JP2000267942A - Electronic controller and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic controller capable of quickly obtaining sum data as necessary and a recording medium. SOLUTION: In a step 200, the program code of the n-th block is integrated. In a step 210, the integrated result is stored in the n-th area of a RAM which corresponds to the block number. In a step 220, whether the integration of all blocks has ended or not is judged. In a step 240, all sum data summed in each block and stored in the RAM are integrated to calculate the whole sum data. In a step 250, the whole sum data are stored in a stand-by RAM. In a step 260, whether the whole sum data coincide with a value stored in an EE- ROM or not is judged. In a step 270, the whole sum data are stored in the EE-ROM as a new value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control unit and a recording medium capable of outputting sum data to an external device, for example, to check an abnormality of an engine control program by checking the sum data.

[0002]

2. Description of the Related Art Conventionally, for controlling an engine of an automobile, for example, an electronic control unit mainly including a microcomputer has been used. In this electronic control device, for example, in order to check whether there is an abnormality in a program for controlling the engine, for example, a 2-byte program code (machine language) is integrated to create sum data, and the value of the sum data is a predetermined value. Check that the value is set (sum check).

The following two methods are conceivable as a method for creating the sum data. Under special conditions that are not normally possible (for example, when there is a request from an external tool), the program code is integrated all at once from the beginning to the end of the program to create sum data.

When the load is light (engine speed = 0)
Only when there is a request for sum data from an external tool, the program is divided into a plurality of blocks, the program code is integrated for each block at a predetermined cycle, and the integrated values are summed to create sum data I do.

[0005]

However, the above-mentioned technology has the following problems. For example, if the program size is 128 Kbytes and the program code is integrated by two bytes, and one integration requires a processing time of 1 μs, (128 Kbytes / 2 bytes) × 1 μs = 6
A processing time of 4 ms is required.

[0006] Normally, the engine control program is designed so that the circulating speed of the main routine is not more than a predetermined value (even when the interrupt load is high). Therefore, for example, when the predetermined value is 20 ms, if the integration is performed at once from the beginning to the end of the program by the above-described technique, the integration process takes 64 ms, and the circulating speed of the main routine increases to 64 ms + 20 ms = 84 ms. Resulting in.

[0007] As described above, if the control is normally performed within 20 ms or less, and if the control is performed at several times the cycle, rapid vehicle control may be hindered, which is not preferable in terms of vehicle control. When a request is received from an external tool, the external tool waits from the request until the end of the integration.

[0008] Further, the CPU operates at the rotation speed of the main routine.
In the system that detects the abnormal operation, when the circulating speed of the main routine is increased, it may cause erroneous detection of the CPU abnormality. On the other hand, as in the above-described technique, when the sum data is externally requested and the integration is performed at a predetermined cycle for each of the blocks divided into a plurality of blocks, 1
Executes the integration of the program code of two blocks.

Therefore, for example, 1 is added to the integration of one block.
In this case, (64 ms / 1 ms) × 20 ms = from the request of the sum data to the end of the integration.
It takes a lot of time of 1280 ms. However, in the communication with the external tool, normally, if there is no response for a predetermined time, the external tool performs a timeout process (a process of terminating the communication as a timeout), and the communication is not established depending on the timeout time. Would. In other words, if the calculation takes a long time, sum data may not be obtained.

When there is a request from an external tool, the external tool waits until the integration is completed after the request, similarly to the above-mentioned technique.
Further, conventionally, since the integration process is performed only when the engine load is light (engine speed = 0), there is also a problem that sum data cannot be obtained when the engine speed is not 0.

Ii) In addition to the above-mentioned problems, new vehicles after 2000 are provided as a measure to prevent unauthorized modification of the on-vehicle ECU program according to the European Union's automobile failure diagnosis system (E-OBD) regulations. On the other hand, a calibration verification number (CVN) is determined to be output as vehicle information in response to a request from a failure diagnosis apparatus for an automobile, and the above-mentioned sum data is used as the CVN. Consideration is also needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an electronic control device and a recording medium which can quickly obtain sum data as needed. .

