JPH05171999A - Failure diagnosing system for vehicle - Google Patents

Abstract

PURPOSE:To keep coordination between abnormality information and error detection information even when an ignition switch is turned off before storage of abnormality information and its error detection information is completed. CONSTITUTION:A failure diagnosing system for vehicle is provided with buffer memories 11, 13 for temporarily storing information on abnormality detected by an abnormality detecting means 10 and error detection information calculated based on the information on abnormality, backup memories 15, 16 for storing the information stored in the buffer memories 11, 13 and transferred from the buffer memories, a transferring means 14 for transferring the information stored in the buffer memories 11, 13 to the backup memories 15, 16, and a termination processing means 19 for continuing the transfer when an ignition switch is turned off during transferring of information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle failure diagnosis system, and more particularly, to a vehicle which stores various kinds of abnormality information when an abnormality occurs and then estimates the cause and location of the failure based on the abnormality information. The present invention relates to a failure diagnosis system.

[0002]

2. Description of the Related Art In order to improve an engine control function, an engine ignition timing control in an automobile or a motorcycle (hereinafter referred to as a vehicle), a fuel injection control using an injector, or the like is equipped with a microcomputer. It has come to be performed by an on-vehicle electronic control unit (ECU).

In a vehicle equipped with such an ECU, the abnormality of the portion related to the signal input to the ECU, E
The abnormality of the part related to the signal output from the CU and the abnormality of the ECU itself are automatically notified to the driver, and the abnormality occurrence location is stored in the battery-backed memory as abnormality information. A vehicle failure diagnosis system that reads out the abnormality information and estimates the cause and location of the failure based on this information is being studied.

Further, in such a system, in order to detect so-called "garbled data" in which the abnormality information stored in the memory is destroyed by noise or the like, the arithmetic operation obtained from the abnormality information after storage of the abnormality information is completed. The sum and the parity are separately stored as error detection information, and then the arithmetic sum and the like newly obtained from the abnormality information and the arithmetic sum and the like stored as the error detection information are sequentially compared, and if they are different, the data is garbled. I try to judge that "has occurred."

By the way, in such a failure diagnosis system, when the ignition switch is turned off and the power supply is cut off while the error detection information is calculated and stored, the error information and the error calculated based on the error information are detected. There is a problem that it is determined that “garbled data” has occurred because the consistency with the detection information is lost.

In order to solve such a problem, for example, when the ECU detects a power failure, "end processing" for continuing the calculation and storage of error detection information is executed, and the "end processing" ends. A method of stopping the operation when the abnormality information and the error detection information are consistent with each other has been conventionally known.

[0007]

However, since a lot of other information is stored in the battery-backed memory together with the abnormality information, it takes some time to calculate the error detection information. There was a case where it could not be dealt with in "End processing". As a result, the stored information and the error detection information become inconsistent, and after the ignition switch is turned on again, the error detection information newly obtained from the stored abnormality information does not match the previously stored error detection information. There was a problem that it was judged that "garbage" had occurred.

An object of the present invention is to solve all the problems of the prior art described above, and to match the abnormality information with the error detection information even if the ignition switch is turned off before the calculation / storage of the error detection information is completed. It's about getting sex.

[0009]

In order to achieve the above-mentioned object, the present invention temporarily provides information on a detected abnormality and error detection information calculated based on the information in a vehicle failure diagnosis system. Storage means for temporarily storing the information, storage means for transferring and storing the information stored in the temporary storage means, transfer means for transferring the information stored in the temporary storage means to the storage means, and the transfer When the ignition switch is turned off, the termination processing means for continuing the transfer is provided.

[0010]

According to the above-mentioned structure, the registration of the abnormality information and the error detection information related to the abnormality information is divided into two stages. In the first stage, the abnormality information and the error detection information are stored in advance in the temporary storage means. In the second stage, these are collectively transferred to the storage means. Therefore, even if the ignition switch is turned off during the transfer in the second stage, the remaining information stored in the temporary storage means is processed in the termination process. Since it is only necessary to transfer (including the error detection information) and the error detection information is not calculated, the transfer can be completed within a short period of time.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of a vehicle failure diagnosis system according to an embodiment of the present invention.

