非解耦式与解耦式电液复合制动系统及其评价

Investigation and Evaluation of Coupled /Decoupled Electro-Hydraulic Braking System

分析了电液复合制动系统的结构,对比了非解耦式和解耦式方案的优缺点;研究了电液复合制动系统前、后轴制动力及再生制动力、液压制动力的分配策略,对比了3种不同的协调控制方案.依据实车参数和测试数据,利用Simulink-AMESim建立了电液复合制动系统联合仿真模型;定义了以回馈能量效率和司机驾驶解释一致性作为不同方案的量化对比评价指标.NEDC和SC03循环工况结果表明,解耦式方案的回馈能量效率和司机驾驶解释一致性评价指标均优于非解耦式方案,两种工况下的回馈能量效率均高于50%.

In this paper,first,the structure of the electro-hydraulic braking system was analyzed,and the advantages and disadvantages of coupled and decoupled schemes were respectively compared.Next,the distribution strategy of the braking force loaded on the front-rear axle,the regenerative braking force and the hydraulic braking force was investigated,and three coordinated control schemes were proposed and compared.Then,based on the vehicle parameters and the test data,a co-simulation model of the electro-hydraulic braking system was constructed with Simulink-AMESim.Moreover,two indexes,namely the regenerative energy efficiency and the estimated consistence with the driver＇s intention,were defined to evaluate the coordinated control schemes.Finally,a simulation of the schemes was carried out under NEDC and SC03 driving cycles.The results show that the decoupled braking scheme is superior to the coupled one in terms of regenerative energy efficiency and estimated consistence,and that it helps to achieve a regenerative energy efficiency of more than 50％ under both NEDC and SC03 driving cycles.