[0013]

Means for Solving the Problems and Effects of the Invention (1) The invention of claim 1 divides a program into a plurality of blocks,
Normally, block-by-block sum data generating means for sequentially generating block-by-block sum data of each block at predetermined intervals,
The block-by-block sum data storage unit that stores the block-by-block sum data created by the block-by-block sum data creation unit in each storage area, and all the block-by-block sum data are stored in the block-by-block sum data storage unit. In this case, all the sum data for each block are integrated, and all the sum data calculating means for obtaining all the sum data, and all the sum data storage means for storing the all sum data calculated by the all sum data calculating means, And an all-sum data output means for outputting all the sum data stored by the all-sum data storage means when there is a request for external sum data. And

The present invention is an electronic control unit that outputs program sum data in response to an external request for sum data. In the present invention, the program is divided into a plurality of blocks, and at regular intervals (for example, once every main routine), the block-by-block sum data of each block is sequentially created, and the value is stored in, for example, a RAM or a standby. Each is stored in a predetermined storage area such as a RAM. Furthermore,
When all the block-by-block sum data are stored, all the block-by-block sum data are integrated to obtain all the sum data, and the value is stored in, for example, a standby RAM or the like. Then, when there is a request for the sum data from the outside, all the sum data is output to the outside.

That is, in the present invention, the processing for calculating the sum data for each block which is finely divided is always performed, so that the processing time for each block is short, and
The circulation speed of the main routine does not become extremely long. Therefore, other controls are hardly affected.

Further, since all the sum data is held, when there is an external request for the sum data, the entire sum data can be output to the outside quickly. Furthermore,
Since there is no need to wait for a long time until a response is received after an external request for sum data, even in a system that determines a CPU abnormality based on the rotation speed of the main routine, C
There is no erroneous determination of PU abnormality. In addition, even when a timeout process is performed on the tool side, a quick response is possible, so that there is an advantage that communication is reliably established.

In addition, when there is a request for sum data from the outside, all the sum data can be output, so that unauthorized modification of the program can be checked based on the whole sum data. (2) The invention according to claim 2, wherein the program is divided into a plurality of blocks, and the block-by-block sum data creating means for sequentially creating the block-by-block sum data of each block at regular intervals, and the block-by-block sum data. The block-by-block sum data storage unit that stores the block-by-block sum data created by the creation unit in each storage area, and the block-by-block sum data storage unit when there is an external request for the sum data. Total sum data calculating means for integrating the obtained sum data for each block to obtain total sum data; and total sum data output means for outputting the total sum data calculated by the total sum data calculating means. The gist is an electronic control device characterized by the above.

The present invention is an electronic control device capable of outputting program sum data in response to an external request for sum data. In the present invention, the program is divided into a plurality of blocks, and at regular intervals (for example, once every main routine), block-by-block sum data of each block is sequentially created, and the value is stored in, for example, RA.
M or a predetermined storage area such as a standby RAM. When there is a request for sum data from outside, the stored sum data for each block is integrated to obtain and output all the sum data.

That is, in the present invention, the processing for calculating the sum data for each block is always performed, as in the first aspect, so that the processing time is short, and therefore, other controls are hardly affected. . Further, the total sum data is calculated when there is a request for the sum data from the outside, but it does not take much time to calculate the total sum data, so that the total sum data can be output to the outside quickly.

Further, similarly to the first aspect, there is no need to wait a long time before the response after the external request for the sum data, so that the C speed can be maintained at the revolving speed of the main routine.
Even a system that determines a PU abnormality does not erroneously determine a CPU abnormality. Also, when the tool performs the timeout process, the communication is reliably established. In addition, since all the sum data can be output in response to an external request, it is possible to check for unauthorized modification of the program based on the entire sum data.

(3) According to a third aspect of the present invention, the program is divided into a plurality of blocks, and the block-by-block sum data creating means for sequentially creating the block-by-block sum data of each block at regular intervals, and A sequentially integrating means for sequentially integrating the sum data for each block created by the separate sum data creating means; an integrated value storing means for storing the integrated value integrated by the sequential integrating means; When the summation of the block-by-block sum data is completed, the total sum data storage means for storing the integrated value as total sum data, and the sum data storage means when an external sum data request is received. An electronic control unit comprising: a total sum data output unit that outputs the stored total sum data.

