JPH0764601A - Car failure diagnostic device - Google Patents

Abstract

(57) [Summary] [Object] The present invention eliminates the occurrence of battery exhaustion even when a failure diagnosis device is installed for a long period of time, and reliably records various types of information of an in-vehicle electronic control device without trouble. To obtain an automobile failure diagnosis device that can be used. [Structure] A CPU 11A that determines a running state or a stopped state of a vehicle 1 based on a detection signal V, a peripheral IC 9 for recording various information of the vehicle, and a peripheral IC when a stopped state of the vehicle is determined. A peripheral IC including a power supply control means 10 for restricting power supply,
Power supply to the peripheral ICs is controlled by turning off the power supply to the peripheral ICs, and information recording is started by starting the power supply to the peripheral ICs when traveling is determined, and the start and stop of information recording such as various sensor information essential for failure diagnosis. Is automatically performed, and unnecessary power supply at the time of stop is limited to prevent the battery from rising.

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 device, and more particularly to a vehicle failure diagnosis device which prevents battery exhaustion.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing the structure of a conventional automobile failure diagnosis apparatus. In the figure, 1 is a car,
2 is various in-vehicle electronic control devices, 3 is in-vehicle electronic control device 2
A power source for driving the vehicle, that is, a battery, 4 is an automobile 1
Is a vehicle speed sensor that detects a traveling speed (hereinafter, referred to as vehicle speed) V of the vehicle speed and inputs the vehicle speed to the vehicle-mounted electronic control device 2. The vehicle-mounted electronic control device 2, the battery 3, and the vehicle speed sensor 4 are mounted on the automobile 1.

Reference numeral 5 denotes an automobile 1 and a failure diagnosis device (described later).
Harness for connecting to and, 6 is a diagnostic connector provided at one end of the harness 5 on the automobile 1 side, and 7 is a manual switch provided at the center of the harness 5 for opening and closing the power output of the battery 3. . Diagnostic connector 6
Is connected to one end of the automobile 1 and is connected to the output terminals of the vehicle-mounted electronic control unit 2 and the battery 3 in the automobile 1.

Reference numeral 8 denotes a failure diagnosis device connected to the automobile 1 via a harness 5, and a peripheral IC 9 including a display unit and a storage unit, and a CPU 1 for controlling the entire failure diagnosis device 8.
1 and. The peripheral IC 9 and the CPU 11 are driven by the power supply voltage of the battery 3 applied via the harness 5, and the peripheral IC 9 and the CPU 11 are connected and related to each other.

Next, the operation of the conventional vehicle failure diagnosis device shown in FIG. 2 will be described. When some trouble occurs in the automobile 1, the operator first fits the diagnostic connector 6 into the connector portion of the automobile 1, and then the in-vehicle electronic control device 2 in the automobile 1 and the CPU 11 in the failure diagnosing device 8.
And are connected via the harness 5. As a result, the CPU 11 in the failure diagnosis device 8 investigates the cause of the malfunction while communicating with the vehicle-mounted electronic control device 2. The manual switch 7 is normally turned on and supplies power to the failure diagnosis device 8.

For example, when the automobile 1 is stalled, if the automobile 1 and the failure diagnosis device 8 are connected via the diagnostic connector 6 and the harness 5, C in the failure diagnosis device 8 is connected.
The PU 11 and the peripheral IC 9 are connected to the battery 3 in the automobile 1.
It receives power supply and starts up. Then, the CPU 11
Reads various sensor information, control information, and the like in the vehicle-mounted electronic control device 2 online via the harness 5 to perform a failure diagnosis.

The CPU 11 in the failure diagnosing device 8 has various functions necessary for diagnosing the failure, and not only has a function of monitoring various sensor information and control information of the in-vehicle electronic control device 2, but also a peripheral IC 9 There are display functions and recording functions used. These functions can be selectively used by the operator according to the symptom of the malfunction. Further, the operator turns on / off the manual switch 7 as necessary to turn on / off the power supply to the failure diagnosis device 8.

[0008] In general, the contents of defects of the automobile 1 include those having reproducibility and those rarely occurring. Of these, for the problems that rarely occur, the recording function of the failure diagnosis device 8 is very effective for failure diagnosis. The recording function means is, for example, a flight recorder of an airplane, and records various sensor information and control information of the vehicle-mounted electronic control unit 2.

