JP2008065514A - Control device of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily reproduce an abnormal state of a vehicle. <P>SOLUTION: When a request to reproduce the abnormal state is input from an external device such as a tester, it is determined whether a corresponding processing variable (operation parameter) of an ECU1 is rewritten based on the data in the abnormal state stored in memory of the ECU, data determined to be rewritten is written into the corresponding processing variable, and the other data, namely usually communicated/input processed data, is written into the corresponding processing variable. Then, an electric apparatus is controlled using this processing variable, and the abnormal state is reproduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control device that easily reproduces the abnormal state of a vehicle.

Some vehicle control apparatuses have a function of storing control parameters and the like at the time when an abnormality occurs, and the stored control parameters are generally used as data such as the cause of a malfunction state.
In Patent Document 1, in the diagnosis of the electronic control unit (ECU), the input / output state of the ECU when an abnormality occurs is stored in the memory of the ECU.
JP 2003-84998 A

When reproducing the state indicated by the saved parameter as described above, it is necessary to set the vehicle or test device so that it becomes the same value as the saved value, but it may be difficult to set depending on the situation In some cases, abnormal state analysis could not be performed efficiently.
The present invention has been made paying attention to such a conventional problem, and an object thereof is to make it possible to efficiently analyze an abnormal state of a vehicle.

For this reason, the invention according to claim 1
In a control device that is mounted on a vehicle and has a function of storing data at the time of abnormality and a communication function with an external device,
When an abnormal state reproduction command is input from the external device, the operation parameter of the control device is set to a value based on the abnormal data to reproduce the abnormal state.

According to the invention of claim 1,
When the control device detects an abnormal state of the vehicle and the data at the time of abnormality is stored, the operation parameter of the control device is based on the data at the time of the abnormality when an abnormal state reproduction command is input from the external device When the value is set to a value and the control device performs control using the set operation parameter, the state at the time of abnormality can be easily reproduced.

The invention according to claim 2
During reproduction of the abnormal state, a data write request to the control device is restricted or prohibited.
According to the invention of claim 2,
If the abnormal data is rewritten with the data input during normal control during the reproduction of the abnormal state, it will affect the reproduction. By restricting or prohibiting the data write request, the influence on reproduction is prevented.

The invention according to claim 3
The reproduction to the abnormal state is started when a vehicle driving state capable of shifting to the reproduction is started.
According to the invention of claim 3,
It is possible to reproduce the abnormal state smoothly and accurately by starting the reproduction after determining that the vehicle is in a driving state capable of shifting to the reproduction.

Embodiments of the present invention will be described below.
FIG. 1 shows an outline of a basic overall system common to the embodiments.
In FIG. 1, an ECU (electronic control unit) 1 mounted on a vehicle performs various types of information communication (input / output) between the microcomputer 11 and the microcomputer 11 and an external communication device. A communication / input circuit 12 for inputting signals from various sensors and the like provided to the microcomputer 11 and various control signals calculated by the microcomputer 11 to input electrical devices 2 such as solenoids, lamps and motors. And a drive circuit 13 that outputs as a drive signal, and has a function of storing data (information) before and after occurrence in a memory when a vehicle abnormality occurs.

For example, as shown in the figure, the data on the state at the time of abnormality is stored in a predetermined period before and after the occurrence of abnormality, such as throttle opening, vehicle speed VSP, engine rotation speed Ne, turbine rotation speed of automatic transmission, range position, gear. Data such as position and fail state (whether or not fail-safe control is executed) is stored every 10 ms.
FIG. 2 shows a flow when the ECU 1 reproduces the abnormality using the data in the abnormal state when the abnormality occurs.

In step S <b> 1, it is determined whether a request to reproduce the abnormal state is input from an external device such as a tester described later.
If it is determined that the reproduction request has not been input, the process proceeds to step S2, where normal input / communication processing is performed via the communication / input circuit 12, and a drive signal is output from the drive circuit 13 in step S3. The electrical device 2 is controlled by outputting.

