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Electronic control device

An electronic control device and circuit technology, applied in computer security devices, transportation and packaging, circuits or fluid pipelines, etc., can solve problems such as undetectable computer out-of-control, difficulty in ensuring system reliability, etc.

Pending Publication Date: 2021-11-26
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the watchdog timer circuit fails, it is impossible to detect the runaway of the computer, so it is difficult to ensure the reliability of the system

Method used

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  • Electronic control device
  • Electronic control device
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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] Next, the electronic control device of the first embodiment of the present invention will be described.

[0028] figure 1 A block diagram showing the configuration of a vehicle integral system 1 including the electronic control device of the first embodiment. In the present embodiment, the electronic control device is configured to be mounted in the ECU (Electronic Control Unit), for example, ECU 10.

[0029] figure 1 The displayed vehicle integral system 1 includes the ECU 10, other ECUs 11, 12, 13, and a warning light 30.

[0030] The ignition switch IGN is connected to the ECU 10, and the ECU 10 can get the state of the ignition switch. Further, the ECU 10 is connected to the ECU 11, 12, 13 to send and receive information between the ECU 11, 12, 13 via the in-vehicle LAN 20 (in-vehicle communication network) as the communication network.

[0031] The warning light 30 is connected to the ECU 11, and the ECU 10 can be controlled via the ECU 11 to control the actions of t...

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PUM

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Abstract

Provided is an electronic control device that can perform fault diagnosis on a watchdog circuit without delaying the start of the normal processes of a computer. A microcomputer termination processing unit 200 stops the output of a pulse to a watchdog timer circuit 101 in response to the implementation of a termination process of a microcomputer 100. A watchdog timer circuit fault diagnosis unit 201 writes anomaly information, which indicates that an anomaly has occurred in the watchdog timer circuit 101, to non-volatile memory 102 if a reset signal is not output from the watchdog timer circuit 101 even after a prescribed amount of time has passed after the output of the pulse being stopped.

Description

Technical field [0001] The present invention relates to an electronic control device, and more particularly to an electronic control device including a watchdog timer circuit that monitors a computer. Background technique [0002] It is well known that the so-called watchdog timer circuit is a hardware circuit for monitoring the state of the computer. By receiving the pulse from the monitoring object computer to be transmitted from the monitoring target, the timeout is detected in the predetermined time without receiving a pulse, it is determined that the computer has an abnormality. If the watchdog timer circuit is faulty, it is impossible to detect the failure of the computer, so it is difficult to ensure the reliability of the system. [0003] The following Patent Document 1 will be disclosed as follows: After the supply is just powered, the microcomputer generates the program out of control, and it is determined whether or not the supply of reset signals from the watchdog tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/12
CPCG06F21/123B60R16/02G06F11/36G06F11/0757G06F11/0739G06F11/0772G06F11/0751G06F11/1004G06F11/079
Inventor 全其贤
Owner HITACHI ASTEMO LTD