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Fault safety type current output channel diagnosis system and method

An output channel, fail-safe technology, applied in the field of electronics, which can solve the problems of easy access to danger and low diagnostic coverage.

Pending Publication Date: 2020-02-14
CHINA SOUTH IND GRP AUTOMATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing systems and methods for diagnosing the current output channel system not only have low diagnostic coverage, but also tend to enter a dangerous state when a fault occurs, and the purpose is to provide a fail-safe current output channel diagnostic system The method thereof solves the problem of diagnosing the current output channel

Method used

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  • Fault safety type current output channel diagnosis system and method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] Such as figure 1 As shown, a fail-safe current output channel diagnosis system and method thereof of the present invention include an output control module, a DA module, a load, a sampling circuit, an AD module, and a diagnosis and comparison module connected in sequence, and the diagnosis and comparison module is connected to the output control module ;

[0029] The DA module and the load are connected to both ends of the switch module, and the switch module is also connected to the diagnosis comparison module;

[0030] The output control module is used to control the output current of the DA module;

[0031] The diagnosis comparison module is used for controlling the switch module and diagnosing the state of the output current, and sending the diagnosis result to the output control module.

[0032] The diagnosis comparison module also includes a WatchDog module, and the WatchDog module is used to monitor the running state of the output control module.

Embodiment 2

[0034] A fail-safe current output channel diagnosis method, the diagnosis method comprising the following steps:

[0035] (1) The output control module controls the output current of the DA module, and the diagnostic signal enters the diagnostic comparison module through the AD module and is compared with the output value of the output control module. When a fault occurs, the diagnostic comparison module controls the switch module to disconnect;

[0036] (2) While the switch module is disconnected, the diagnosis comparison module transmits the diagnosis data to the output control module, and the output control module controls the DA module to turn off the output;

[0037] (3) The WatchDog module in the diagnosis comparison module monitors the operating state of the output control module;

[0038] (4) The order of the dog feeding signals received by the WatchDog module is the same as the preset, and the time interval between each watchdog receiving the dog signal does not excee...

Embodiment 3

[0040] On the basis of Embodiment 2, when the system is powered on, the system is in maintenance status, and the system is regularly tested, a wandering bit method is used to diagnose the current output channel. The specific operation is that the output control module will be controlled according to the method shown in Table 1. DA module output (take 10-bit SAR type DA as an example).

[0041] Table 1

[0042]

[0043]

[0044] When the system is working normally, in order not to affect the normal output, it is no longer necessary to carry out the diagnosis by walking position method, but to compare the AD recovery value of the diagnosis comparison module with the output value of the current output control module.

[0045] If the comparison results are inconsistent, the diagnosis and comparison module turns off the switch, and at the same time feeds back the diagnosis result to the output control module. The output control module controls the DA to turn off the output op...

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Abstract

The invention discloses a fault safety type current output channel diagnosis system and method. The system comprises an output control module, a DA module, a load, a sampling circuit, an AD module, adiagnosis comparison module which are connected in order, and the diagnosis comparison module is connected with the output control module; the DA module and the load are connected with two ends of theswitch module, and the switch module is also connected with the diagnosis comparison module; the output control module is used for controlling the DA module to output a current; and the diagnosis comparison module is used for controlling the switch module, diagnosing the current state and sending a diagnosis result to the output control module. According to the invention, it can be effectively guaranteed that when any module or assembly in the channel goes wrong, the fault guiding safety effect can be achieved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a fail-safe current output channel diagnosis system and a method thereof. Background technique [0002] When the existing fail-safe current output channel diagnosis system is working normally, the output control module controls the DA output current, and the diagnostic signal enters the diagnosis comparison module through AD recovery, and compares it with the output value of the output control module to complete the channel diagnosis. If the difference of the comparison result exceeds the allowable range △, it means that there is an abnormality in the output channel. At this time, the diagnosis and comparison module will feed back the result to the output control module, and the output control module will control the DA to disconnect the output to achieve the purpose of failure safety. [0003] However, it is impossible to diagnose all DC-type faults only by comparing the rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02G01R19/25
CPCG05B23/0213G01R19/25G05B2219/24065
Inventor 李彦平魏亚鹏谭晟吉黄菊蒲永材张雄林邵德立邹佳鑫吴昌昊王文俊
Owner CHINA SOUTH IND GRP AUTOMATION RES INST
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