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Controller diagnosis signal generation, fault protection and function safety method and system

A controller and signal technology, applied in the field of control, can solve the problems of lack of versatility, inability to find out in time, time-consuming and other problems, and achieve the effect of easy detection and high reliability

Active Publication Date: 2018-01-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this fault protection method takes a long time, and it cannot detect the fault in time and deal with it in time to avoid harm.
and not universal

Method used

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  • Controller diagnosis signal generation, fault protection and function safety method and system
  • Controller diagnosis signal generation, fault protection and function safety method and system
  • Controller diagnosis signal generation, fault protection and function safety method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] This embodiment provides a method for generating a controller diagnostic signal. The controller in this embodiment may be a controller in a control system configured with a single controller, or a redundant controller in a redundant control system ( The controllers in the redundant control system are called redundant controllers).

[0144] Such as figure 1 As shown, the method of this embodiment includes:

[0145] Step 110, the controller executes the diagnostic logic while executing the control task, and generates a predetermined diagnostic signal;

[0146] In this embodiment, the diagnostic logic includes digital signal inversion logic, and the predetermined diagnostic signal is a pulse train signal. Optionally, the duty ratio of the pulse train signal is 1, and the pulse width is equal to the control cycle of the controller. This kind of diagnostic signal is convenient for the controller to generate, and when the controller fails to perform the control task, the d...

Embodiment 2

[0169] This embodiment provides a controller failure protection method. Similar to Embodiment 1, the controller in this embodiment may be a controller in a control system configured with a single controller, or a redundant controller in a redundant control system.

[0170] Such as image 3 As shown, the method of this embodiment includes:

[0171] Step 210, the controller executes the diagnostic logic while executing the control task, generates and outputs a predetermined diagnostic signal;

[0172] In this embodiment, the predetermined diagnostic signal is a pulse train signal, the duration of the high level of the pulse train signal is T1, and the duration of the low level is T2; optionally, the duty of the pulse train signal The ratio is 1, T1=T2=T, and T is the control cycle of the controller.

[0173] In this embodiment, the diagnostic signal output by the controller includes a first pulse train signal and a second pulse train signal with opposite phases; or, the diagn...

Embodiment 3

[0217] This embodiment provides a fault protection device for diagnosing a diagnostic signal that is normally a pulse train signal. Its function is consistent with that of the fault protection device in Embodiment 1, but this embodiment mainly describes its own structure, as Figure 5 As shown, the fault protection device includes:

[0218] The first detection circuit 401 includes a first switch unit connected in series and a first delay action unit, and the first delay action unit is configured when the turn-on time of the first switch unit reaches a preset first delay time action;

[0219] The second detection circuit 402 includes a second switch unit connected in series and a second delay action unit, and the second delay action unit acts when the turn-on time of the second switch unit reaches a preset second delay time ;

[0220] The signal generation circuit 403 generates a failsafe signal when detecting that any one of the first delay action unit and the second delay a...

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Abstract

The invention discloses a controller diagnosis signal generation, fault protection and function safety method and system. The controller performs a diagnosis logic while performing a control task, andpulse train signals are generated and used as diagnosis signals to be outputted; a fault protection device detects the diagnosis signals outputted by the controller, if the diagnosis signals outputted by the controller are determined to be non-pulse train signals, fault protection signals are generated. A safety protection circuit for controlling and protecting an object by the controller performs a protection action according to the fault protection signals to realize function safety of the object. Function safety of the controller can be realized, the method and the system are simple, universal and low in cost.

Description

technical field [0001] The present invention relates to control technology, more specifically, to methods for generating controller diagnostic signals, fault protection and functional safety, as well as corresponding devices and systems. Background technique [0002] The situation that safety depends on system functions is called "functional safety". While undertaking the process monitoring task, the safety-related system also undertakes the task of safety production risk control. Functional safety prevents the failure of safety-related systems or equipment. resulting in danger. [0003] Functional safety controllers are a type of specialized controllers that apply risk control systems and methods to design software and hardware. They have high technical requirements, fewer products, and are expensive. At present, there are still quite a few industrial applications, including power plants, due to the need for centralized monitoring and easy maintenance, more safety-related ...

Claims

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Application Information

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IPC IPC(8): G05B23/02
Inventor 崔天依牛玉广牛海明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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