Aero-engine thermal resistance temperature sensor fault self-detection device and method

Abstract

The invention discloses an aero-engine thermal resistance temperature sensor fault self-detection device and method. Aiming at two thermal resistance signal processing modes of a constant-voltage excitation bridge circuit and a constant-current excitation bridge circuit, a fault self-detection circuit and a fault self-detection method are respectively designed, and the constant-voltage excitationthermal resistance fault self-detection circuit comprises an unbalanced bridge circuit, a filter circuit, an amplifier circuit and an analog-to-digital conversion and controller circuit; the constant-current excitation thermal resistor fault self-detection circuit comprises a reference resistor, an amplifier circuit and an analog-to-digital conversion and controller circuit. When the sensor is normally connected, the output voltage of the constant-voltage excitation fault self-detection circuit and the output voltage of the constant-current excitation fault self-detection circuit are within anormal range, when the sensor is broken or short-circuited, the output voltage of the constant-voltage excitation fault self-detection circuit and the output voltage of the constant-current excitationfault self-detection circuit exceed the normal range, and the controller can judge the fault of the thermal resistance sensor. According to the invention, the disconnection fault and the short circuit fault of the thermal resistance temperature sensor can be detected, a standby channel is switched when the thermal resistance temperature sensor fails, starting and stopping are prohibited, and thesafety of the aero-engine is ensured.

Description

technical field [0001] The invention belongs to the technical field of sensor fault detection, relates to a temperature sensor fault self-detection technology, in particular to a device and method for aero-engine thermal resistance temperature sensor fault self-detection. Background technique [0002] When the thermal resistance temperature sensor is used in the aero-engine, it is generally used to measure the total intake temperature of the aero-engine, and PT100 platinum resistance is mostly used. As the temperature increases, the resistance value increases, and the total inlet temperature range of the aero-engine is expected to be -55℃~100℃ , The signal characteristic is 78Ω~140Ω, and the thermal resistance temperature sensor can be connected in a three-wire system or a four-wire system to eliminate the measurement error caused by the resistance of the connecting wire. [0003] In the prior art, the thermal resistance temperature signal processing generally adopts constan...

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Problems solved by technology

The existing circuit for processing the temperature signal of the thermal resistance only processes the temperature of the thermal resistance sensor, does not judge whether the thermal resistance temperature sensor has a disconnection fault or a short circuit fault, and then cannot prohibit starting and switch the backup channel when the thermal resistance temperature sensor fails and other operations, the reliability and safety of aero-engine operation cannot be guaranteed

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