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Faced with great pressure in energy and environment,the hybrid electric vehicle(HEV) has become an important development trend of the automobile industry.The HEV is remarkably different from traditional vehicles,and puts more requirements and dependencies on the control system,due to its unique and complicated energy and driving systems.Such a system can be formulated as a class of hybrid switching dynamic system with high uncertainty and strong nonlinearity,and the performance of optimization and control strategy is closely linked with the economy,reliability,safety and the comfort of the HEV.However,there are still many challenges in designing a controller for the energy and driving system of the HEV.Fortunately,modern control theory and technology provide key methods to overcome these technical bottlenecks in energy and driving system of the HEV.From the viewpoint of system and control science,this paper profoundly and comprehensively summarized some key scientific and technical issues and their development,such as the energy management strategy of the HEV energy and driving systems,the state estimation of the HEV traction battery,and the optimal control of the HEV driving system etc.Finally,the challenges and development tendency of the optimal control technologies and theories on the HEV energy and driving systems were also pointed out. |
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