ISG型混合动力汽车中液力变矩器与发动机的匹配优化

Optimization for Matching the Torque Converter and Engine of ISG-type Hybrid Electric Vehicles

针对ISG型混合动力汽车传动系结构,开展了液力变矩器与发动机和ISG电机的匹配优化研究.首先,建立了匹配计算模型,得到其共同工作的输入输出特性曲线.然后,根据混合动力汽车整车性能的要求,建立了以液力变矩器循环圆直径为设计变量,整车性能指标为目标函数的优化模型,通过一维寻优求解得到最优解.利用软件平台,建立了整车动力学模型,在选定循环工况下,对优化前后整车性能进行了仿真.结果表明:优化后整车起步性能获得提高,燃油经济性得到明显提升.

Based on the power train structure of ISG -type （integrated starter/generator type） hybrid e- lectric vehicle （HEV）, the matching of torque converter （TC） and engine with ISG motor was studied. First, the matching model was established, and the input and output characteristics were simulated. Then, according to performance requirements of HEV, the optimization model was set up, the design variable was torus diameter, and objective function was the vehicle performance index. Optimal solution was obtained by the algorithm of one dimensional optimization. With the software platform, a dynamic vehicle model was built and the simulation was accomplished at selected driving circle. The results show that by optimization, starting quality of vehicle increa- ses and fuel economy is obviously improved.