湿式离合器先导式电液调压阀时频域建模与分析

The pilot-operated electro-hydraulic pressure regulating valve (POEHPRV) is the core component of the high-power wet clutch shifting system. Due to the time-varying and strong nonlinear characteristics of its parameters in multiple stages, its frequency response characteristics are changed, which in turn affects the speed and stability of pressure response during the shifting process. The mathematical model of the POEHPRV is established based on analyzing the working principle of the POEHPRV and considering the variability of the damping coefficient, flow coefficient, and gain coefficient with oil temperature in the working process. The frequency-domain model is further built. The time-domain and frequency-domain response characteristics of the POEHPRV under different parameters are studied, and the influence of parameter variations is analyzed and discussed. The results show that increasing the bandwidth of the system response increases the pressure response speed but can reduce the damping ratio and increase the adjustment time of the pressure response. The structural parameters of the system, the input signal, and the oil temperature all affect its response characteristics. The response speed and stability of the POEHPRV in the whole working range can be quickly judged with this method, which helps improve the oil pressure dynamic tracking performance of the POEHPRV.