necessary for the processing of (1) and transferred to the working storage means (claim 3).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a failure diagnosis process in engine control of an automobile, which is a vehicle, will be described below with reference to the drawings. In FIG. 1 showing an electrical configuration of a portion according to the present invention, a CPU 1 which is a control means
Are connected to the ROM 2 as the control program storage means and the RAM 3 as the work storage means via parallel address and data bus lines and control signal lines. The above constitutes a microcomputer (hereinafter referred to as a microcomputer) 4.

Further, outside the microcomputer 4, there is a serial communication type EEPROM 5 which is a non-volatile storage means, and the EEPROM 5 is connected to the CPU 1 via a serial interface (not shown) by a serial bus. The microcomputer 4 and the EEPROM 5 constitute an engine control ECU (hereinafter simply referred to as ECU) 6 that controls an engine (not shown) as a vehicle control device.

A sensor 7 including a water temperature sensor, an intake air temperature sensor, a throttle sensor, etc. is connected to the CPU 1 via an A / D converter (not shown), such as an injector or an idle speed control (ISC) valve. The actuator 8 is connected via an output circuit (not shown). Furthermore, for example, an external diagnostic device 9 can be connected to the ECU 6 (CPU 1) by a serial bus via a serial interface (not shown), and the CPU 1 determines whether or not special requirements are met, that is, the external condition. Whether or not the diagnostic device 9 is connected can be detected by a detection signal output from a connection detection switch (not shown).

In FIG. 2 showing the address map of the EEPROM 5, the first half from the beginning of the address area is the first area. For example, the open / short judgment value of the water temperature sensor and the open / short judgment value of the intake air temperature sensor as auxiliary data. And determination value data such as an ISC valve abnormality determination value are stored. Further, although not shown in the drawings, a diagnostic program such as a water temperature sensor, an intake air temperature sensor, an ISC valve, etc. as an auxiliary program for performing a failure diagnosis using these judgment value data is also stored. The diagnostic programs and the judgment value data stored in these first areas are frequently used each time the engine is operated.

The area after the first area is the second area, and is an auxiliary program used for outputting failure diagnostic data to the external diagnostic device 9, for example, a water temperature sensor, an intake air temperature sensor, an ISC valve diagnostic data output program, etc. Is stored. The output program stored in these second areas is used only when the external diagnostic device 9 is connected to the ECU 6, and its frequency of use is low.

Next, the operation of this embodiment will be described with reference to FIGS. In FIG. 3 showing a flowchart of the control contents in the initialization processing after the reset is released, first, the processing step P of the “RAM initialization” is performed.
At 1, the CPU 1 clears the stored contents of the area used as the work area of the RAM 3 to 0. By this 0 clearing, all the flags which are set and used by the CPU 1 by software in the process described later are also reset. Then, the process proceeds to the next "EEPROM read address (N) initial setting" processing step P2, where CP
The head address N of the area assigned to the EEPROM 5 on the address map of U1 is initialized in the address counter.

Then, the process proceeds to the "EEPROM read request flag set" processing step P3, in which "1" is written in the EEPROM read request flag area provided in the RAM 3 to set the request flag. The process moves to the processing step P4 of "release of interrupt prohibition", the interrupt prohibition state automatically set in the status register of the CPU 1 at power-on is released, and the process proceeds to the next step not shown.

After that, the CPU 1 reads the control program from the ROM 2 and controls the start and rotation of the engine in a main routine (not shown). Further, the CPU 1 is configured so that a timer interrupt is input every 8 ms by a timer (not shown). 4 to 6 are flowcharts of control contents in the timer interrupt processing.

External diagnostic device 9 for timer interrupt processing
4 showing a flowchart of the control contents associated with the connection state of
Then, first, the judgment step Q of "connecting external diagnostic device?"
At 1, the CPU 1 refers to a detection signal from a connection detection switch (not shown) and determines whether or not the external diagnostic device 9 is connected to the ECU 6. If the external diagnostic device 9 is not connected and it is determined to be "NO" in the determination step Q1, the process proceeds to the process shown in FIG. Further, the external diagnostic device 9 is connected, and the judgment step Q
If it is determined to be "YES" in step 1, the process proceeds to the next process step Q2 of "transmit a processing command transmission request signal" and the processing command transmission request signal is transmitted to the external diagnostic device 9. Move to the processing shown.

EEPROM 5 in timer interrupt processing
5, which shows a flowchart of an execution partial process (hereinafter, simply referred to as an execution partial process) of the program stored in FIG. 5, firstly, in the determination step R1 of "first area read completion flag = 1?" It is determined whether or not the first area read completion flag, which indicates that the area has been read, is "1". In the initial state, all the flags are cleared to 0 in step P1, so it is determined to be "NO", and the process proceeds to the process shown in FIG. 6 described next.

