采用键合图理论的HEV双行星排动力耦合机构功率流分析

Analysis of Circulating Power of Dual-Planetary Gear Hybrid Electric Vehicle Based on Bond Graph

针对双行星排式混合动力汽车由于动力耦合机构内部出现循环功率而导致的系统功率损失和传递效率下降现象,基于键合图理论,对双行星排式动力耦合机构进行优化设计。从双行星排式动力耦合机构功率传递路径和分配比重角度,分析系统循环功率流的产生机理,建立动力耦合机构不同驱动模式下的动力学模型。在此基础上,研究了各驱动模式下行星排特征参数对系统内部功率流的影响规律,确定了避免产生系统循环功率的一般条件,为双行星排式混合动力汽车动力耦合机构的优化设计提供了理论依据和参考。

Since internal circulating power of the power coupling device leads to power loss and transmission efficiency decline,an optimized design based on bond graph theory was carried out in the designing of the power coupling device. From the standpoint of power transmission paths and the power partition density,the generation mechanism of system circulating power flow was analyzed. And the dynamic model of the power coupling device in different driving modes was further established on the basis bond graph theory. In addition,the impacts of the planetary characteristic parameters on the system internal power flow were investigated,and the conditions to avoid circulating power were decided. The study provided the theoretical basis and guide for the optimization design of dualplanetary gear sets in hybrid electric vehicle.