The present invention is an electronic control unit that outputs program sum data in response to an external request for sum data. In the present invention, the program is divided into a plurality of blocks, and at every predetermined period (for example, once every main routine), sum data for each block is created and the values are sequentially integrated. Further, when the summation of all block-by-block sum data is completed, the sum value (that is, all sum data) is stored. Then, when there is a request for sum data from the outside, all the stored sum data is output.

In other words, according to the present invention, since the calculation of the sum data for each block and the integration processing thereof are always performed, the processing time is short, and therefore, other controls are hardly affected. Further, when there is a request for sum data from the outside, all the stored sum data can be output as it is, so that the waiting time is short.

Further, since the waiting time is short as in the case of the first aspect, even if the system determines the CPU abnormality at the rotation speed of the main routine, it is not erroneously determined that the CPU is abnormal. Also, when the tool performs the timeout process, the communication is reliably established. In addition, since all the sum data can be output in response to an external request, it is possible to check for unauthorized modification of the program based on the entire sum data.

(4) An electronic control unit provided with a normal RAM as means for storing the total sum data, wherein the total sum data is stored until the calculation of the total sum data is completed after the power is turned on. The electronic control device according to any one of claims 1 to 3, wherein output to the outside is prohibited or a request from the outside is not accepted.

In the present invention, all the sum data is converted to the normal R
AM (RAM in which data is not guaranteed when ignition is off) is stored. Therefore, immediately after the power is turned on (ignition on), there is a possibility that sufficient block-by-block sum data for calculating all the sum data may not be obtained. Output is prohibited or external requests are not accepted. This can prevent an erroneous value from being output as correct total sum data.

(5) An electronic control unit having a standby RAM as means for storing the total sum data, wherein the total sum data is stored when the contents of the standby RAM are destroyed. The electronic control device according to any one of claims 1 to 3, wherein output to the outside is prohibited or the request from the outside is not accepted until the calculation of the data is completed.

According to the present invention, all the sum data is stored in the standby RAM (RAM in which data is guaranteed even when the ignition key is turned off, but data is not guaranteed when no voltage is supplied from the battery). . Therefore, if the contents of the standby RAM are destroyed, for example, when the battery is removed, all the sum data is not guaranteed, and output to the outside is prohibited until all the sum data can be calculated. Or do not accept external requests. This can prevent an erroneous value from being output as correct total sum data.

(6) The invention according to claim 6 is a storage device for storing the total sum data, comprising a standby RAM and an EE-RAM.
An electronic control device including a PROM, wherein when the contents of the standby RAM are destroyed, all the sum data stored in the EE-PROM is stored in an external memory until the calculation of the total sum data is completed. The electronic control device according to any one of claims 1 to 3, wherein the electronic control device outputs the data.

In the present invention, all the sum data is stored in the standby RAM and the EE-PROM (rewritable ROM capable of holding data without power supply). Therefore, even if the battery is removed and the contents of the standby RAM are destroyed, the entire sum data is stored in the EE-PROM. Can be output.

(7) An electronic control unit having an EE-PROM as means for storing the total sum data, wherein the rewriting of the EE-PROM is performed by holding the EE-PROM. The gist of the electronic control device according to any one of claims 1 to 3, wherein the electronic control device is implemented only when the content is different from the current calculation result.

In the EE-PROM, the number of times of rewriting is usually limited. Therefore, as in the present invention, rewriting is performed only when the content held in the EE-PROM (for example, the value at the time of shipment from the factory) and the current calculation result are different. If implemented, the EE-PR
The life of the OM can be extended.

(8) The electronic control apparatus according to any one of claims 1 to 7, wherein the program is an engine control program. The present invention exemplifies the types of programs. Therefore, this electronic control device is an electronic control device for engine control.

That is, if the sum data is obtained as described above, the engine control is not so burdensome, so that the engine control can be suitably performed. (9) According to a ninth aspect of the present invention, there is provided a recording medium having recorded therein means for realizing the function of the electronic control device according to any one of the first to eighth aspects.

The present invention shows a recording medium in which means (for example, a program) for realizing the functions of the electronic control unit are recorded. That is, the function of realizing the electronic control device as described above in a computer system can be provided, for example, as a program activated on the computer system side. In the case of such a program, for example, it can be used by recording it on a computer-readable recording medium such as a floppy disk, a magneto-optical disk, a CD-ROM, or a hard disk, and loading and activating the computer system as needed. it can.

