面向制动踏板感觉的主缸动力学模型及其关键影响因素

Master cylinder dynamic model for brake pedal feeling and its key factors

考虑回位弹簧的预紧力、系统摩擦力、阀口间隙以及制动液体积弹性模量的变化,建立了面向制动踏板感觉的制动主缸动力学模型。开展了不同推杆速度下的制动主缸特性试验,进而辨识了模型的关键参数。经过对比与分析发现,试验结果与仿真结果一致性较好。进而分析了影响制动踏板感觉的关键因素,结果表明:活塞内径、回位弹簧预紧力和刚度以及制动液气体含量对面向制动踏板感觉的制动主缸特性具有重要的影响。

A brake master cylinder dynamic model for brake pedal feeling is proposed,in which the return spring preload,system friction forces,valve port clearance and changes in the brake fluid bulk modulus are considered.Experiments on the characteristics of the brake master cylinder are carried out under the condition of different pushrod speed,and then the key parameters of model are identified.By analysis and comparison,it is found that the test results and the simulation results have agood consistency.Further,the key factors of the brake master cylinder for brake pedal feel are analyzed,and results show that the piston diameter,spring preload and stiffness,and the brake fluid gas content significantly influence the brake pedal feel and master cylinder performance.