湿式离合器先导式电液调压阀时频域建模与分析

先导式电液调压阀是大功率湿式离合器换挡系统的核心部件，由于其多个环节存在参数时变和强非线性特征使其频率响应特性发生变化，进而影响换挡过程的油压调节的快速性与稳定性。在剖析先导式电液调压阀工作原理的基础上，考虑阻尼系数、流量系数和增益系数随油温的可变性，建立了先导式电液调压阀在工作过程中的数值模型，并推导了其频域模型。研究了先导式电液调压阀在不同参数下的时域和频域响应特性，得到了参数变化的影响规律。结果表明：增加系统响应的带宽会提高油压响应速度，但会降低阻尼比，使得油压响应的调节时间增加。系统的结构参数、输入信号以及工作油温均会影响其响应特性。基于该方法能够快速的判断先导式电液调压阀在全工作范围内的响应速度和稳定性问题，从而有助于改善先导式电液调压阀的油压动态跟踪性能。

Time-Frequency Domain Modeling and Analysis of Dynamic Characteristics of Pilot-Operated Electro-Hydraulic Pressure Regulating Valve for Wet Clutch

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.