In the above-described present invention, the block-by-block sum data is the sum data obtained by integrating the program code of each block, and the total sum data is the sum of all the block-by-block sum data. Things. It should be noted that when simply referred to as sum data, it is a comprehensive concept including both of the above-mentioned sum data. The term “external” refers to, for example, an external tool similar to that for obtaining diagnosis data, an external personal computer, or the like.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment (embodiment) of an electronic control unit and a recording medium according to the present invention will be described with reference to the drawings. First Embodiment a) First, a basic configuration of an electronic control unit for engine control according to the present embodiment will be described.

As shown in FIG. 1, an electronic control unit (hereinafter simply referred to as engine ECU) 1 for controlling an engine according to the present embodiment.
Is a device mainly composed of a microcomputer 3, which takes in an operation signal S1 of the vehicle such as an engine speed signal and a vehicle speed signal, and outputs a control signal S2 for ignition control, fuel injection control and the like. , And communicates with the external tool 5. The engine ECU 1 is started when an ignition key 9 connected to the battery 7 is turned on. The details will be described below.

The engine ECU 1 includes an input interface circuit 11, an output interface circuit 13, an A / D converter 15, an EE-
PROM (E ² -PROM) 17, power regulator 1
9 is provided. The microcomputer 3 includes a well-known CPU 21, an input / output port (I / O) 23, a timer 2
5, a RAM 27, a standby RAM 29, and a ROM 31.

The RAM 27 is a memory for holding the contents (data) while the ignition key 9 is turned on by the main power supply of the microcomputer 3. The main power supply is a power supply for supplying electric power from the battery 7 to the microcomputer 3 via the ignition key 9 and the power supply regulator 19.

The standby RAM 29 stores the ignition key 9 by the sub power supply of the microcomputer 3.
Is a memory that retains the contents even if is turned off. Note that the sub power supply is a power supply that supplies power to the microcomputer 3 from the battery 7 via the power supply regulator 19.

The EE-PROM 17 includes a main power supply,
This is a rewritable nonvolatile memory that can retain its contents even if the sub power supply goes down. In the engine ECU 1, the operation signal of the vehicle is transmitted via the input interface circuit 11, and the analog signal is further transmitted to A
The data is input to the microcomputer 3 via the / D converter 15. The CPU 21 reads the ROM 3 based on the signal.
In accordance with an engine control program stored in the CPU 1, arithmetic processing is performed, and an ignition signal and an injector drive signal are output via the output interface circuit 13.

The external tool 5 is a tool such as an inspection device for obtaining a diagnosis output. The external tool 5 is not normally connected to the engine ECU 1 but is connected to the engine ECU 1 when data is collected. hand,
Communication such as a request for sum data is performed. Note that a personal computer capable of various data processing may be used as the external tool.

Therefore, in this embodiment, the external tool 5
Outputs a request for the sum data of the engine control program stored in the ROM 31, the request is input to the microcomputer 3 via the input interface circuit 11. Then, in response to this request, the microcomputer 3 outputs the sum data (specifically, all the sum data) to the external tool 5 via the output interface circuit 13.

B) Next, the processing performed by the engine ECU 1 of this embodiment will be described. 2. Main Routine As shown in the flowchart of FIG. 2, after the power is turned on, the RAM 27, the I / O 23, and the like are initialized in Step 100, and then the process proceeds to the main routine shown in a closed loop from Step 110.

In the main routine, various controls (0 to m +
The program of 1) is executed. In the present embodiment, in step 130, a process of creating sum data obtained by integrating the program codes of the engine control program is executed. In the present embodiment, the process of creating the sum data is executed every round of the main routine, but there is no problem if it is executed once every predetermined time.

Although not shown, in addition to the main routine, there are interrupt routines activated by various interrupt factors, and various control programs are executed by these interrupt routines. Here, the above-mentioned program (ie, engine control program) will be described.

Address information for dividing the program into a plurality of blocks is set. That is, the ROM 31
In addition to the above-mentioned program, not only the program is stored, but also address information of a start address and a stop address for dividing the program into several parts in order to obtain block-by-block sum data (a value obtained by integrating a program code for each block). It is remembered.

