Performance Enhancement of Hybrid Eclectic Vehicles by Introduction of a Novel Power Split Device

In this paper, an innovative power split device is introduced and a control strategy for a hybrid transmission using the device is developed. This transmission provides a mechanical connection between engine, two motors/generators and the rotational shaft which transmits drive force to the wheels. The controller receives battery state of charge (SOC), vehicle speed and power requested at wheels, and coordinates all componentsin such a way to optimize the entire system efficiency. A fuzzy logic controller is designed to sustain SOC in high regions and shift engine operating points to higher efficiency regions. A numerical optimization algorithm is used to control the engine speed in order to optimize the entire system, rather than optimizing only the engine. Matlab-Simulink and Advisor software are used for vehicle modeling, simulation and implementationof the controllers. Simulation results demonstrate remarkable improvements in fuel economy relative to simulation with default controller of Advisor.