基于AMESim的并联式液压混合动力车能量回收系统研究

Simulation Study Based on AMESim for Energy Recovery of Parallel Hydraulic Hybrid Vehicle

针对城市公交车频繁启停过程中存在能量利用率低的问题,分析了具有广阔应用前景的并联式液压混合动力车能量回收与辅助驱动系统的工作原理;应用机理建模的方法对二次元件(液压泵/马达)、蓄能器、转矩耦合器的参数进行了分析;基于AMESim仿真软件,建立了能量回收与辅助驱动模型,并进行了车辆液压制动和启动相关仿真分析。结果表明:减小蓄能器初始容积或提高蓄能器最低工作压力能够缩短车辆制动时间和制动距离,但能量回收率降低;增大蓄能器初始容积,能够获得更持久的辅助动力;增大二次元件排量,能够显著改善车辆制动和启动性能,但不影响能量回收利用率。该结论能够为并联式液压混合动力车的实际开发提供一定借鉴。

In order to improve the energy utilization rate in the frequent process of bus start-stop,we study the working principle of energy recovery and auxiliary driving system of parallel hydraulic hybrid vehicle.Using the mechanism modeling method,we analyze the parameters of secondary element （hydraulic pump/hydraulic motor）,accumulator and torque coupler.Applying the simulation software of AMESim,we build the model of energy recovery and auxiliary driving system and carry out the simulation analysis.The results show：firstly,reducing the initial volume or improving the minimum working pressure of accumulator can reduce the braking time and distance,but the energy recovery rate is decreased; secondly,increasing the initial volume of accumulator can obtain persistent auxiliary power; thirdly,increasing the displacement of secondary element can significantly improve the performance of vehicle braking and starting but also hardly affect the energy recovery rate.The conclusion can provide a certain reference for the actual development of parallel hydraulic hybrid vehicle.