Study On Regenerative Braking Control Strategy Of Parallel Hybrid Electric Vehicle With Axles Torque Coupling

The difference between HE Vs and traditional cars is that HEVs have a variety of power sources,that is,they can be powered by engines and can be provided by batteries.Therefore,HEVs have good fuel economy while ensuring power.The parallel hybrid electric vehicle with axles torque coupling is different from the traditional parallel hybrid electric vehicle,the engine and the battery drive the front and rear wheels,respectively,and then through the ground for power coupling,so when the torque demand is larger,the four-wheel drive can be realized.Due to its good dynamic performance,the simple structure has been the attention of many manufacturers,the future will have broad prospects for development.In this paper,the inter-axles torque-coupled parallel hybrid electric vehicle is taken as the research object,and the research on braking energy recovery strategy is carried out.The main contents of this dissertation include:(1)According to the parameter matching of the inter-axle torque-coupled hybrid electric vehicle,the dynamic performance is verified under different road conditions and compared with the traditional hybrid vehicle.(2)Through the dynamic analysis of the target vehicle model,a reasonable braking force distribution strategy is formulated under the restraint of regenerative braking to recover as much braking energy as possible on the basis of ensuring the braking safety.(3)Based on the MATLAB/Simulink software system,the simulation module of all components(engine,motor,battery,transmission system,power system,etc.)of the target vehicle and the preparation of vehicle and brake force distribution strategy are established.(4)Based on the D2P rapid prototyping system,real-time verification of the entire model and strategy is done by building a driver-in-loop simulation system,and the D2P real-time simulation system results are compared with the offline simulation results.The control strategy proposed by the simulation of off-line driver real-time simulation based on D2P rapid prototyping system is very effective and real-time.