Transmission system which directly relates to the dynamic and economic performance of vehicle has a great impact on the performance of electric vehicle. Aiming at the structural characteristics of the transmission system of a twospeed electric vehicle

by regarding transmission system as a rigid body system

the 3 degrees of freedom dynamics simulation model is built. And by using Matlab as a simulation tool

the response characterist ic of transmission system is gained. A basis for the mat ching of transmission components and the formulation of electromechanical control methods is provided by the simulation results.