In such information recording, the failure diagnosis device 8 may be loaded and recorded on the automobile 1 for several weeks depending on the frequency of occurrence of malfunctions. Since the power supply to the CPU 11 cannot be turned off in order to record various information during the vehicle-mounted period of the failure diagnosis device 8, the manual switch 7 is normally kept on. Therefore, the peripheral IC 9 and the CPU 11 in the failure diagnosis device 8 are always supplied with power,
The battery 3 may be raised.

On the other hand, in order to prevent the battery 3 from rising due to power supply to the failure diagnosis device 8 when the vehicle is stopped, the diagnosis connector 8 is removed by removing the diagnostic connector 6 (or turning off the manual switch 7). It is necessary to stop the power supply to the. However, in this case, when the engine is started (started), in order to restart the failure diagnosis device 8, it is necessary to re-engage the diagnostic connector 6 (or turn on the manual switch 7). , It will be troublesome.

[0011]

As described above, in the conventional vehicle failure diagnosis device 8, the battery 3 in the vehicle 1 is directly connected to the failure diagnosis diagnostic connector 6, and the failure diagnosis device 8 is also provided. Since the peripheral IC 9 and the CPU 11 are directly connected to the harness 5, there is a problem that when the failure diagnosis device 8 is mounted on the automobile 1 for a long period of time, the battery 3 rises when the engine is stopped (getting off). .

Further, in order to prevent such a rise of the battery 3, when the diagnostic connector 6 is removed or the manual switch 7 is turned off when the vehicle is stopped, the fault diagnosis device 8 is restarted when the engine is started again. However, there is a problem that it takes time and effort to fit the diagnostic connector 6 or turn on the switch 7.

The present invention has been made to solve the above problems, and eliminates the occurrence of battery exhaustion even when a failure diagnosis device is mounted for a long period of time, and does not require much labor to mount on-vehicle electronic equipment. An object of the present invention is to obtain an automobile failure diagnosis device capable of surely recording various information of a control device.

[0014]

A vehicle failure diagnosis apparatus according to the present invention includes a battery mounted on a vehicle, a sensor means for detecting a running state of the vehicle, and a power supply from the battery and a sensor means. A failure diagnosis device that takes in a detection signal is provided, and the failure diagnosis device determines a running state or a stopped state of the vehicle based on the detection signal, and a peripheral IC for recording various information of the vehicle.
And a power supply control means for limiting the power supply to the peripheral IC when the stop state of the vehicle is determined.

[0015]

According to the present invention, when the stop state is judged based on the detection signal from the vehicle-mounted sensor means such as the vehicle speed sensor, the power supply to the peripheral ICs is turned off to limit the power supply, and based on the sensor detection signal. When the traveling state is determined by the above, the power supply to the peripheral IC is started and the information recording is started. This will automatically start and stop the recording of information such as various sensor information that is essential for failure diagnosis.
By limiting the unnecessary power supply when the engine is stopped, battery exhaustion is prevented.

[0016]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of a first embodiment of the present invention, in which 2 to 4 and 9 are the same as those described above. Also, 1A, 5A, 6A, 8A and 11
A corresponds to the vehicle 1, the harness 5, the diagnostic connector 6, the failure diagnosis device 8 and the CPU 11, respectively.

In this case, the diagnostic connector 6A is also connected to the output terminal of the vehicle speed sensor 4 in the automobile 1A, and the harness 5A also transfers the vehicle speed V to the CPU 11A in the failure diagnosis device 8A. There is. Further, the harness 5A is not provided with the manual switch 7 (see FIG. 2).

Reference numeral 10 denotes a transistor which is provided in the failure diagnosing device 8A and serves as a power supply control means for the peripheral IC 9, which is inserted between the harness 5A and the peripheral IC 9. The transistor 10 is controlled to be opened / closed by a control signal C from the CPU 11A. Also, CP
The U 11A is adapted to turn off the transistor 10 by the control signal C when the vehicle stop state is determined based on the vehicle speed V, for example.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described. As described above, the indispensable information (various sensor information and control information in the in-vehicle electronic control unit 2) for performing the failure diagnosis of the automobile 1A is transferred to the in-vehicle fault diagnosis device 8A. Is unnecessary when the engine is stopped (getting off), and the battery 3
It will cause a rise in the heat.

