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

A liquid level sensor and signal processing technology, which is applied to liquid level indicators, liquid level indicators, instruments, etc. for physical variable measurement, and can solve problems such as poor anti-interference ability, poor measurement accuracy, and influence of cable wiring layout

Pending Publication Date: 2021-02-09
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-channel capacitive liquid level sensor signal processing system and method to solve the traditional conditioning system and method because the circuit is easily affected by the length of the cable and the layout of the cable, resulting in poor anti-interference ability and measurement accuracy The problem

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0128] From figure 1 It can be seen that the multi-channel capacitive liquid level sensor signal processing system in this embodiment includes an excitation circuit, a driver, an excitation end suppression cable capacitance circuit, a protection circuit, an acquisition end protection circuit, a multi-channel acquisition controller, a current conversion voltage circuit, Integral amplification circuit, sample hold and filter circuit, negative feedback circuit, A / D acquisition unit and processor; excitation circuit, driver, excitation terminal suppression cable capacitance circuit and protection circuit are electrically connected in sequence; the oil level sensor to be tested in each test channel The input end is connected to the output end of the protection circuit through the capacitance detection cable; the output end of the oil level sensor to be tested in each test channel is respectively connected to the input end of each collection end protection circuit through the capacit...

Embodiment 2

[0167] Different from Embodiment 1, the input end of the negative feedback circuit in this embodiment is connected to the output end of the sample-hold and filter circuit, and the output end of the negative feedback circuit is connected to the output end of the multi-channel acquisition controller; and the output voltage of the filter circuit is fed back to the reference capacitor C ref , to form a new reference capacitor current value, to realize the dynamic balance between the capacitive sensor current to be measured and the reference capacitor current, so that the sample hold and filter circuit output V out_p Acquisition to the A / D acquisition unit; the post-stage modulation and demodulation self-balancing AC bridge circuit of the present embodiment is as Figure 7 shown. Because other circuits and functions are the same as those in Embodiment 1, only the sample-hold and filter circuits are described here, from Figure 7It can be seen that the sample hold and filter circu...

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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...

Claims

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Application Information

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IPC IPC(8): G01F23/26G01F23/00
CPCG01F23/266G01F23/802
Inventor 赵建平毛宁刘源王国振冯浩
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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