JP2004158031A - Method for diagnosing fault of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle fault diagnosing method capable of displaying a fault of each control unit and switching the display of the fault to detailed fault information and capable of improving the efficiency of repairing work. <P>SOLUTION: When a fault occurs in a control device loaded in the vehicle, a warning display corresponding to the fault and a fault code signal corresponding to detailed fault information are displayed on a multiple display device so as to be switched by a display switching means 2, the multiple display means is constituted so as to be controlled by multiple display control devices (18, 19) and the display of the warning display is switched to the fault code signal corresponding to the detailed fault information by the switching operation of the display switching means 2. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a vehicle failure diagnosis method using a multiple display control device.

  2. Description of the Related Art Conventionally, there have been known various types of failure diagnosis apparatuses for vehicles which are equipped with a computer-controlled self-diagnosis apparatus, that is, a diagnosis apparatus, which detects an abnormality in an engine, a transmission, a brake or the like. The device shown in FIG. 4 is one of them.

  In this technology, a plurality of sensors (not shown) are arranged in the engine control unit 15, the mission control unit 16, and the brake control unit 17, respectively. When the sensors detect an abnormality, a warning lamp is output from a unit connected to the sensors. A warning signal for turning on and off is transmitted, and the display portion corresponding to the control unit of the multiplex display means 51 blinks via the multi-warning control circuit 58, whereby the control device of the vehicle related to any unit is abnormal. Is displayed.

  Then, to determine which part of the control device has a failure, the vehicle is brought to a maintenance shop, and a code is displayed on the failure diagnosis tester 11 via the communication lines 13 and 14. When the failure diagnosis tester 11 is not provided, the diagnostic switches 52, 53, 54, etc., connected to the respective control units, are operated by a manual operation of a maintenance worker or a user, and the type of the failure is determined. For example, a corresponding Morse code (..-.-, ..- ..) is output from the control unit, and the Morse code is read by a multi-warning control circuit 58, and then converted into a numerical display to be multiplexed display means 51. Is displayed. In order to repair the failure of each control device and clear the storage of the failure information of each control unit, the clear switches 55, 56, 57 and the like are opened and closed by manual operation as in the case of the display. I have.

JP-A-8-230609

  Therefore, in this technology, using a failure diagnosis tester in a repair shop to sequentially operate the diagnostic switch, or, if there is no failure diagnostic tester, searching for the diagnostic switch and manually opening and closing it, The operation is complicated and time-consuming, and it takes time and effort to generate a Morse code signal that is a blinking signal and read the pattern of the Morse code.

  In view of the above circumstances, an object of the present invention is to provide a vehicle failure diagnosis method capable of displaying a failure state of each control unit with a simple operation.

The present invention solves this problem, a plurality of control units including a plurality of sensors mounted on the vehicle,
Display means capable of multiplex display of the failure states of the plurality of control units;
Display switching means for switching the display content of the display means disposed in the vehicle interior,
In the method for diagnosing a vehicle failure using a multiple display control device that captures signals from the plurality of control units and display switching means and controls display contents on the display means,
When a failure occurs in any of the plurality of control units, a signal output step of specifying the failure location and outputting a failure signal to the display control device,
A first failure display step of causing the display control device to perform a failure display indicating the failure location on the display means in response to a failure signal of the control unit;
A second failure display step of performing a failure display indicating more detailed failure information among the failure locations by a switching operation of the display switching means,
Preferably, a failure signal erasing step of erasing the failure content stored in the control device by re-operating the display switching means is provided.

More specifically, the multiple display control device includes a CPU and a multiple display drive circuit, and when a failure occurs in any of the plurality of control units in the multiple display control device, the failure location is determined. According to the specified failure signal, an on / off signal of a pattern corresponding to the failure location is transmitted to the multiplex display drive circuit via the CPU, and a warning display corresponding to the failure location is displayed on a monitor including multiplex display means. 1 failure display step;
A second failure display step of operating a display changeover switch of the vehicle to display a failure code indicating a detailed failure content of the failure location on a monitor via the display control device;
By repairing the fault location based on the fault code and re-operating the display changeover switch, a clear signal is transmitted to the corresponding control unit via the display control device to clear the warning display and the fault code. It is characterized by comprising a failure signal erasing step.

