Modeling and simulation of a novel HEV automatic transmission system for heavy duty vehicles

This paper designed a new type of hybrid structure of automatic transmission for the heavy duty vehicles. After determining the parameters for the core components according to the working principles of the hybrid vehicle and performance requirements, the mathematical model of hybrid electric vehicles has been completed by using the Simulink. For the purpose of the vehicle's fuel economy and power performance, the control strategy based on the rules of logic threshold has been studied in this paper. The New European Driving Cycle(NEDC) as a benchmark for simulation analysis was made on the heavy duty vehicle model. Compared the simulation results with those of a traditional vehicle, the new structure of the hybrid electric vehicle can improve fuel economy significantly while meeting the dynamic performances.