全液压失压制动反向调节制动阀动态特性研究

针对全液压失压制动系统制动过灵敏问题，通过分析反向调节制动阀结构组成和失压制动工作原理，建立失压制动系统反向调节制动阀动态数学模型和Simulink仿真模型；以踏板力激励为输入，研究反向调节制动阀在不同结构参数下制动压力的动态输出特性及变化规律；最后，利用整车实验台验证了仿真模型。结果表明：制动压力呈现弱非线性下降特性，适当增大反向调节制动阀偏置弹簧刚度和制动器容腔容积，减小调压弹簧刚度，能够有效延缓制动压力卸载速度，从而抑制制动过灵敏现象发生，保证制动的平稳。

Research on Dynamic Characteristics of Reverse Regulating Brake Valve for Full Hydraulic Pressure Loss Braking

In view of the over sensitivity of the full hydraulic pressure loss braking system by analyzing the structural composition of the reverse regulating brake valve and the working principle of pressure loss braking,a dynamic mathematical model and Simulink simulation model of the reverse regulating brake valve of the pressure loss braking system were established.Using pedal force excitation as input,the dynamic output characteristics and variation law of braking pressure under different structural parameters of reverse regulating brake valve were studied.Finally,the simulation model was verified by the vehicle test bench.The results show that the brake pressure exhibits a weak nonlinear decline characteristic.Properly increasing the bias spring stiffness of the reverse regulating brake valve and the volume of the brake chamber,and reducing the pressure regulating spring stiffness can effectively delay the unloading speed of the brake pressure,thus inhibiting the occurrence of brake oversensitivity and ensuring smooth braking.