In this invention, the following configuration is preferable.
The multiplex display control device is configured to output an erasure signal for erasing the fault content stored in the control unit by operating the display switching means.
Further, the erasing signal is configured to be output to the control unit via the display control device.
According to this invention, when an abnormality occurs, the failure location of the target device can be displayed, and detailed failure information of the failure location by a serial signal can be immediately displayed on the multiplex display device by operating the switch of the display switching unit. Thus, detailed failure information can be quickly grasped, so that repair work can be performed efficiently.

  As described above, according to the present invention, it is possible to display a failure location for each control unit and to switch and display the failure location to detailed failure information with a simple operation, thereby improving the efficiency of repair work.

  Hereinafter, preferred embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Not just.

  FIG. 1 is a block diagram showing the arrangement of a diagnostic monitor and a mode select switch of a vehicle failure diagnosis device according to an embodiment of the present invention. FIG. 2 is a block diagram of the failure diagnosis device. 3 is a flowchart of the apparatus. In FIG. 1, a diagnostic monitor 1 as a multiplex display device is disposed in a meter cluster, and an operation switch 2 as a display switching means is disposed near the right hand thereof.

  The switch 2 has a mode select switch operation unit 2a at the upper stage and a set / reset switch operation unit 2b at the lower stage. Specifically, the set / reset switch operation unit 2b functions as a display switching unit. The upper mode select switch operation unit 2a is a switch that is operated, for example, when it is desired to display the current traveling fuel consumption, traveling distance, and the like on the diagnostic monitor 1. Since the mode selection switch operation unit 2a does not directly relate to the present invention, description thereof is omitted. I do.

  When a failure occurs in a sensor of an engine control unit or a mission control unit, which will be described later, the diagnostic monitor 1 uses a warning signal to display the character of the failed part displayed as “engine control” or “T / M control” as shown in FIG. It lights up, and where the engine or the mission is in failure is visually recognized by the operation of the set / reset switch operation unit 2b by displaying “01” or “10” as shown on the display units 1b and 1c. . Note that, in the present embodiment, the display by numbers has been described as an example, but the display may be characters.

  2, in the failure diagnosis device 10, a plurality of sensors (not shown) are arranged in the engine control unit 15, the mission control unit 16, and the brake control unit 17, respectively. Output terminals 15a, 16a, 17a of the respective control units 15, 16, 17 are connected to input terminals 19a, 19b, 19c of the CPU 19, respectively.

  The multiplex display driving circuit 18 is connected to a CPU (Central Processing Unit) 19 and connected to the diagnostic monitor 1, and is switched under the control of the CPU 19 at a time interval corresponding to a failure content from each control unit. A code indicating the failure content (failure information) corresponding to the ON-OFF signal, which will be described later, in accordance with the ON-OFF signal described later, in response to the ON-OFF signal, a warning signal of an electric signal which is an electric signal. A number or a character is displayed on the display unit of the diagnostic monitor 1 from the signal.

  The CPU 19 is connected to the set / reset switch 2b, and when the set / reset switch 2b is not operated, the CPU 19 sends a signal to the multiplex display drive circuit 18 to keep the warning display enabled state.

  The output terminal 20a of the serial communication interface 20 is connected to the line 14 to which the input terminals 15c, 16c, 17c of the control units 15, 16, 17 are connected, and the input terminal 20b is the output terminal of each control unit 15, 16, 17, 15b, 16b, and 17b are connected to the line 13 to which they are connected.

  The serial communication interface 20 is connected to the CPU 19, and a command signal is issued from the CPU 19 by operating the set / reset switch 2b. The command signal is transmitted to the control unit via the serial communication interface 20 via the line 14. A code signal indicating the content of the fault corresponding to the warning signal is configured to be available to the CPU 19 via the line 13, and the memory indicating the content of the fault in the control unit is stored by operating the set / reset switch 2b again. It is configured to be cleared.