Therefore, the CPU in the failure diagnosis device 8A
Focusing on the fact that various information when the vehicle is stopped is unnecessary, 11A takes in the vehicle speed V from the vehicle speed sensor 4 through the harness 5A, and when the stopped state is determined based on the vehicle speed V (= 0), The power supply to IC9 is stopped. For example, control signal C applied to the base of transistor 10
Is set to the L level to turn off the transistor 10 and cut off the power supply path to the peripheral IC 9.

On the other hand, when the automobile 1A starts traveling, C
The PU 11A starts supplying power to the peripheral IC 9. First, when the vehicle speed V (> 0) indicating the traveling state is transferred from the vehicle speed sensor 4 to the CPU 11A in the failure diagnosis device 8 via the harness 5, the CPU 11A detects the traveling state based on the vehicle speed V and controls the vehicle. By setting the signal C to the H level, the transistor 10 is turned on and power is supplied to the peripheral IC 9. After that, various sensor information and control information in the on-vehicle electronic control unit 2 are read from the harness 5A and recording of various information is started.

After that, when the engine stop is recognized based on the vehicle speed V from the vehicle speed sensor 4, the CPU 11A stops recording various information, controls the transistor 10 to be off, and supplies power to the peripheral IC 9. Stop. Less than,
The same operation is repeated, and only necessary information for traveling is continuously recorded.

As described above, the CPU in the failure diagnosis device 8A
11A takes in the vehicle speed V from the vehicle speed sensor 4 in the automobile 1A, and controls on / off the power supply to the peripheral IC 9 in the failure diagnosis device 8A. That is, when the stop state is determined, the power supply to the peripheral IC 9 is turned off to limit the power supply location in the failure diagnosis device 8A, and when the running state is determined, the power supply to the peripheral IC 9 is turned on. It records various sensor information that is essential for failure diagnosis. As a result, information recording can be automatically started and stopped, and unnecessary power supply when the engine is stopped (getting off) can be limited to prevent the battery 3 from rising.

Example 2. Although the vehicle speed sensor 4 is used to recognize the running state and the stopped state of the automobile 1A in the first embodiment, the IG indicating the on / off state of the start key is used.
An (ignition) key signal may be used. Although the transistor 10 is used as the power supply control means for the peripheral IC 9, a relay or another switch may be used.

[0025]

As described above, according to the present invention, the battery mounted on the automobile, the sensor means for detecting the running state of the automobile, and the failure for receiving the detection signal from the sensor means while being supplied with power from the battery The failure diagnosing device includes a CPU for determining a running state or a stopped state of the vehicle based on the detection signal, a peripheral IC for recording various information of the vehicle, and a stopped state of the vehicle. And a power supply control means for restricting power supply to the peripheral IC at times. When the stop determination is made, the power supply to the peripheral IC is turned off to limit the power supply, and at the time of traveling determination, the power supply to the peripheral IC is started. And start recording information,
It automatically starts and stops the recording of information such as various sensor information that is indispensable for failure diagnosis, and limits the unnecessary power supply at the time of stop to prevent the battery from charging up, so Even when the failure diagnosis device is mounted, there is an effect that a failure diagnosis device for an automobile can be obtained in which the occurrence of battery exhaustion is eliminated and various information of the vehicle-mounted electronic control device can be surely recorded without trouble.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a conventional vehicle failure diagnosis device.

[Explanation of symbols]

 1A automobile 3 battery 4 vehicle speed sensor 8A failure diagnosis device 9 peripheral IC 10 transistor (power supply control means) 11A CPU V vehicle speed (detection signal)

Claims (1)

[Claims] 1. A battery mounted on an automobile, a sensor unit for detecting a traveling state of the automobile, and a failure diagnostic device which is supplied with power from the battery and takes in a detection signal from the sensor unit. The failure diagnosis device determines a running state or a stopped state of the vehicle based on the detection signal, a peripheral IC for recording various information of the vehicle, and a stop state of the vehicle when the stopped state of the vehicle is determined. The peripheral IC
And a power supply control means for restricting power supply to the vehicle.