四驱混合动力轿车串联式电液复合制动仿真

针对自主开发的四轮驱动混合动力轿车,设计了串联式制动能量回收系统。基于制动安全性和最大化回收制动能量的原则,提出了ABS液压制动与再生制动协调控制的电液复合制动控制策略。该策略先根据驾驶员的操作实时计算制动强度和总需求制动力矩,然后依据制动强度大小对总需求制动力矩进行分配,并且实时检测车轮滑移率以判断是否切换到ABS独立工作模式。并在Simulink软件平台上建立了样车动力传动、制动系统及控制策略模型,分别在轻度、中度和紧急制动三种制动工况下仿真了串联式制动能量回收系统的性能。仿真结果表明:所提出的电液复合制动控制策略能有效地提高制动能量的回收效率,且在紧急制动时能保证车辆的制动稳定性能。

Simulation on Series Electro-hydraulic Combined Braking for 4WD Hybrid Electric Car

A new type of series regenerative braking system was designed for 4WD-hybrid electric car.Based on a principle of braking safety and maximize energy recovery,a electro-hydraulic combined braking control strategy for the sake of coordinately controlled between regenerative braking and ABS hydraulic braking was proposed.This strategy firstly calculated the braking strength and the braking torque required on the basis of driver’s operation,then according to braking strength,the braking torque required was distributed,besides judging when would the operating mode switch to ABS mode by real-time detection of slip ratio.Simulation model including powertrain,braking system and control strategy was modeled on Matlab/Simulink,the performance of Series Regenerative Braking system was respectively verified in the condition of slight braking,moderate braking and emergency braking.The simulation results show that the proposed strategy obviously improves the braking energy recovery efficiency,meanwhile making sure that the car has a good braking performance in an emergency braking condition.