Sensor fault diagnosis device and method and signal acquisition system of sensors

Abstract

The invention discloses a fault diagnosis device and method of sensor acquisition modules and a signal acquisition system of sensors. The sensor fault diagnosis device comprises a first sensor acquisition module, a second sensor acquisition module and a difference value comparing module, wherein the first sensor acquisition module is used for acquiring and outputting a first parameter signal through a first sensor, the second sensor acquisition module is used for acquiring and outputting a second parameter signal through a second sensor, the difference value comparing module is used for calculating the absolute value of the difference between the first parameter signal and the second parameter signal, and comparing the absolute value of the difference with a preset threshold value, and when the absolute value of the difference is larger than the preset threshold value, at least one of the first sensor acquisition module and the second sensor acquisition module is judged to break down. When the values of the signals acquired by the sensors largely deviate from an actual value but are in the acquired effective measurement range, the sensor fault diagnosis device and method can accurately judge whether the sensor acquisition modules break down, and improves the accuracy of fault diagnosis.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a sensor fault diagnosis device and method and a sensor signal acquisition system. Background technique [0002] Signals such as speed, temperature, and pressure are important parameters required by the control system for state control and protection, and these signals are collected through sensors. In the field of aero-engine control, signals such as speed, temperature, and pressure are important parameters for aero-engine control, which can ensure the safe operation of the engine. Therefore, it is particularly important to judge whether the sensor is working normally. [0003] The current sensor fault diagnosis system can only judge whether there is a loop fault in the sensor acquisition system (such as sensor open circuit, short circuit, short circuit with ground, etc.) and whether the value and change rate of the collected signal are within the valid range. , pressure and other sensor...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a sensor fault diagnosis device and method and a signal acquisition system of the sensor, so as to solve the problem that when other faults occur in the sensor acquisition system, the acquired value deviates greatly from the actual value but is within the effective measurement range of the acquisition. If the technical judgment cannot be wrong, the collected signal is still considered to be valid and accurate.

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