Optimal Control for Hybrid Electric Vehicle with Hydromechanical Transmission

Abstract

Modern hybrid power plants, used in vehicles, creates many challenges for developers. A one of important tasks is the optimal distribution power between internal combustion engine and electric motor and optimal control of the vehicle motion. The optimal control of hybrid electric vehicle (HEV) task should be solved with respect of the rated power of the electric motor, optimal controlling point of the internal combustion engine and the vehicle motion as a whole. The optimal control criteria should be consider with respect basic technical requirements, such as requirements of the fuel economy, electric power losses decreasing and reducing exhaust gas emission. This article presents power distribution strategy between electric motor and diesel engine of HEV with hydromechanical transmission based on Minimum Principle. The optimal control problem criteria is fuel economy and electric power losses has chosen. Strategy for optimal current control, algorithm and methods for the optimal control problem base on minimum principle with the respect reducing electric power losses criteria has been developed. Shooting method and Newton method for solution optimal control task for electromechanical systems were used. As a result, algorithms and computer programs of, the optimal motion control of HEV with hydromechanical transmission were developed