The abnormality detecting means 10 detects an abnormality of the vehicle. When an abnormality is detected, the buffer memory 11 temporarily stores the location of the abnormality as abnormality information.
The error detection information calculation means 12 includes the buffer memory 11
As error detection information for checking the memory content of
For example, arithmetic sum or parity is calculated. Buffer memory 1
3 temporarily stores the calculated error detection information.

The transfer means 14 includes the buffer memory 11
And the error detection information stored in the buffer memory 13 are transferred to the battery-backed memories 15 and 16, respectively.

The transfer determination means 17 determines whether the error detection information calculation means 12 completes the calculation and storage of the error detection information and the transfer means 14 starts the transfer (second step) or not (first step). , And whether the transfer is completed (first stage) or not (second stage). That is, if the transfer is not in progress, the first stage is determined, and if the transfer is in progress, the second stage is determined.

The ignition determination means 18 determines the state of the ignition switch. Termination processing means 19
Performs an end process if the transfer determination means 17 determines that the transfer is in progress (second stage) when the ignition switch is switched from the on state to the off state, and transfers the transfer means 14 for a predetermined time. Control to complete the transfer process.

The error detection information calculation means 20 is equivalent to the error detection information calculation means 12, and the backup memory 1
The error detection information regarding the abnormality information stored in 5 is calculated. The comparing means 21 uses the error detection information stored in the backup memory 16 and the error detection information calculating means 20 again.
The error detection information calculated by is compared.

FIG. 2 is a flow chart showing an embodiment of a process of managing abnormality information by the fault diagnosis system having the above-mentioned configuration.

When the abnormality detecting means 10 detects an abnormality, it is determined in step S101 that the abnormality information needs to be changed, and the process proceeds to step S102. Step S102
Then, the abnormality information stored in the backup memory 15 is transferred to the buffer memory 11, and step S103
Then, the abnormality information transferred to the buffer memory 11 is rewritten according to the detected abnormality.

In step S104, the error detection information relating to the changed abnormality information is converted into error detection information calculation means 1
2 is calculated. In step S105, the calculated error detection information is stored in the buffer memory 13.

In step S106, other interrupt processing is prohibited, and in step S107, the transfer determination means 17
Detects the completion of the storage of the error detection information in the buffer memory 13 and sets "1" in the transfer flag WF.

In step S108, the buffer memory 1
Abnormality information changed in 1 is backup memory 1
5, the error detection information stored in the buffer memory 13 is transferred to the backup memory 16 in step S109.

In step S110, the transfer determination means 17
Detects the completion of the transfer of the error detection information and sets (resets) "0" to the in-transfer flag WF, and thereafter, in step S111, another interrupt process is permitted.

On the other hand, when the ignition judging means 18 judges that the ignition switch has been switched from the on state to the off state, the ending processing means 19 starts the ending processing.

As shown in FIG. 3, in the termination process, the transfer flag WF is determined in step S201, and if the transfer flag WF is "1" (that is, the second stage), it means that the abnormal information is being transferred. The determination is made, and the processing proceeds to step S202. In step S202, the abnormality information of the buffer memory 11 which is being transferred is continuously transferred to the backup memory 15. In step S203, the error detection information stored in the buffer memory 13 is transferred to the backup memory 16.

After that, when performing a failure diagnosis in a maintenance shop or the like, the operator reads out the abnormality information stored in the backup memory 15 and, based on the information, causes the failure.
Estimate the location of the failure. However, if the comparison unit 21 determines that the error detection information does not match, the failure diagnosis based on the abnormality information is not performed.

According to this embodiment, the storage of the abnormality information and the error detection information related to the abnormality information in the backup memory is divided into two stages. In the first stage, the abnormality information and the error detection information are temporarily stored in the buffer memory. In the second stage, these are collectively transferred to the backup memory, so even if the ignition switch is turned off during the transfer in the second stage, it is stored in the buffer memory in the end process. Since it is only necessary to transfer the remaining information (including the error detection information) and the error detection information is not calculated, the transfer can be completed within a short period of time.

Therefore, it becomes possible to complete the processing within the normal termination processing period, and even if the ignition switch is turned off before the calculation and storage of the error detection information is completed, the abnormality information and the error detection information are not separated. Be consistent.

