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Vehicle trouble diagnosis system

A technology for diagnosing system and automobile faults, which is applied to vehicle parts, instruments, electrical digital data processing, etc., and can solve problems such as discomfort

Inactive Publication Date: 2004-11-24
BOSCH AUTOMOTIVE SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this can make the driver uncomfortable when the ignition is switched on, it is a problem

Method used

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  • Vehicle trouble diagnosis system
  • Vehicle trouble diagnosis system
  • Vehicle trouble diagnosis system

Examples

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Embodiment Construction

[0014] An embodiment of the present invention will now be explained with reference to the drawings.

[0015] FIG. 1 is a circuit diagram showing an automobile breakdown diagnosis system as an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a control microcomputer for operating an unshown internal combustion engine system of an automobile, and numeral 2 denotes another microcomputer serving as a monitoring means for monitoring the control operation of the microcomputer 1. In this illustrated configuration, the microcomputers 1 and 2 monitor each other's operations. Although in this embodiment the microcomputer 1 is used to control the internal combustion engine of the vehicle in operation, the present invention is not limited to this scheme, and thus also includes the use of the microcomputer 1 to operate various types of equipment such as fuel injection systems. control.

[0016] The operation of the microcomputer 2 for monitoring the microcompute...

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PUM

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Abstract

A vehicle trouble diagnosis system adapted to actuate a lamp (5) to give a trouble diagnosis indication in response to a CPU runaway detection signal (WDA) outputted from a microcomputer (2) for watching whether or not a control microcomputer (1) is running away, and adapted to intentionally output the CPU runaway detection signal (WDA) before execution of control by the microcomputer (1) for trouble diagnosis is started, wherein a transistor (4A) is kept turned-on until lighting is started for checking the lamp (5) after an ignition switch has been switched from off to on, so that the lamp (5) is in a continuously lighted state, thus preventing the lamp (5) from flickering during checkup.

Description

technical field [0001] The present invention relates to an automobile fault diagnosis system for diagnosing faults of a computer for controlling an internal combustion engine and other automobile systems and displaying fault diagnosis results. Background technique [0002] Automobiles utilizing a microcomputer to control the operation of the internal combustion engine as well as other vehicle systems are generally equipped with a vehicle diagnostic system for performing proper timing diagnostics on the microcomputer for operational failures. When the fault diagnosis system finds a malfunction such as a CPU hang up, it notifies the driver of the diagnosis result through an activation lamp or other prescribed display members. [0003] Some common fault diagnosis systems of this type are equipped with a monitoring device separate from the control microcomputer to be diagnosed, for monitoring the operation of the control microcomputer. When the control microcomputer appears to ...

Claims

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Application Information

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IPC IPC(8): B60R16/02B60K35/00B60R16/023F02D45/00
CPCG06F11/325B60R16/0232G06F11/00
Inventor 松崎秀昭渡边恭成佐藤荣一川野智行
Owner BOSCH AUTOMOTIVE SYST CORP