Specifically, as shown in FIG.
If the M capacity is $ FE0000 to $ FFFFFF and the block size is $ 400, the number of blocks is
($ FFFFFF- $ FDFFFF) / $ 400 = 12
It becomes 8. Accordingly, in order to store the block-by-block sum data corresponding to each block, that is, from the start address to the stop address of each block, the RAM 27 stores an area (A1) for storing each block-by-block sum data.
To A128).

Separately from this, the standby RAM 2
9 and the EE-PROM 17 are provided with areas (B, C) for storing all the sum data, which is a value obtained by summing the block-by-block sum data. Note that the standby RAM 2
9 and the EE-PROM 17 may store all the sum data. The block-by-block sum data and the total sum data are the total value of a part or the whole of the program code. Any sum check can be performed. Instead, only the numerical value of one copy (for example, lower 2 bits) may be stored.

This process is a process of calculating the sum data of each block and summing up the sum data of each block to calculate all the sum data. .

As shown in step 200 of the flowchart of FIG. 4, the program code of the n-th block is integrated unconditionally. Here, the initial value of the counter n is 1. In the following step 210, the result is stored in the R corresponding to the block number as shown in FIG.
It is stored in the n-th area (An) of the AM 27.

In the following step 220, it is determined whether or not the integration of all the blocks has been completed, based on whether or not the integration of which block is currently completed. Therefore,
When the integration of the 128th block is completed, each integration in all blocks is completed.

If it is determined that the integration has not been completed for all the blocks, step 230 is executed.
Then, n is incremented in order to perform the integration of the next block, and the present process is ended once (that is, returns to the main routine). On the other hand, if a positive determination is made here, step 2
Proceed to 40.

In step 240, since each integration in all blocks has been completed, the storage area (A
1 to A128), and sums all the block-by-block sum data to calculate the total sum data. In the following step 250, all the sum data is stored in the standby RAM 29.
In the storage area (B).

In the following step 260, it is determined whether or not all the sum data matches a value already stored in the EE-PROM 17 (for example, a value at the time of factory shipment). If the determination is affirmative, the process proceeds to step 280, whereas if the determination is negative, the process proceeds to step 270.

In step 270, since all the sum data is a new value, the entire sum data is stored in the EE-PROM1.
7 is stored in the storage area (C). In the following step 280, n, which is a counter indicating the number of the current block to be integrated, is initialized to 1, and the present process is ended once.

By the above-described processing, all the sum data can be calculated and stored. External Tool Handling Process This process is a process executed by the engine ECU 1 when the external tool 5 requests sum data.
Here, when the sum data is requested, if all the sum data, which is the total integrated value, is immediately stored, the entire sum data is output immediately.

As shown in the flowchart of FIG. 5, in step 300, it is determined whether or not there is a request for sum data from the external tool 5. Here, if the determination is affirmative, the process proceeds to step 310, while if the determination is negative, the process is temporarily terminated. In the following step 310, the standby RAM 2
It is determined whether or not the contents of No. 9 are destroyed (for example, by disconnection of the battery 7). If an affirmative determination is made here, the process proceeds to step 320;
Go to 0.

For example, the power supply voltage supplied to the CPU 21 is monitored, and when the voltage drops below a predetermined value, it is determined that the contents of the standby RAM 29 have been destroyed. If a predetermined keyword is stored in the standby RAM 29 and the keyword cannot be read, it is determined that the contents of the standby RAM 29 have been destroyed. When the power is turned on after the contents of the standby RAM 29 are destroyed, a predetermined initial value is set as the total sum data.

At step 320, the standby RAM 2
Since the contents of No. 9 have been destroyed, it is determined whether or not the integration of all the newly started blocks has been completed, for example, by a flag indicating the completion of the calculation. If the determination is affirmative, the process proceeds to step 340, whereas if the determination is negative, the process proceeds to step 340.
Go to 30.

In step 330, the standby RAM 2
EE not destroyed because the contents of 9 are destroyed
-All the sum data stored in the PROM 17 is
The value of DATA of M27 is used. On the other hand, in step 340, since the contents of the standby RAM 29 have not been destroyed (No in step 310) or all the sum data has been newly calculated (Yes in step 320), all of the data stored in the standby RAM 29 has been calculated. Let the value of the sum data be the value of DATA in the RAM 27.

