JP7053339B2 - Failure diagnosis device - Google Patents

Description

The present invention relates to a failure diagnosis device that stores diagnostic data related to a failure when a failure of an in-vehicle device is detected.

The vehicle failure diagnosis device is installed in the control device (ECU) that controls the vehicle system such as the engine, brake, airbag, and car navigation, and monitors the system status of the ECU to detect an abnormality. Make a diagnosis. When the failure is detected, the failure diagnosis device stores diagnostic data including a failure code and various information when the failure occurs, and notifies the occurrence of the failure by display or the like. In addition, the time when the failure occurs is also stored. Here, it is described in Patent Document 1 that time data is generated based on a signal received from a GPS satellite as clock information. Since this time data is based on the clock information received from the atomic clock mounted on the GPS satellite, it is an accurate time.

Japanese Unexamined Patent Publication No. 10-160642

By the way, the time displayed on the display of the meter device of the vehicle is usually automatically generated based on the clock information transmitted from the GPS satellite. When a failure occurs, the failure diagnosis device acquires the clock information held by the meter device. Here, the clock information of the meter device can be manually corrected, and the user can change the time to any time. If the clock information of the meter device is changed by the user, the time when the failure occurs will not be accurate if this clock information is provided.

Even if we try to read out the diagnostic data and specify the time of occurrence in order to analyze the failure, we cannot tell which clock information it is. Therefore, the credibility of the clock information is low, which may hinder the analysis of the failure.

In view of the above, an object of the present invention is to provide a failure diagnosis device capable of reliably grasping the credibility of clock information when a failure occurs.

The failure diagnosis device of the present invention manages a time acquisition unit that acquires clock information regarding the time when a failure occurs, and clock information received from the time acquisition unit together with diagnostic data regarding the failure when a vehicle failure is detected. It is equipped with a control unit. The time acquisition unit is a history indicating whether the automatic correction is performed based on the clock information received from the external device or the correction is performed based on the clock information arbitrarily set by the user. Get information.

In the case of historical information indicating that it is based on clock information received from an external device such as a GPS satellite, the credibility of the clock information is high. In the case of historical information indicating that it is based on clock information arbitrarily set by the user, the credibility of the clock information is low.

According to the present invention, it is possible to recognize whether the clock information before the failure occurs is received from an external device or set by the user, so that the credibility of the clock information at the time of the failure can be surely grasped. It is possible and accurate failure analysis is possible.

A block diagram showing a schematic configuration of a vehicle control system according to an embodiment of the present invention. The figure which shows the example of the pattern which the clock information is corrected

FIG. 1 shows a vehicle control system according to an embodiment of the present invention. The vehicle is equipped with a plurality of control devices (ECUs) 1 for controlling systems such as an engine, a meter, a transmission, a brake, and a car navigation system. These control devices 1 are divided into systems according to functions such as information, control, and safety, and a network is formed for each system. A central gateway (CGW) 2 is provided to centrally manage each network, and buses of each network are connected to the central gateway 2.

For example, an information device such as a display audio (DA) device 3, a car navigation device 4, a communication module 5 that connects to a wireless communication network of a mobile phone and performs communication, and a control device 1 are connected to the information bus. The display audio device 3, the car navigation device 4, and the communication module 5 include a receiver for receiving signals from the GPS satellites 6, and receive clock information from the GPS satellites 6.

Further, a meter device 8 and a control device 1 for controlling the multi-information display (MID) 7 are connected to the control bus. The meter device 8 displays the time on the multi-information display 7. The time is based on the clock information from the GPS satellite 6. When the start switch of the vehicle is on, the car navigation device 4 and the communication module 5 periodically receive clock information from the GPS satellite 6. The car navigation device 4 and the communication module 5 transmit clock information to the meter device 8 through the central gateway 2. When the clock information is input from the car navigation device 4 and the communication module 5, the central gateway 2 gives priority to the clock information of the communication module 5 and transmits the clock information to the meter device 8.

The meter device 8 automatically corrects the time periodically (for example, every minute) based on the clock information received from the central gateway 2, and displays the accurate time. The meter device 8 stores in the memory history information indicating that the clock information is automatically input each time the automatic correction is performed.

The time in the meter device 8 can be arbitrarily changed by the user. If you turn off the automatic correction function on the customize screen for settings, you can enter any clock information. Since the meter device 8 has a built-in timer IC, when the user inputs clock information, the meter device 8 counts the time based on the clock information and displays the changed time. When the user inputs the clock information in this way, the meter device 8 stores the history information indicating that the clock information has been input by the user's operation in the memory.

