Intelligent Driving Method of Digital Valve Based on Soft Measurement of Valve Core Displacement

doi:10.3901/JME.2024.04.155

Abstract

Abstract: Under the current driving control method, the digital valve has the problems of slow dynamic response, small static linear controllable range, and high power. An intelligent driving method of the digital valve based on a soft measurement of the valve core displacement is proposed. The mechanism model of the digital valve is established, and the dynamic response process of the digital valve is analyzed. The driving voltage and valve inlet pressure are the key parameters affecting the response speed of the digital valve.The valve core displacement soft measurement model is established, and the influence of the correction temperature on the displacement soft measurement model is analyzed by finite element simulation and experimental analysis. The accuracy reaches 92.04 %. Based on the influence of key parameters on the dynamic response of the digital valve, an intelligent drive method is proposed. The soft sensor value of the valve core displacement is used as the condition of accurate switching in the multi-stage drive stage. In the maintenance stage, the driving signal is adjusted intelligently to adapt to the change of pressure. The experimental platform of the digital valve performance test is built to verify the effectiveness of the intelligent drive method. The results show that compared with the single voltage drive method, the intelligent drive method can reduce the opening and closing response time by 43.9%. The linear range of the duty cycle-flow characteristic curve is increased by 20%, the saturation range is less than 10%, and the power loss is reduced by 66%. It effectively improves the dynamic and static characteristics of the digital valve, reduces the power loss of coil.

Key words: digital valve, displacement soft measurement, dynamic response, intelligent drive method, energy saving

CLC Number:

TH137

YAO Jing, YANG Shuai, YIN Hang, WANG Yunchang, WANG Wenjing, QIU Mingjun. Intelligent Driving Method of Digital Valve Based on Soft Measurement of Valve Core Displacement[J]. Journal of Mechanical Engineering, 2024, 60(4): 155-166.

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