FIG. 4 is a flow chart showing another embodiment of a process of managing abnormality information by the failure diagnosis system having the above-mentioned configuration. In this embodiment, the abnormality information indicates that the state of each part of the vehicle is normal ("0"). )) Or abnormal (“1”) memory map, each time an abnormal is detected,
The bit corresponding to the abnormal place is set to "1" one by one.

When the abnormality detecting means 10 detects an abnormality, it is determined in step S301 that the abnormality information needs to be changed, and the process proceeds to step S302. Step S302
Then, the address information indicating the location of the abnormality is calculated.

In step S303, the bit on the buffer memory 11 designated by the address information is set to "1". In step S304, the error detection information calculation means 12 calculates the error detection information regarding the storage information of the buffer memory 11. In step S305, the calculated error detection information is stored in the buffer memory 13
Memorized in.

In step S306, other interrupt processing is prohibited, and in step S307, the transfer determination means 17
Detects the completion of storage of the error detection information and sets "1" to the in-transmission flag WF.

In step S308, the buffer memory 1
The abnormality information stored in 1 is the backup memory 15
The error detection information stored in the buffer memory 13 is transferred to the backup memory 16 in step S309.

In step S310, the transfer determination means 17
Detects the completion of the transfer of the error detection information and resets the in-transfer flag WF, and then in step S311, another interrupt process is permitted.

Since the termination process when the ignition switch is turned off is the same as that described above, its explanation is omitted.

In the second embodiment described above, the contents stored in the buffer memory 11 are explained as being transferred to the backup memory 15. However, the present invention is not limited to this, and the contents stored in the buffer memory 11 can be used. The backup memory 15 may be rewritten based on this.

FIG. 5 is a flow chart showing a method of rewriting the backup memory 15 based on the stored contents of the buffer memory 11, which corresponds to the process of step S308.

In step S3081, register D (not shown) is cleared. In step S3082, the bit on the register D designated by the address information indicating the abnormal place is set to "1". Step S30
At 83, the value of the register D is added to the backup memory 15.

[0038]

As described above, according to the present invention, the storage of the abnormality information and the error detection information in the backup memory is divided into two stages. In the first stage, the abnormality information and the error detection information are temporarily stored. It is stored in the buffer memory, and in the second stage, these are collectively transferred to the backup memory, so even if the ignition switch is turned off during the transfer in the second stage, it is stored in the buffer memory in the end process. It is only necessary to transfer the remaining information that has been transferred, and the error detection information is not calculated, so the transfer can be completed within a short period of time.

As a result, the processing can be completed within the normal termination processing period, and even if the ignition switch is turned off before the calculation / storage of the error detection information is completed, the abnormality information and the error detection information are Will be consistent.

[Brief description of drawings]

FIG. 1 is a block diagram of a failure diagnosis system that is an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of FIG.

FIG. 3 is a flowchart showing the operation of FIG.

FIG. 4 is a flowchart showing the operation of FIG.

5 is a flowchart showing the operation of FIG. 1. FIG.

[Explanation of symbols]

10 ... Abnormality detecting means, 11, 13 ... Buffer memory, 1
2, 20 ... Error detection information calculation means, 14 ... Transfer means, 1
5, 16 ... Backup memory, 17 ... Transfer determination means,
18 ... Ignition determination means, 19 ... End processing means,
21 ... Comparison means

Claims (1)

[Claims] 1. An abnormality detection means for detecting an abnormality, a first temporary storage means for temporarily storing information on the detected abnormality, and a first error detection information for the information stored in the temporary storage means. First error detection information calculation means for calculating, second temporary storage means for temporarily storing the first error detection information, and transfer of information stored in the first and second temporary storage means First and second storage means for storing the stored information, backup means for backing up the first and second storage means by a battery, and information stored in the first and second temporary storage means for the first and second storage means. Transfer means for transferring to the first and second storage means, termination processing means for continuing the transfer when an ignition switch is turned off during the transfer, and information stored in the first storage means Second error detection information calculation means for calculating the second error detection information relating to the first error detection means, and comparison means for comparing the second error detection information with the first error detection information stored in the second storage means. A failure diagnosis system for a vehicle, comprising: and a failure diagnosis based on the information stored in the first storage means when the comparison means determines that the error detection information matches.