新能源汽车解耦式电液复合制动系统

Decoupled electro-hydraulic brake system for new energy vehicles

设计集成有制动踏板感觉模拟、液压助力和失效制动备份功能的一体式制动主缸,并依此开发制动踏板与轮缸压力解耦的电液复合制动系统。考虑ECE R13法规和电动机、电池组外特性约束,以有效回馈功率为优化目标,制定解耦式电液复合制动系统的制动力分配控制策略。利用MATLAB/Simulink-AMESim建立解耦式系统的联合仿真模型,结合硬件在环仿真台架试验,考核其液压控制性能及制动力配控制策略。结果表明:解耦式电液复合制动系统实现轮缸压力的精确控制,并有效地回收制动能量,在NEDC循环工况下,其制动能量回馈效率可达54.8%。

A master cylinder integrated with brake pedal feel simulator, hydraulic brake booster and failure backup was designed, and an electro-hydraulic brake system using the cylinder was developed, whose brake pedal force and wheel cylinder pressure were decoupled. Considering ECE R13 regulations and electric motors, battery pack characteristic constraints, braking force distribution control strategy was developed to achieve the optimized regenerative power. A co-simulation model in MATLAB/Simulink-AMESim was established and a hardware-in-the-loop test beach was used to verify the hydraulic pressure control performance and the braking force distribution strategy. The results show that the decoupled system can achieve precise control of the wheel cylinder pressure and the efficient braking energy regeneration, which reaches 54.8% under the NEDC driving cycle.