Then, in step 350, the value of DATA (that is, the total sum data) is transmitted to the external tool 5, and the present processing is terminated. That is, if the contents of the standby RAM 29 are not destroyed,
Is transmitted to the external tool 5 as it is, while the standby RAM 2
9 has been destroyed, the EE-PROM 1
The value of DATA stored in 7 (for example, all the sum data at the time of factory shipment) is transmitted to the external tool 5.

C) By the processing described above, in this embodiment,
The following effects are obtained. In this embodiment, the program code is integrated for each block of the program to obtain sum data for each block, and the sum data is stored in the RAM 27 for each block. And
When all block-by-block sum data has been calculated, all block-by-block sum data are summed to obtain all-sum data, and this value is stored in the standby RAM 27.

In other words, since the integration processing of only one block is always performed unconditionally at a predetermined cycle (every cycle of the main routine), the processing time is short, and therefore, the revolving speed of the main routine becomes extremely long. Nothing. for that reason,
It does not affect other controls.

Further, since all the sum data is held, when an external tool 5 requests a sum data, it can immediately respond. That is, when the external tool 5 requests the sum data, the standby RAM 27
Can be promptly output.

Further, since there is no need to wait for a long time until the response from the request from the external tool 5, even if the system determines the CPU abnormality at the rotation speed of the main routine, it is erroneously determined that the CPU is abnormal. Never do. In addition, even when a timeout process is performed on the tool side, a quick response is possible, so that there is an advantage that communication is reliably established.

If the battery 7 or the like is abnormal and an appropriate power supply voltage is not supplied, the value of the standby RAM 27 is not guaranteed, but in this embodiment, the total sum data is newly calculated. Up to this point, the already stored value of the EE-PROM 17 is output to the external tool 5, so that the external tool 5 can respond immediately without waiting until the total sum data is calculated.

The rewriting of the EE-PROM 17
Since the operation is performed when the content held in the E-PROM 17 and the current calculation result are different, there is an advantage that the number of rewriting can be reduced and the life is long. (Embodiment 2) Next, Embodiment 2 will be described.

The description of the same parts as in the first embodiment is as follows.
Omitted or simplified. In this embodiment, the sum data for each block is normally accumulated, and when there is a request for the sum data from an external tool, the sum data for each block is summed to obtain the total sum data.

The sum data creation processing of the present embodiment is the same as that shown in FIG.
As shown in the flowchart of FIG. 7, in step 400, the block-by-block sum data of the n-th block is unconditionally calculated. Note that the initial value of n is 1. Subsequent step 41
In the case of 0, the sum data for each block calculated this time is stored in the area of the standby RAM 29 set corresponding to this block. Note that the information may be stored in the normal RAM 27.

In the following step 420, it is determined whether or not the calculations for all the blocks have been completed. If the determination is affirmative, the process proceeds to step 440. If the determination is negative, the process proceeds to step 430. In step 430, the counter n
Is incremented, and the present process is ended once (that is, the process returns to the main routine).

On the other hand, in step 440, since calculation of all block-by-block sum data has been completed, n is set to 1 and the present process is terminated once. In the external tool handling process of this embodiment, as shown in the flowchart of FIG. 7, first, at step 500, it is determined whether or not there is a request for sum data from the external tool 5. If a positive determination is made here, the process proceeds to step 510,
On the other hand, if a negative determination is made, the present process is ended once.

At step 510, the standby RAM 2
The sum data for each block stored in 9 is integrated to calculate the total sum data. In the following step 520, all the sum data is stored in the standby RAM 29. In a succeeding step 530, all the sum data is output to the external tool 5, and the present process is ended once.

In the case of the present embodiment, although it takes some time from the request of the sum data to the output thereof in comparison with the first embodiment, the same effects as in the first embodiment can be obtained. For example, in the case of a program size of 128 Kbytes, integration of every 2 bytes, processing time of one integration of 1 μs, and a margin of main circulation speed of 1 ms, the size of one block is 1 ms.
× 2 bytes / 1 μs = 2 Kbytes, for a total of 128 bytes
Although the processing time of integration for 64 times of (Kbyte / 2Kbyte) is required, since the processing time of one integration is 1 μs, the response is only delayed by 64 × 1 μs = 64 μs. Third Embodiment Next, a third embodiment will be described.

