并联式混合动力车辆动力转换控制策略研究

Control Strategy on Power Conversion of a Parallel Hybrid Vehicle

从提高燃油经济性的角度出发 ,确立了并联式混合动力车辆传动系统的设计方案 ,建立了以直流电动机和发动机为动力源、金属带无级自动变速器为调速装置、行星排为动力转换器的并联式混合动力车辆动力学仿真模型 ,并分别以发动机最佳燃油经济性和电动机最佳效率为控制目标 ,分析了混合动力车辆由电动机驱动向发动机驱动转换时的综合控制策略 。

In order to improve the economic characteristic of a parallel hybrid vehicle, a new design scheme is proposed. A parallel hybrid vehicle is driven by a parallel combination of a direct injection spark ignition IC (internal combustion) engine and a DC motor interconnected by a metal pushing belt continuously variable transmission. The conversion of the powers, which are provided by engine and motor, is carried out by a planetary gear. In this paper, the simulation model on the dynamic characteristic of the hybrid vehicle is established using bond graph theory. When the power sources are converted from a DC motor to an IC engine, the control strategy is obtained. The control objectives are that the engine keeps on working along the optimal economy curve or the motor running in a higher efficiency. The research results will be applicable to the design for a parallel hybrid vehicle.