Multi-channel capacitive liquid level sensor signal processing system and method

Abstract

The invention belongs to the technical field of monitoring and control, provides a multi-channel capacitive liquid level sensor signal processing system and method, and solves the problems of poor anti-interference capability and measurement precision of a traditional conditioning system and method due to the fact that a circuit is easily affected by the length of a cable and the wiring layout ofthe cable. The system comprises an excitation end suppression cable capacitance circuit, an acquisition end protection circuit and the like. The acquisition end protection circuit and the excitation end suppression cable capacitance circuit are utilized, so that the acquisition precision of the whole system is not influenced in the capacitance acquisition circuit; the excitation end suppression cable capacitance circuit has a function of suppressing front distributed capacitance of a cable; the acquisition end protection circuit has a function of suppressing rear distributed capacitance of thecable; and the acquisition end protection circuit can effectively protect the capacitor acquisition conditioning circuit, can effectively suppress current flowing through the multiplexer input interface, and can protect the multiplexer and other post-stage circuits. The system is high in measurement precision, high in interference resistance, easy to implement and capable of eliminating most measurement errors caused by the rear distributed capacitance.

Description

technical field

[0001] The invention belongs to the technical field of monitoring and control, and is mainly used for monitoring the amount of aviation fuel and lubricating oil. It specifically relates to an optimized processing method and system for multi-channel capacitive liquid level sensor signals, online real-time high security and suppression cable capacitance multi-channel monitoring of fuel liquid level, providing accurate fuel quantity information for control and monitoring systems. Background technique

[0002] In the state monitoring and control of aero-engines, the fuel level is monitored to provide accurate fuel quantity information and over-limit warning information for the engine control system and aircraft system, which is related to the correct control of the engine and flight safety, and is of great importance to the aviation field. significance. Accurate collection of aviation fuel and lubricating oil generally uses capacitive sensors, which can easily c...

Images