Abstract:This paper focuses on the characteristic parameter optimization of the planetary gear set (PGS),which is the teeth number ratio of the ring gear and the sun gear.And it is the critical part of the powertrain matching.At first,the power components were selected according to the vehicle performance and the criterions for the power components selection were presented.The energy management for the hybrid electric vehicle (HEV) was also formulated.Then the dynamics and the kinematic characteristics of the PGS were analyzed and the differential equations for the powertrain were constructed.A geometry technique was carried out for optimizing the characteristic parameter of the PGS.The result shows that there is a functional relationship among the optimized ratio,the vehicle maximum velocity and the maximum speed of all the power components.The simulation in the Advisor and the analysis show the match in the powertrain is reasonable.And the optimization method is validated.
