Abstract:Good dynamic characteristics are the key to accurate flow control of high speed on/off valve. However, the existing drive control strategy of high speed on/off valve ignores the influence of temperature rise generated by variable voltage excitation on the dynamic response characteristics of high speed on/off valve. In order to improve the dynamic response and improve operational reliability, a variable voltage drive control method based on temperature feedback is proposed in this paper. Firstly, the electromagnetic thermal coupling simulation model of high-speed on/off valve is established based on Maxwell and thermal, and the influence of coil turns, driving voltage and ambient temperature on coil temperature rise are analyzed. The results show that an increase in drive voltage exacerbates coil temperature rise. Secondly, the influence of temperature change on the dynamic response characteristics of high speed on/off valve is further explored. The results show that with the increase of temperature, the opening delay time increases, while the closing delay time decreases. Based on this, a variable voltage drive control strategy considering temperature feedback is proposed, and a simulation model is built in Simplorer to verify the effectiveness of the control strategy. Finally, the performance test bench of high speed on/off valve is set up, and the control effect of single voltage control and variable voltage control strategy are compared through experimental analysis. The test results show that, compared to traditional single-voltage control, the proposed variable-voltage control strategy based on temperature feedback reduces the closing lag time of the high-speed on/off valve by 5.55 ms and lowers the steady-state coil temperature by 24.5℃. These improvements effectively improve the dynamic response characteristics and operational reliability of the high-speed on/off valve.