Optical measurement of high-speed solenoid valve switching-on characteristics

doi:10.3785/j.issn.1008-973X.2020.01.002

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (1): 17-22 DOI: 10.3785/j.issn.1008-973X.2020.01.002

Mechanical Engineering

Optical measurement of high-speed solenoid valve switching-on characteristics

Hao TIAN(

),Yu-ren ZHAO

Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China

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Abstract

A sensor-less coil current-inductance based spool displacement polynomial model was proposed and key coupling parameters were obtained from designed experiments in order to address the drawbacks of the affected dynamic characteristics of the valve core by the externally connected sensor. The coupled electromagnetic models of the on-off solenoid valve were developed, and the time-varying inductance-spool displacement model was derived. A solenoid valve optical experimental system was constructed, and the non-contact single beam laser measurement method was used to capture the valve spool displacement. An algorithm for inductance-displacement fitting was established. The results from the model and experiments were compared when the coil voltage was tested from 25 V to 29 V, and the spool was set in air or oil. Results showed that the average estimation error of the inductive method in air and oil environment was 7.0% and 9.2%, and the sensitivity to coil supply voltage variation was low. The model is suitable for valve spool displacement sensing.

Key words： solenoid on-off valve spool displacement model laser triangulation sensor inductance measurement

Received: 13 December 2018 Published: 05 January 2020

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Cite this article:

Hao TIAN,Yu-ren ZHAO. Optical measurement of high-speed solenoid valve switching-on characteristics. Journal of ZheJiang University (Engineering Science), 2020, 54(1): 17-22.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.01.002 OR http://www.zjujournals.com/eng/Y2020/V54/I1/17

高速电磁阀开启特性的光学测量

针对接触式传感器改变阀芯动态特性的问题，提出基于励磁线圈电流-电感特征的阀芯位移无传感器多项式模型，通过光学试验获取位移-电感耦合参数. 建立电磁开关阀磁路与电路的电磁耦合模型，得到励磁线圈时变电感与阀芯位移的函数关系. 搭建电磁阀光学测量试验系统，采用非接触式单束激光测量方法，在空气环境下捕捉阀芯位移. 建立阀芯电感-位移拟合算法，在25~29 V驱动电压、空气及油液环境下，对比电感求解与光学测量的阀芯位移. 结果表明，空气与油液环境下电磁阀电流-电感阀芯位移估计模型的平均估计误差分别为7.0%和9.2%，模型对驱动电压变化的敏感性小. 利用该模型可以较好地估计阀芯开启过程的位移变化.

关键词： 电磁开关阀, 阀芯位移模型, 激光三角测量传感器, 电感测量

Fig.1 Structural diagram of SV08-25 solenoid-operated on-off valve

Fig.2 Electromagnetic schematic diagram of valve’s driving coil

Fig.3 Analysis of laser optical path in the oil environment

Fig.4 Optical measurement system

Tab.1 Major parameters of laser displacement sensor

Fig.5 Laser displacement sensor calibration curve

Fig.6 Extraction of desired coil current and laser displacement sensor signal sections

Tab.2 Inductance-displacement polynomial model coefficients

Fig.7 5th order polynomial fitting of inductance and spool displacement

Fig.8 Comparison of inductance model and laser displacement sensor measurement results

Fig.9 Absolute error between inductance model and laser displacement measurement results


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