中文摘要：

混合动力系统具有节能和环保优势，为了提高混合动力系统的燃油经济性，结合ISG（integrated starter generator）型速度耦合混合动力系统的结构，构建了系统动力学模型。利用动态规划方法，设计了以发动机节气门开度和电机转矩为控制变量，以发动机转速和电池SOC等为状态变量，以整个循环发动机燃油消耗最低为目标函数，电池SOC维持平衡和限制频繁换挡为附加代价函数的动态规划算法。仿真结果表明：与传统的基础车型相比，混合动力系统燃油经济性提高了35．5％。

英文摘要：

Hybrid system has the advantage of energy conservation and environmental protection. To improve the fuel economy of a hybrid system, based on the structure of the ISG velocity coupling HEV （hybrid electric vehicle）,a dynamics simulation model is built. By using dynamic programming（DP） global optimization method, the variables of the engine throttle and the motor torque are set as the control variables, and the engine speed and the battery SOC are set as the state variables, the engine fuel economy is set as the objective function,and the battery SOC balance and the limited frequent shifting are set as the additional cost function. Then a global optimization program is built, and the simulation results indicate that the fuel economy of DP control HEV is 35.5% more efficient than that of the conventional vehicle.