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Load-control backup signal generation circuit

A backup signal and circuit generation technology, applied in the direction of responding to error generation, measuring electricity, measuring electrical variables, etc., can solve the problems of microcomputer out of control, electronic control device out of control, etc., and achieve the effect of preventing failure

Active Publication Date: 2015-08-19
YAZAKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, in the case of being affected by electromagnetic noise entering from the outside, in the case of a malfunction of the microcomputer, in the case of performing an unexpected operation due to the influence of a defect (program error) contained in the program itself, etc., the microcomputer The computer can be out of control
[0004] If the microcomputer is out of control, the entire electronic control device is out of control

Method used

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  • Load-control backup signal generation circuit
  • Load-control backup signal generation circuit
  • Load-control backup signal generation circuit

Examples

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Embodiment Construction

[0040] Hereinafter, specific embodiments regarding the load control standby signal generation circuit according to the embodiment of the present invention will be described with reference to each drawing.

[0041]

[0042] figure 1 A configuration example of a main unit of an electronic control device including the standby signal generating circuit 20 according to the present embodiment is shown.

[0043] figure 1 The electronic control device shown in includes a microcomputer 10 as a main control unit. The microcomputer 10 executes a program stored in advance in, for example, an internal memory (ROM), and thus, can perform control for executing functions required by the electronic control device.

[0044] exist figure 1 In the configuration example shown in , the microcomputer 10 has a function of controlling the power on and off of the load 31 . As specific examples of the load 31, various in-vehicle electrical components can be assumed. Furthermore, the switching dev...

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Abstract

In a case in which a malfunction occurs in a control processor which operates according to a predetermined program, a load-control backup signal generation circuit supplies a backup control signal to a switch of a load connected to an output of the control processor. The load-control backup signal generation circuit includes: a watchdog input terminal to which a watchdog signal periodically output from the control processor is input; a pulse count unit which counts a clock pulse generated with a constant period and which controls a count state of the clock pulse according to a signal input to the watchdog input terminal; and a backup signal output unit which generates the backup control signal when a count output of the pulse count unit satisfies a predetermined condition.

Description

technical field [0001] One or more aspects of the present invention relate to a load control backup signal generating circuit that supplies a backup control signal to a The load switch that controls the output of the processor. Background technique [0002] For example, a microprocessor for control, that is, a microcomputer (control processing unit) (CPU) that operates according to a predetermined program is embedded in various electronic control units (ECUs) installed in vehicles. [0003] A microcomputer usually executes various controls as scheduled based on the contents of a program prepared in advance. However, for example, in the case of being affected by electromagnetic noise entering from the outside, in the case of a malfunction of the microcomputer, in the case of performing an unexpected operation due to the influence of a defect (program error) contained in the program itself, etc., the microcomputer Computers can be out of control. [0004] If the microcomput...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/07
CPCG06F11/0757G06F11/0772G01R31/00G06F11/0739G06F11/1604
Inventor 渡和久
Owner YAZAKI CORP
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