Fast dynamics and low power losses of high-speed solenoid valve based on optimized pre-excitation control algorithm

Aiming at the requirements of high precision and reliability of digital hydraulic systems, high-speed solenoid valve (HSSV) needs to satisfy both fast dynamics and low power losses. In this paper, the dynamic performance and power losses of HSSV are studied by combining the coupling relationship between multi-physical fields, and based on the analysis conclusion, a control algorithm for HSSV is optimized based on pre-excitation control algorithm (PECA) to effectively speed up the switching behavior and reduce power losses. The theoretical and experimental results indicate that increasing the pre-opening voltage (POV) and reducing the pre-closing voltage (PCV) can shorten the switching delay time. However, the copper loss increases with the POV, resulting in a lower mechanical energy conversion efficiency. On the other hand, enlarging the opening voltage (OV) and closing voltage (CV) can speed up the switching process of HSSV, but it causes a significant increase in iron and copper losses. The dynamic performance and power losses of the HSSV are dimensionless mapped and the parameter group (POV = 3.6 V, OV = 14 V, PCV = 2.25 V, CV = -24 V) with optimum and well-balanced behaviors is selected with bubble scatter analysis and variation coefficient. The time required for HSSV to open and close was 1.21 ms and 1.71 ms, respectively, and the final temperature rising is optimized at 40.9 celcius. Therefore, the optimized PECA meets the expected requirements.