The description of the same parts as in the first embodiment is as follows.
Omitted or simplified. The present embodiment is characterized in the sum data creation processing, and always calculates the sum data for each block and sequentially integrates them. In the sum data creation processing of this embodiment, as shown in the flowchart of FIG. 8, in step 600, the block-by-block sum data of the n-th block is unconditionally calculated. Note that the initial value of n is 1.

In the following step 610, the block-based sum data calculated this time is added to the integrated value of the block-based sum data up to the previous time to calculate the integrated value up to this time.
In the following step 620, it is determined whether or not all the blocks have been calculated. If the determination is affirmative, the process proceeds to step 640. If the determination is negative, the process proceeds to step 630.

At step 630, the counter n is incremented, and the present process is ended once (ie, returns to the main routine). On the other hand, in step 640, since the integration of all block-by-block sum data is completed, the value is stored in the standby RAM 29 as all-sum data.

In the following step 650, n is set to 1, and the present process is ended once. Thus, in this embodiment,
Since the sum data for each block is sequentially added to obtain the total sum data, it takes some calculation time for each block. However, similar to the first embodiment, when the external tool 5 requests the sum data, Can output all sum data immediately. (Embodiment 4) Next, Embodiment 4 will be described.

The description of the same parts as in the first embodiment is as follows.
Omitted or simplified. The present embodiment is an example in which the EE-PROM is not used. As shown in the flowchart of FIG.
At 0, it is determined whether or not there is a request for sum data from the external tool 5. If a positive determination is made here, step 71
Then, if the determination is negative, the process is temporarily terminated.

At step 710, the standby RAM 2
It is determined whether the content of No. 9 is destroyed. If the determination is affirmative, the process proceeds to step 720, while if the determination is negative, the process proceeds to step 730. In step 720, since the contents of the standby RAM 29 have been destroyed, it is determined whether the integration of all newly started blocks has been completed. If an affirmative determination is made here, the process proceeds to step 740. On the other hand, if a negative determination is made, the process is temporarily terminated.

On the other hand, in step 730, the standby R
Since the contents of the AM 29 have not been destroyed (No in Step 710) or all the sum data has been newly calculated (Yes in Step 720), the standby RAM 29
The value of all the sum data stored in
Let it be the value of TA.

Then, in step 740, the value of DATA (all the sum data) is transmitted to the external tool 5, and the present process is terminated once. In this embodiment, when the contents of the standby RAM 29 are destroyed, the process waits until new sum data is newly calculated, and outputs the value after all the sum data is calculated. Therefore, erroneous data is not output.

The present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes without departing from the present invention. (1) For example, a standby RAM is preferably used as the storage unit for storing the summation result of the block-by-block sum data and the storage unit for storing the value of the counter n indicating the number of blocks in which the integration has been completed.

This is because, in the case of a normal RAM, if the ignition key is turned off, the operation result is not held. (2) In the case where data is stored in the normal RAM, data necessary for calculating all sum data is not available for a predetermined period (until the integration of all blocks is completed) after the power is turned on. It is desirable to stop the output of the operation result (all sum data) even when a request from an external tool is received, or to take measures to prevent the request from the external tool from being accepted.

(3) Also, when the contents of the standby RAM are destroyed and initialized, similarly, after the initialization, for a predetermined period (until the integration of all blocks is completed), the operation result (all sum data) It is desirable to stop the output of (2) or take measures to not accept requests from external tools.

(4) The present invention can be applied not only to the engine ECU but also to a recording medium storing means for executing the above-described processing. Examples of the recording medium include various recording media such as a microchip, a floppy disk, a hard disk, and an optical disk. That is, there is no particular limitation as long as it stores means such as a program that can execute the processing of the electronic control device described above.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a schematic configuration of an electronic control device according to a first embodiment.

FIG. 2 is a flowchart illustrating a main routine according to the first embodiment.

FIG. 3 is an explanatory diagram illustrating a storage area of a memory used in the first embodiment.

