The Research Of Braking Energy Recovery Control Strategy Of Plug-in Hybrid Electric Vehicle

Due to energy shortage and environmental pollution, energy-saving and environmental protection have become the theme of the modern automobile industry development. Plug-in hybrid electric vehicle not only keep the advantages of traditional automotive with long driving range and good kinetic, but also can play to the strengths of high efficient and low-emission of electric vehicle. In the situation that no breakthrough in the battery technology is acquired and charging facilities are not perfect, and the traditional petrochemical energy refueling facilities are very complete, PHEV is currently a good choice for energy saving and environmental protection and the use of economic issues. Based on the optimization of this type of hybrid electric vehicle’s control strategy and application of the brake energy recovery technology, we can combine the characteristics of the traditional fossil vehicles and pure electric vehicles together, to achieve lower emissions and higher fuel economy. Thus PHEV is increasingly favored by the general public, meanwhile the major car companies also actively develop and introduce such models.This paper is in the background of the Laboratory and a company’s cooperation project on the Plug-in hybrid Industrialization Exploitation. Certain studies are conducted on the parameter matching for kinetic system and control strategy for braking energy recovery. According to vehicle design indicators, such as dynamics and economic, and knowledge of the theory of automobile, the selection and parameter matching for the engine, electric motor and battery were done. On the basis of the analysis on characteristics of the vehicle during braking, a braking energy recovery strategy is proposed. The control model of braking energy recovery and the ultimate model of the real car are established in Simulink and Stateflow, and the models are verified by logic verification. Finally, analysis of the various working conditions of the braking energy recovery rate, as well as the verification of the effectiveness of the braking energy recovery strategy were got through real vehicle test.