On the other hand, if it is determined in step S1 that an abnormal state reproduction execution request has been input, the process proceeds to step S4, and a counter that counts the time required to read data stored in the memory when an abnormal state occurs is set. initialize.
Next, in step S5, it is determined whether the counting of the counter has been completed. If it is determined that the counter has not been completed, the process proceeds to step S6.

In step S6, it is determined whether or not the corresponding processing variable (operation parameter) of the ECU 1 is to be rewritten with the abnormal state data. If it is determined to rewrite, the process proceeds to step S7, and this data is written in the processing variable. .
If it is determined in step S6 that the corresponding variable is not rewritten with the data in the abnormal state, the process proceeds to step S8, and the data subjected to normal communication / input processing is written for the corresponding variable.

After writing data in step S7 or step S8, the counter is incremented in step S9, and the process returns to step S4.
If it is determined in step S4 that the count value of the counter has reached the set value and writing of the necessary data in the abnormal state has been completed, the process proceeds to step S3 and the processing variable in which the abnormal state data has been written. Is used to control the electrical equipment 2 to reproduce the abnormal state. During the reproduction of the abnormal state, the variable in which the abnormal state data is written is prohibited from being updated with data by normal input / communication processing, and stable reproduction control can be performed.

In this way, the abnormal state data stored at the time of the abnormality is written to the corresponding processing variable while the data input from the communication / input circuit 12 is limited or prohibited by the input of the abnormal state reproduction execution request. By controlling with, the abnormal state can be easily reproduced.
Hereinafter, embodiments using various external devices will be described.

FIG. 3 shows an embodiment in which reproduction is performed by the ECU 1 alone, and shows an example in which a tester (or personal computer) 21 is used as an external device.
That is, the tester 21 instructs the ECU 1 to reproduce the abnormal state, and the flow of FIG. 2 is started using this command as a trigger to reproduce the abnormal state.
In this embodiment, in order to perform the simplest reproduction by the ECU 1 alone, a fixed value set in advance is used as the data value written as normal data in step S8 of FIG.

FIG. 4 shows an embodiment in which a tester (or personal computer) 21 and a checker 22 are used together to reproduce an abnormal state. Here, the checker 22 is a device that can output various signals input from the vehicle to the ECU 1 under normal control as pseudo signals for diagnosis of the ECU 1 and the like.
First, the tester 21 instructs the ECU 1 to reproduce the abnormal state using the checker 22 together.

In response to the command, the ECU 1 sets the input of the checker 22 to the initial value of the abnormal state data stored in the memory.
Next, before reproduction, for each input signal corresponding to each processing variable, it is specified whether to use the data stored in the abnormal state or the input signal from the checker.
After the above setting, the flow shown in FIG. 2 is started.

In this way, when it is determined in step S6 in FIG. 2 that the stored data in the abnormal state is not written, the input signal from the checker 22 is written and the reproduction is performed. Compared to the first embodiment that performs the above, the abnormal state can be reproduced with higher accuracy.
FIG. 5 shows an embodiment in which an abnormal state is reproduced by using a tester (or personal computer) 21 and an automobile 23 (signals from various sensors provided in the vehicle).

First, the tester 21 instructs the ECU 1 to reproduce the abnormal state using the automobile 23 together.
The vehicle is driven to approach an abnormal driving state, and the timing at which the input signal from the vehicle 23 substantially matches the initial value of the abnormal state data stored in the memory is set as the reproduction start timing.

Next, before reproduction, for each input signal corresponding to each processing variable, it is specified whether to use the data stored in the abnormal state or the input signal from the automobile 23.
After the above setting, the flow shown in FIG. 2 is started when the reproduction start timing set as described above is reached.
In this way, the abnormal state is reproduced after the actual driving state of the vehicle is brought close to the abnormal state, and data other than the abnormal state data used for reproduction is provided in the vehicle 23 ( Since signals from various sensors) are used, it is possible to smoothly start the reproduction of the abnormal state and to reproduce the state closer to the actual state.

