基于前置并联式结构的液压混合动力节能特性研究

Research on the Energy Saving Performance of Hydraulic Hybrid Based on Front⁃mounted Parallel Structure

传统后置式并联液压混合动力车辆中二次元件在运行时会出现长时间超速或低速工况。为尽可能提高车辆燃油经济性,同时使二次元件尽可能工作在高效区间,提出将转矩耦合器置于发动机与变速器之间,并称此种结构为前置并联结构。其特点是液压混合动力系统通过变速器调速增扭后,再将动力传递至驱动桥。通过建立液压混合动力汽车的仿真模型,对车辆发动机做功、油耗、起步加速性能等进行对比分析,并进行了实验车验证。结果表明:前置并联混合动力结构能量回收再利用率高,节能效果明显;该结构可以有效提升车辆的动力性能和爬坡性能。

The pump/motor in traditional rear⁃mounted parallel hydraulic hybrid vehicle will have long⁃term overspeed or low⁃speed operating conditions during operation.In order to improve the fuel economy of vehicles and make the pump/motor working in the high efficiency range as much as possible,the torque coupler was put forward to be placed between the engine and the transmission,which was called the front-mounted parallel structure.Its feature was that the hydraulic hybrid system would increase the torque after adjusting the speed of the transmission,and then the power was transfered to the drive axle.By setting the simulation model of the hy⁃draulic hybrid vehicle,the engine power,fuel consumption,starting acceleration performance of the vehicle were compared and ana⁃lyzed,and the experimental vehicle verification was carried out.The results show that the front-mounted parallel structure has a high energy recovery and reuse rate,and the energy saving effect is obvious.Using this structure,the dynamic performance and climbing performance of the vehicle can be improved effectively.