  The connector 12 connected to the lines 13 and 14 is arranged at a position (not shown) in the cab. The failure diagnosis tester 11 disposed in the repair shop includes a display device, a mode switch, and the like (not shown). The failure diagnosis tester 11 is connected to the connector 12, and the failure diagnosis tester 11 is connected to the control unit by the line 14 from the failure diagnosis tester 11. The transmitted code signal indicating the content of the fault corresponding to the warning signal is configured to be available via the line 13, and the memory indicating the content of the fault in the control unit is configured to be cleared.

  Next, the operation of the present embodiment will be described with reference to the flowchart of FIG. If the sensor (not shown) connected to the engine control unit 15 shown in FIG. 2 fails while the set / reset switch 2b shown in FIG. 1 is in the non-operation state, a failure signal comes into the engine control unit 15 (30). In the engine control unit 15, a failure location and detailed failure information are specified according to the type of the sensor, and an ON-OFF signal of a pattern corresponding to the failure location is transmitted to the multiplex display driving circuit 18. Then, "engine control" is displayed on the diagnostic monitor 1 of FIG. 1 and the character is turned on (31).

  When the vehicle is stored in the maintenance shop (32) and the set / reset switch 2b is operated, a failure code indicating the detailed failure content of the failure location can be called out by numeral (33). The failure code is displayed on the diagnostic monitor 1 (34).

  The fault location is repaired, its surroundings are inspected (35), and the set / reset switch 2b is operated again to transmit a diagnostic clear signal to the input terminal 15c of the engine control unit 15 to clear it (36).

  In this state, it is confirmed that the warning display or the failure code does not occur again (37), and the process is terminated. Even when the failure is not related to the engine but related to the mission or the brake, the operation is performed in the same steps as described above.

  Further, in the above-described embodiment, the failure code can be displayed by simply operating the set / reset switch 2b. However, the switch for displaying the code can be displayed only by the maintenance worker of the maintenance shop. The operation method may be complicated so that it cannot be displayed to the user. In this case, it is possible to prevent the user from being easily repaired by the user's failure judgment, and to prompt the repair by a specialized maintenance worker, so that the safety after the repair can be guaranteed.

  As described in detail above, in this embodiment, the display code as the failure code can be quickly obtained by operating the set / reset switch without reading the blinking pattern of the warning signal corresponding to the failure content. Can be displayed easily, and the efficiency of repair work is improved without the need for a dedicated failure diagnosis tester.

  It is possible to provide a failure diagnosis method for a vehicle that can display the failure state of each control unit with a simple operation. In particular, the failure location of each control unit can be displayed with a simple operation and the failure location can be switched to detailed failure information. And the efficiency of repair work can be improved.

1 is a configuration diagram illustrating an arrangement configuration of a diagnostic monitor and an operation switch of a failure diagnosis device for a vehicle according to an embodiment of the present invention. It is a block configuration diagram of a failure diagnosis device. It is a flowchart of a failure diagnosis apparatus. FIG. 2 is a diagram showing a vehicle failure diagnosis device according to a conventional example.

Explanation of reference numerals

1 Diag monitor (multiplex display device)
2b Set / reset switch (display switching means)
18 Multiple display drive circuit 19 CPU

Claims (2)

A plurality of control units including a plurality of sensors mounted on the vehicle,
Display means capable of multiplex display of the failure states of the plurality of control units;
Display switching means for switching the display content of the display means disposed in the vehicle interior,
In the method for diagnosing a vehicle failure using a multiple display control device that captures signals from the plurality of control units and display switching means and controls display contents on the display means,
When a failure has occurred in any of the plurality of control units, a signal output step of identifying the failure location and outputting a failure signal to the display control device,
A first failure display step in which the display control device causes the display unit to perform a display indicating the failure location in response to a failure signal of the control unit;
A second failure display step of displaying detailed failure information on the failure location by a switching operation of the display switching means. The fault diagnosis method according to claim 1,
A failure diagnosis method comprising a failure signal erasing step of erasing a failure location and failure content of failure information stored in the control device by re-operating the display switching means.

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