Dynamic Characteristic Improvement of Water Hydraulic High-Speed on/off Valve by Optimizing PWM Control Parameters Based on NSGA-II

To improve the dynamic characteristic of water hydraulic high-speed on/off valve (HSV), the plus width modulation (PWM) control parameters are optimized based on a three-voltage control strategy. Firstly, the impact of the PWM control parameters on the dynamic performance of the HSV is studied by simulation. Then, a surrogate model of the mapping relationship between the PWM control parameters and the opening time and closing time of the HSV is established. Next, with the objective of the opening time and closing time of the HSV, the non-dominated sorting genetic algorithm II (NSGA-II) is employed to optimize the PWM control parameters. Finally, the simulation results show that the different PWM control parameters have different effects on the dynamic behavior of the HSV. After optimization, the opening time and closing time of the HSV can be reduced by 43.5% and 42.1%, respectively. In addition, the energy consumed in coil temperature rise is reduced by 29.7%. The findings of this study offer a practical approach to improving the dynamic characteristic of HSV.