EEPROM 5 in timer interrupt processing
6, which shows a flowchart of the read control partial process (hereinafter, simply referred to as the control partial process) of FIG.
EPROM read request flag = 1? Processing step S
At 1, it is determined whether the EEPROM read request flag is set to "1". Here, since it is set to "1" in step P3, "YE
S ", the process proceeds to the next" read from address (N) "processing step S2, and is initialized at step P2, and the stored content of the top address of the EEPROM 5 indicated by the count value N of the address counter is shown. (Water temperature sensor open / short judgment value) is read out via the serial bus. Then, the processing step S of “transfer to RAM”
Move to 3.

In processing step S3, step S
The stored contents of the EEPROM 5 read in 2 are transferred to the area of the RAM 3 allocated as the work area. Then, the process proceeds to the next step S4 of "Reading of first area completed?", And the value set as the final address of the first area of the EEPROM 5 is compared with the counter value N. At this point in time, if it is determined to be "NO" in the determination step S4, the process proceeds to "N = N + 1" processing step S5 and the count value N of the address counter is incremented. Return to.

The processes shown in FIGS. 4 to 6 up to this point are as follows.
By repeating the timer interrupt every 8ms,
The content stored in the first area of the EEPROM 5 is 1 from the beginning.
The addresses are read out and transferred to the RAM 3. When the count value N of the address counter is incremented in step S5 and becomes equal to the value set as the final address of the first area, "YES" is determined in step S4 and the next "first area" is determined. Then, the process proceeds to the processing step S6 of "reading completion flag set".

In the processing step S6, the first area reading completion flag indicating the completion of reading the first area is set to "1", and the process proceeds to the judgment step S7 of "Reading completion of the second area?" The count value N of the address counter is compared with the value set as the final address of the second area. At this point, it is determined to be "NO" in the determination step S7, and the process proceeds to the processing step S5 to increment the count value N of the address counter (at this point, the count value N becomes equal to the start address of the second area). ), Exits the timer interrupt process and returns to the main routine (not shown).

Next, when the timer interrupt is input, the reading completion flag of the first area is set to "1", so that "YES" is determined in step R1 of FIG. Then, when the process moves to the determination step R2 of "connect external diagnostic device?", It is determined whether the external diagnostic device 9 is connected to the ECU 6 (whether special requirements are met). Here, if the external diagnostic device 9 is connected, it is determined to be "YES" in the determination step R2, and the process proceeds to the determination step R3 of "Reception of processing command from external diagnostic device?" It is determined whether the processing command is received from 9.

In the judgment step R3, when the processing command is not received from the external diagnostic device 9 and the judgment is "NO", the execution partial processing shown in FIG. 5 is skipped and the control partial processing shown in FIG. 6 is performed. In the judgment step R3, the processing command is received from the external diagnostic device 9 and "YE
If it is determined to be "S", then the process proceeds to the next "Processing command is 1?" Determination step R4 to determine whether the content of the processing command from the external diagnostic device 9 is "1"("0"). In this case, the content “1” of the processing command indicates that the stored content of the second area needs to be executed, and conversely, the content “0” indicates that the execution is unnecessary. If "YES" is determined in the determination step R4, the process proceeds to the next "second area read completion flag = 1?" Determination step R5, and the second area read completion indicating the completion of the second area read of the EEPROM 5 is completed. It is determined whether the flag is set to "1". At this point, the second area of the EEPROM 5 has not been read yet, so "NO" is determined in the determination step R5, the execution partial process shown in FIG. 5 is skipped, and the control partial process shown in FIG. 6 is performed. .

Then, in step S2 of FIG.
At this point, the stored content of the start address of the second area of the EEPROM 5 indicated by the count value N of the address counter (the start portion of the water temperature sensor diagnostic data output program)
Is read. Then, as in the case of the first area, the stored contents are transferred to the RAM 3 in the next step S3.

In the next step S4, the reading of the first area is completed, so "YES" is determined and the flag setting operation in step S6 is repeated. In the next step S7, it is determined to be "NO" at this point, so if the count value N is incremented in step S5, the timer interrupt process is skipped and the process proceeds to a main routine (not shown).

Since the processing up to this point is repeated every 8 ms when the timer interrupt is entered, the stored contents of the second area of the EEPROM 5 are read out one address at a time from the beginning, as in the case of the first area described above. Are transferred to RAM3. Then, when the count value N is incremented in step S5 and becomes equal to the value set as the final address of the second area, it is determined as "YES" in step S7 and the next "second area read completion flag" is determined. Then, the processing proceeds to processing step S8 of "set".

