Method for fault self-detection of aeroengine oil needle linear displacement sensor

Abstract

The invention discloses a fault self-detection method for an oil needle linear displacement sensor of an aero-engine. When a direct current excitation signal of the oil needle linear displacement sensor exceeds an allowable range, an excitation failure is judged to occur; when the excitation signal is faultless, a controller sends the excitation signal into the primary coil side of the linear displacement sensor; first and second groups of direct current feedback signals are obtained through direct processing of first and second groups of feedback signals measured by the secondary coil side ofthe oil needle linear displacement sensor, and when the sensor fails, the output of any group of the direct current feedback signals is 0; and when the feedback signals are faultless, the first and second groups of direct current feedback signals are further processed and then sent into the aero-engine controller to participate in oil needle displacement closed-loop control. According to the fault self-detection method for the oil needle linear displacement sensor of the aero-engine, the feedback fault and excitation fault of the oil needle linear displacement sensor during operation of the aero-engine can be detected, and the controller can stop in time when the oil needle linear displacement sensor fails to ensure operation safety of the aero-engine.

Description

technical field [0001] The invention relates to an oil needle signal conditioning circuit design method that can be used for fault self-detection of an aero-engine oil needle linear displacement sensor, and relates to excitation and feedback signal conditioning of an aero-engine oil needle displacement sensor, and fault self-detection of the oil needle displacement sensor signal . Background technique [0002] like figure 1 As shown, the existing aero-engine oil needle linear displacement sensor converts the displacement of the fuel needle into electricity, which is collected by the aero-engine electronic controller. The controller compares the current fuel supply calculated by the displacement with the given fuel supply. In comparison, the fuel entering the aero-engine is closed-loop adjusted by the electro-hydraulic servo valve, thereby realizing the control of the speed of the aero-engine. When the oil needle linear displacement sensor signal is lost, the controller sho...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing integrated processing circuit cannot judge the fault of the linear displacement sensor during the operation of the aero-engine, and to provide a method for self-detection of the fault of the linear displacement sensor of the aero-engine oil needle, which involves the linear displacement sensor of the aero-engine. Exciting Circuit Design and Feedback Circuit Design of Displacement Sensor

Images