Turbojet engine pressure measurement and diagnosis method and device

Abstract

The invention discloses a turbojet engine pressure measurement and diagnosis method and device. A pressure sensor is used for collecting pressure, the pressure is converted into a voltage signal, a processor controls a self-checking signal generating circuit to generate a self-checking signal, the self-checking signal and the pressure signal are transmitted to the analog switch for channel selection, and a selected signal is converted by a signal measurement circuit and transmitted to the processor. Working characteristics of a turbojet engine are utilized; when the collected pressure changesabnormally and does not accord with the state collection quantity, it can be preliminarily determined that pressure signal measurement may have a fault, self-checking is carried out then to diagnose the fault, high reliability of pressure measurement is ensured, rapid and real-time control of the engine is ensured, and pressure signal measurement is diagnosed. Excessive redundancy design is avoided, the problem of increasing the complexity of the system is avoided, and by means of channel selection of the analog switch, multiple pressure signals are measured, and a detection point with abnormal pressure can be diagnosed and located.

Description

technical field [0001] The invention belongs to the field of engine control, in particular to the technical field of pressure measurement and fault diagnosis of a turbojet engine. Background technique [0002] As a kind of aeroengine, the turbojet engine is the power source of the aircraft, and is mainly used to provide the thrust required for the flight of the aircraft. The function of the engine control system is to collect and monitor the working state of the engine, and calculate the corresponding control amount according to the algorithm of the control software program, and drive the engine actuator to achieve effective control of the engine and meet the working requirements of the aircraft. [0003] The pressure signal is an important collection and monitoring parameter of the engine. The collected parameters mainly include intake pressure, compressor outlet pressure, fuel pressure and lubricating oil pressure, which are mainly used for engine control quantity correcti...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the problem that the pressure signal measurement of the current turbojet engine is carried out by direct acquisition or multiple sensors and acquisition circuits, the reliability is poor, the failure of signal acquisition cannot be identified, and the redundancy design increases the complexity of the system , proposed a turbojet engine pressure measurement and diagnosis method and device

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