In the processing step S8, when the second area read completion flag indicating the completion of reading the second area is set to "1", the process proceeds to the next "EEPROM read request flag reset" processing step S9. And the EEPROM set to "1" in step P3
When the read request flag is reset to "0" and reset, the timer interrupt process is exited and the process returns to the main routine.
In the processing at the time of timer interruption after this point, step S1
Since it is determined to be "NO" in step 1, the control partial processing shown in FIG. 6 thereafter is not performed and the processing returns from the interrupt processing routine.

Then, in the next timer interrupt processing, the second
Since the reading completion flag of the area is set, if "YES" is determined in step R4 of FIG. 5 and the process proceeds to step R5, "YES" is determined here,
Then, the process proceeds to the process step R6 of "execute process of first and second areas".

In the processing step R6, the failure diagnosis program and the judgment value data of the first area of the EEPROM 5 which are transferred to the RAM 3 are read out, and the sensors 7 such as the water temperature sensor and the intake air temperature sensor and the actuator 8 such as the ISC valve are read. On the other hand, the diagnostic program is executed.
Then, the diagnostic data as the execution result is written and stored in the RAM 3, and when there is an abnormality in the diagnosed portion, the display lamp of the panel is turned on to inform the driver of the abnormality. I do.

After the failure diagnosis by the diagnostic program is completed, the second data of the EEPROM 5 transferred to the RAM 3 is next.
The diagnostic data output program of the area is read, and the diagnostic data stored in the RAM 3 is read according to the output program and output to the external diagnostic device 9 via the serial bus. Then, the execution partial process of FIG. 5 is ended. Then, when the diagnostic data is given from the ECU 6, the external diagnostic device 9 displays the diagnostic data on a display unit (not shown) or the like.

After the first area read completion flag is set, the external diagnostic device 9 is not connected at the time of shifting to step R2, and "N" is set at step R2.
If it is determined to be “O”, it is not necessary to transmit the diagnostic data to the external diagnostic device 9, it is determined that there is no request to read the output program stored in the second area of the EEPROM 5, and the next “EEPROM read” is performed. The process proceeds to the process step R7 of "reset request flag", where EEPRO is set.
The M read request flag is reset to "0". Therefore, after that, the read control process of FIG.
Since it is judged as “NO” at this point, the processing is immediately exited.
The second area of PROM 5 is not read. Then, the processing step R8 of the next "execution of processing in the first area"
When the execution of the diagnostic program of the first area of the EEPROM 5 is performed in the same manner as in step R6, the execution partial processing of FIG. 5 is ended.

Further, if the processing command from the external diagnostic device 9 is not received at the time of shifting to step R3 after the first area reading completion flag is set, it is judged as "NO" at step R3. Then, even if the transfer of the storage contents of the second area to the RAM 3 is completed, the process does not proceed to step R4. Of course, if a processing command is received from the external diagnostic device 9 after that, in step R3, "YE
S "is determined and the process proceeds to step R4. When it is determined "YES" in step R4, step R5
And R6.

However, if "NO" is determined in the step R4, it is judged that the execution is unnecessary even if the transfer of the storage contents of the second area to the RAM 3 is completed, and the process proceeds to the step R7. become.

As described above, according to the present embodiment, the EEPR arranged inside the ECU 6 for controlling the engine of the automobile.
When the external diagnosis device 9 is connected to the ECU 6 and the first area in which the storage area of the OM 5 stores a failure diagnosis program that is normally executed after engine startup and judgment value data used for the program, And a second area in which a diagnostic data output program for transmitting diagnostic data to the diagnostic device 9 is stored.
The CPU 1 transfers the stored contents of the first area to the RAM 3 first, and the stored contents of the second area to the RAM 3 when the external diagnostic device 9 is connected,
When not connected, the transfer to the RAM 3 is not performed (stopped).

Therefore, unlike the prior art, the external diagnostic device 9
Is not connected, unnecessary reading processing of the second area of the EEPROM 5 is not performed, and the load of the reading processing of the CPU 1 can be reduced, so that the processing time can be shortened and reduced. It is also possible to allocate the burden to the other effective processing.

When the external diagnostic device 9 is connected to the CPU 1 and no processing command is transmitted from the external diagnostic device 9, the transfer of the storage contents of the first area to the RAM 3 is completed. Then, the transfer of the storage content of the second area to the RAM 3 is subsequently started, but it is not executed even if the transfer of the storage content of the second area is completed. When the CPU 1 receives the processing command from the external diagnostic device 9 and the content of the processing command needs to be executed, the RAM 3 is executed.
The stored contents of the first area and the second area, which have been transferred to, are executed.

