Energy Management Strategy For A Distributed Hybrid Vehicle

The distributed hybrid power is driven by a front axle engine and a power transmission mode driven by a rear axle motor.In engineering,it is often called the P4 architecture.Because of its simple structure and easy implementation of the transformation from conventional power vehicle to hybrid power,the architecture is a hybrid structure that the vehicle companies pay close attention to at present.Because the rear axle motor system can not only realize the drive,but also recover the braking energy to generate electricity,the hybrid structure has both power and economy,which has been used well at home and abroad.How to match the power system and formulate the energy management strategy of the whole vehicle will be the key to achieve the above functions.This paper takes a SUV conventional power vehicle as the research object,and explores the energy management strategy and fuel saving effect after 48 V P4 structure hybrid transformation.The main research contents include:(1)develop the performance index of the modified vehicle,and match the new power system parameter with reference to the dynamic index.(2)build vehicle model and energy management controller model by using AVL CRUISE and MATLAB software.The threshold value method is applied to divide the state of the power and the dynamic demand,and formulate the energy management strategy.(3)adjust threshold parameters and perform dynamic and economic simulation.Under the condition of NEDC,the dynamic performances of the two cars were compared,and the influence rule of each threshold parameter on the comprehensive fuel consumption was obtained.(4)a complete vehicle verification test was carried out.The results show that each functional mode of the prototype car can run normally,and has good fuel saving efficiency.