The control device 1 operates a load such as an actuator or a motor based on the output signal of the sensor. The control device 1 has a built-in failure diagnosis device 10 that executes a self-diagnosis function, and the failure diagnosis device 10 monitors the system state. When an abnormality occurs in the system, the failure diagnosis device 10 determines that the failure has occurred from the output signal of the sensor, stores the failure code, and at the same time, relates to the failure such as the detection value of the sensor when the failure occurs. Stores diagnostic data (freeze frame data).

That is, the failure diagnosis device 10 collects the time acquisition unit 11 that acquires the clock information regarding the time when the failure occurs, and the failure diagnosis data, and manages the clock information received from the time acquisition unit 11 together with the diagnosis data. It has a control unit 12 and a storage unit 13 for storing diagnostic data and clock information.

When a failure occurs, the time acquisition unit 11 outputs a command signal to the meter device 8 so as to display a warning, and acquires clock information when the failure occurs. Upon receiving the command signal, the meter device 8 displays a warning on the multi-information display 7. Further, the meter device 8 always outputs the latest clock information and history information to the network. The time acquisition unit 11 receives clock information and history information from the meter device 8 through the network. The control unit 12 writes diagnostic data, clock information, and history information in the storage unit 13. It is shown that the history information is either automatically corrected based on the clock information received from the outside or corrected based on the clock information arbitrarily set by the user.

After that, the diagnostic data and the clock information are read out at a store or the like, and the failure is analyzed. At this time, the authenticity of the clock information can be confirmed by the history information. That is, it is possible to determine whether or not the stored failure occurrence time is an accurate time. As a result, the failure can be analyzed after recognizing the credibility of the time when the failure occurs, and accurate repair can be performed.

In A of FIG. 2, automatic correction is performed based on the clock information from the GPS satellite 6. In this case, it can be recognized from the history information that the final correction before the failure occurs is the automatic correction. Therefore, the clock information is credible.

In B, automatic correction is performed based on the clock information from the GPS satellite 6, and after the failure occurs, the clock information is corrected by the user's operation. In this case, the displayed time is not accurate, but it can be recognized from the history information that the final correction before the failure occurs is the automatic correction. Therefore, the clock information is credible.

In C, the clock information is corrected by the operation of the user. In this case, the history information makes it possible to recognize that the final correction was made by the user before the failure occurred. Therefore, the clock information is not credible.

In D, the clock information is corrected by the operation of the user, and after the failure occurs, it is changed to the automatic correction. In this case, the displayed time is accurate, but the history information makes it possible to recognize that the final correction was made by the user before the failure occurred. Therefore, the clock information is not credible.

Further, automatic correction is performed based on the clock information from the GPS satellite 6, and the automatic correction is turned off by the user's operation before the failure occurs, but when the user does not input the clock information, the final correction is performed by the history information. It can be recognized that it is an automatic correction. The clock information in this case is credible. Further, if the communication module 5 or the car navigation device 4 fails after the automatic correction, the automatic correction is not performed, but it can be recognized from the history information that the final correction is the automatic correction. Even in this case, the clock information is credible.

It should be noted that the present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention. As an external device for transmitting clock information other than the GPS satellite 6, there are a standard radio wave transmission station, a base station of a mobile phone, an NTP server, and the like, and clock information may be received from such an external device.

1 Control device 4 Car navigation device 5 Communication module 6 GPS satellite 8 Display device 10 Failure diagnosis device 11 Time acquisition unit 12 Control unit 13 Storage unit

Claims (2)

The latest history information and vehicle indicating that either the automatic correction was performed based on the clock information received from the external device or the correction was performed based on the clock information arbitrarily set by the user. A time acquisition unit that acquires clock information related to the time when a failure occurs, a control unit that manages clock information received from the time acquisition unit together with diagnostic data regarding the failure when a vehicle failure is detected, and a history. Equipped with a storage unit for storing information, clock information and diagnostic data ,
The history information includes information indicating whether the final correction before the failure occurred was an automatic correction or was made by the user so that it can be determined whether or not the stored failure occurrence time is an accurate time. A failure diagnosis device characterized by this. The time acquisition unit acquires the latest clock information and history information even after the failure occurs, and the history information is automatically corrected based on the clock information received from the external device after the failure occurs, or the user The failure diagnosis device according to claim 1, further comprising information indicating whether or not correction is performed based on arbitrarily set clock information .

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