Therefore, the storage contents of the first area and the second area transferred to the RAM 3 can be executed at a desired time. Moreover, the memory contents of the second area are RAM
Even during the transfer to 3, the transfer can be interrupted by making it unnecessary to execute the contents of the processing command of the external diagnostic device 9.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications are possible. Although the data or program stored in the EEPROM 5 is related to the failure diagnosis, the data or program is not limited to this and may be a vehicle anti-theft device as long as it is related to the vehicle, and whether the secret code stored in the key is authentic. EE used for the code collation unit that collates
In the PROM, the first PIN code that is collated with the PIN code normally stored in the frequently used key is EEPR.
The second secret code stored in the first area of the OM and used when inspecting the operation of the code collating unit itself and collated with the specific secret code input from the external device is stored in the second area. There are also examples. The point is that the frequently used ones are stored in the EEPROM as the first area,
In addition, it is sufficient to store the less frequently used area as the second area, and control so as not to perform the reading when it is determined that there is no read request (special requirement is not satisfied) for the second area.

Although the timer interrupt period is 8 ms, the period may be longer or shorter than this. In addition, FIG.
It is also possible to perform high-speed processing only by executing the read control processing of the EEPROM 5 shown in (1) by executing it with an interrupt having a short cycle of 2 ms, for example. Furthermore, FIG.
The read control processing of the EEPROM 5 shown in FIG. 2 may be configured to read a plurality of addresses and transfer to the RAM 3 by loop processing at the time of one interrupt processing.

4 and 5 as a series of timer interrupt processing
6 and FIG. 6 are configured as one program module, the processing order of each module in the timer interrupt processing is as shown in FIGS.
The order is not limited to that shown in FIG. 6 and can be changed arbitrarily. The second embodiment can be modified in the same manner as in FIGS. 9, 10, and 6. Further, the object is not limited to an automobile, and can be appropriately applied to vehicles in general.

[0047]

Since the present invention is as described above,
The following effects are obtained. According to another aspect of the vehicle control device of the present invention, the control means transfers the stored contents of the first area, which is used more frequently than the non-volatile storage means, to the work storage means first, and the second area which is used less frequently. For the memory content of
When the special requirement is satisfied, the data is read and transferred to the work storage means, so that unnecessary reading and transfer processing is not performed, and the processing load can be reduced.

According to the vehicle control device of the second aspect,
Depending on the content of the processing command in the special requirement, the transfer of the storage content of the second area from the non-volatile storage means to the work storage means is stopped, interrupted, or the transferred storage content of the second area is executed. Things can be done selectively.

In this case, if the auxiliary program or data stored in the non-volatile storage means is a program or data relating to vehicle failure diagnosis, the content stored in the second area that is used at low frequency is externally used for failure diagnosis. Is read only when necessary for the processing of (1) and transferred to the working storage means (claim 3).

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 EEPROM address map

FIG. 3 is a flowchart showing control contents of initialization processing.

FIG. 4 is a flowchart according to a connection state of an external diagnostic device in timer interrupt processing.

FIG. 5 is a flowchart showing an execution part of a program stored in an EEPROM in timer interrupt processing.

FIG. 6 is a flowchart showing an EEPROM read control portion in timer interrupt processing.

[Explanation of symbols]

1 is a CPU (control means), 2 and 10 are ROM (control program storage means), 3 is a RAM (working storage means),
Reference numerals 5 and 11 represent an EEPROM (nonvolatile storage means), 6 and 12 represent an engine control ECU (vehicle control device), and 9 represents an external diagnostic device.

Claims (3)

[Claims] 1. A control program storage means for storing a control program, a working storage means for transferring a program or data at the time of work, and a serial communication non-volatile for storing an auxiliary program or data other than the control program. The storage means executes the control program read from the control program storage means, transfers the auxiliary program or data read from the non-volatile storage means to the work storage means, and thereafter, the work storage means as necessary. In a vehicle control device comprising: a control unit that reads and executes an auxiliary program or data from the storage device, the nonvolatile storage unit includes a first area in which an auxiliary program or data that is frequently used is stored, and a low frequency of use. Second, where auxiliary programs or data are stored
The area is sorted into an area and stored, and the control means is
Transfer the storage contents of the area to the working storage means first,
A vehicle control device characterized in that the stored contents of the second area are transferred to a working storage means when special requirements are met. 2. The control means is configured to select suspension, interruption, or execution of the storage content of the storage content of the second area in accordance with the content of the processing command in the special requirement. The vehicle control device according to claim 1. 3. The auxiliary program or data stored in the non-volatile storage means is a program or data relating to vehicle failure diagnosis.
Alternatively, the vehicle control device according to item 2.