  In the second and third embodiments, the tester (or personal computer) 21 sets a vehicle state capable of reproducing the abnormal state from a database or the like in advance based on the stored abnormal state data. It is also possible to adopt a configuration in which the screen is displayed, and it is also possible to detect that the vehicle is in the set state and automatically start reproduction control of the abnormal state.

Furthermore, it is good also as a structure which performs control until the reproduction control of these vehicles side is started by simulation control from a simulation apparatus.
FIG. 6 shows an embodiment in which the abnormal state is reproduced using the ECU 24 not detecting the abnormal state.
First, the tester 21 instructs the ECU 1 to reproduce the abnormal state by using the ECU 24 that has not detected the abnormal state.

The abnormal state data stored in the memory of the ECU 1 is transferred to the memory of the ECU 24 that has not detected the abnormal state via a data communication line or the like.
After the above setting, the flow shown in FIG. 2 is started simultaneously by the two ECUs 1 and 24.
In this way, the two ECUs 1 and 24 can compare whether the ECUs 1 and 24 perform the same movement, and can diagnose whether the ECU 1 itself is abnormal.

  In the above embodiment, after the abnormal state data stored in the memory of the ECU 1 is transferred to the memory of the ECU 24, the abnormal state is reproduced by each of the ECUs 1 and 24 alone as in the first embodiment. After the abnormal state data is transferred to the memory of the ECU 24, each of the ECUs 1 and 24 reproduces the abnormal state using both a checker and a car as in the second and first embodiments, and compares the two. You may do it.

Next, inventions other than those described in the claims that can be grasped from the above-described embodiment will be described together with the effects thereof.
(A) In the vehicle control device according to any one of claims 1 to 3,
The external device is a tester or a personal computer.
According to such a configuration,
The abnormal state can be easily reproduced by operating a tester or a personal computer.
(B) In the vehicle control device according to (a) above,
A checker is used in combination as the external device.

According to such a configuration,
The abnormal state can be accurately reproduced by inputting the pseudo signal on the vehicle side to the control device by the checker.
(C) In the vehicle control device described in (a) above,
An automobile is used in combination as the external device.

According to such a configuration,
Reproduction of the abnormal state can be reproduced closer to the actual state.
(D) In the vehicle control device described in (a) above,
As the external device, another control device (ECU) that does not store abnormal state data is used.

According to such a configuration,
It is possible to diagnose the presence or absence of abnormality of the control device itself while comparing whether the two control devices (ECU) perform the same movement.

The block diagram which shows the outline | summary of the basic whole system common to each embodiment of this invention. The flowchart reproduced using the data at the time of abnormality. The block diagram which shows the outline | summary of 1st Embodiment which reproduces only with ECU. The block diagram which shows the outline | summary of 2nd Embodiment which reproduces the state at the time of abnormality using a tester (or personal computer) and a checker together. The block diagram which shows the outline | summary of 3rd Embodiment which reproduces the state at the time of abnormality using together a tester (or personal computer) and a motor vehicle (signal from the various sensors provided in). The block diagram which shows the outline | summary of 4th Embodiment which reproduces the state at the time of abnormality together with ECU which has not detected the state at the time of abnormality.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... ECU (electronic control apparatus), 2 ... Electrical equipment, 11 ... Microcomputer, 12 ... Communication / input circuit, 13 ... Drive circuit, 21 ... Tester (or personal computer), 22 ... Checker, 23 ... Car, 24 ... Abnormal ECU not storing time state data

Claims (3)

In a control device that is mounted on a vehicle and has a function of storing data at the time of abnormality and a communication function with an external device,
When an abnormal state reproduction command is input from the external device, the operation parameter of the control device is set to a value based on the abnormal data to reproduce the abnormal state. Control device.   2. The vehicle control device according to claim 1, wherein a request to write data to the control device is restricted or prohibited while the abnormal state is being reproduced.   The vehicle control device according to claim 1 or 2, wherein the reproduction to the abnormal state is started when a vehicle operation state capable of shifting to the reproduction is reached.

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