FIG. 4 is a flowchart illustrating sum data creation processing according to the first embodiment.

FIG. 5 is a flowchart illustrating an external tool handling process according to the first embodiment.

FIG. 6 is a flowchart illustrating a sum data creation process according to a second embodiment.

FIG. 7 is a flowchart illustrating an external tool handling process according to the second embodiment.

FIG. 8 is a flowchart illustrating a sum data creation process according to a third embodiment.

FIG. 9 is a flowchart illustrating an external tool handling process according to the fourth embodiment.

[Explanation of symbols]

1 ... electronic control unit 3 ... microcomputer 5 ... external tool 7 ... power supply 9 ... ignition key ^{17 ... EE-PROM (E 2} -PROM) 27 ... RAM ( normal RAM) 29 ... standby RAM

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiyuki Kato 1-1-1, Showa-cho, Kariya-shi, Aichi F-Term in Denso Corporation (reference) 3G084 BA13 BA15 BA16 DA05 DA27 DA31 EB02 EB06 FA05 FA33 5B018 GA03 GA06 HA13 HA23 HA31 HA35 JA26 KA22 LA04 MA12 MA13 MA16 MA23 NA01 NA04 NA06 QA05 RA12

Claims (9)

[Claims] A program is divided into a plurality of blocks, and normally, a block-by-block sum data generating unit for sequentially generating block-by-block sum data of each block at predetermined intervals, and a program which is generated by the block-by-block sum data generating unit. A block-by-block sum data storage unit for storing each block-by-block sum data in each storage area; and, if all block-by-block sum data is stored in the block-by-block sum data storage unit, all block-by-block sum data. A total sum data calculating means for accumulating the data to obtain a total sum data; a total sum data storing means for storing the total sum data calculated by the total sum data calculating means; In this case, there is provided an all-sum data output unit that outputs all the sum data stored by the all-sum data storage unit. An electronic control unit, characterized in that. 2. A program which is divided into a plurality of blocks, and which is normally created by a block-by-block sum data creating means for sequentially creating block-by-block sum data of each block at predetermined intervals. A block-by-block sum data storage unit for storing the block-by-block sum data in each storage area; and, when there is an external request for the sum data, a block-by-block sum data storage unit. A total sum data calculating means for integrating the sum data to obtain the total sum data; and a total sum data output means for outputting the total sum data calculated by the total sum data calculating means. Electronic control unit. 3. A block-by-block sum data generating means for sequentially generating a block-by-block sum data of each block at predetermined intervals, and the program being generated by the block-by-block sum data generating means. A summation means for sequentially summing the sum data for each block, an accumulation value storage means for storing an accumulation value accumulated by the accumulation means, and an accumulation of all the sum data for each block is completed by the accumulation means. In the case where the sum value is stored, the total sum data storage means for storing the integrated value as the total sum data, and when the sum data is requested from outside, the total sum data stored by the total sum data storage means is output. An electronic control device, comprising: 4. An electronic control device provided with a normal RAM as means for storing the total sum data, wherein output to the outside is inhibited after power-on until the calculation of the total sum data is completed. The electronic control device according to any one of claims 1 to 3, wherein the electronic control device does not receive an external request. 5. An electronic control device comprising a standby RAM as means for storing said total sum data, wherein when the contents of said standby RAM are destroyed, the calculation of said total sum data is completed. The electronic control device according to any one of claims 1 to 3, wherein output to the outside is prohibited or a request from the outside is not accepted. 6. An electronic control device comprising a standby RAM and an EE-PROM as means for storing the total sum data, wherein the calculation of the total sum data is performed when the contents of the standby RAM are destroyed. Until the end, the EE-P
4. The electronic control device according to claim 1, wherein all the sum data stored in the ROM is output to the outside. 7. An electronic control device having an EE-PROM as means for storing the total sum data, wherein the rewriting of the EE-PROM is performed by comparing the contents held in the EE-PROM with the current calculation result. The electronic control device according to any one of claims 1 to 3, wherein the electronic control device is performed only when the conditions are different. 8. The electronic control device according to claim 1, wherein the program is a program for controlling an engine. 9. A recording medium on which is recorded means for realizing the function of the electronic control device according to claim 1. Description: