Optimal control of an electromagnetic power-split hybrid electric vehicle

Abstract

A new electromagnetic power-split hybrid electric vehicle is introduced in this paper. This system, which has a dual-rotor brush motor, was developed with the aim of combining all the advantages of an internal-combustion engine and two electric motors in an optimal way so as to improve the power performance and the fuel economy. This system can be used as an electromagnetic, continuously variable transmission. The architecture and analogy of the electromagnetic power-split hybrid electric vehicle are analysed; a control strategy is designed and explained in detail. The system’s optimal zone is designed. To evaluate the performance and the control strategy, the tests were performed on the chassis dynamometer under the New European Driving Cycle. The economic performance of the electromagnetic power-split hybrid electric vehicle is analysed. The operational zones of the engines of an electromagnetic power-split hybrid electric vehicle and of a conventional vehicle were compared. The results indicate that the designed vehicle control strategy of the electromagnetic power-split hybrid electric vehicle worked properly under the New European Driving Cycle and that the engine worked in the optimized zone. The average fuel consumption under the New European Driving Cycle is 4.75 l/100 km; the saved petrol ratio is 41.3% compared with that of the related prototype vehicle.