Development of Parametrically Integrated Software Platform for Passenger Car Brake System 2019-01-1231
Braking system plays a central role in occupant protection, which directly affects the automotive active safety and steering stability. In this paper, a novel parametric integrated software platform is developed to quickly calculate, simulate and analyze the component characteristics and overall performance of hydraulic servo brake systems. At first, according to the structure and properties of the hydraulic servo brake system, the relationships between the caliper's required fluid volume, pedal feel characteristics and braking performance is theoretically analyzed. Then based on the braking dynamics, the mathematical model of the hydraulic servo brake system which composed of brake pedal, vacuum booster, brake master cylinder, brake pipe and brake wheel cylinder is built, and the corresponding simulation model is established in the AMESim software. Besides, the accuracy of the simulation model is verified by the bench test and the actual vehicle test, and the sensitivity analysis of the caliper required liquid volume parameters is carried out. The influence of the main parameters is the pipe pressure ≥ piston return amount ≥ caliper rigidity. Finally, the “ECE” evaluation system and industry requirements is used to evaluate the design automotive braking system and the optimization scheme is put forward. The results show that the software platform has powerful functions and friendly user interface. By means of visualization and parametric integration, the software platform can be used not only as a calculation, design and analysis of hydraulic brake servo systems, but also as a reference for pneumatic brake systems and brake-by-wire systems, such as pedal feel design, braking performance analysis, etc.
jin pan, Xuexun Guo, Wei Zhou, Xiaofei Pei, Hao Pan, Jie Zhang
Zhejiang Wanxiang Precision Industry Co, Wuhan Univ of Technology