Research On Acceleration Slip Regulation And Torque Distribution Control Of Distributed Drive Hybrid Electric Vehicle

The Acceleration Slip Regulation can prevent the drive wheel from slipping in the process of starting or accelerating caused by low adhesion of the drive wheel which caused by the sudden increase of the driving force;The torque distribution control system can prevent the car from slipping on the inside and outside of the wheel because of the speed difference,which causes the vehicle to lose its stability.Both of them have great effect on improving vehicle performance and driving stability and to avoid the vehicler out of control.For the increasingly popular distributed hybrid electric vehicle,the drive structure of the differences lead to its dynamic,stability control methods different from traditional cars and conventional hybrid vehicles.Therefore,this paper research the Acceleration Slip Regulation and torque distribution control strategy which applide in the distributed driving hybrid electric vehicle.The follows are the main research contents:(1)The characteristics of the distributed four-wheel drive hybrid vehicle drive system and the drive structure are systematically analyzed.The hybrid vehicle engine,ISG motor,wheel motor,tire model and vehicle model are established considering the simulation accuracy and simulation running time.The system dynamics model and the corresponding Simulink simulation model are established at the same time.(2)The basic principle of The Acceleration Slip Regulation is analyzed.The effect of the sliding of a single wheel on the vehicle and the influence of the relevant parameters on the wheel slip is researched based on the single-wheel dynamic mode.The influence of the system parameters on the stability of the vehicle is analyzed and the control strategy of Acceleration Slip Regulation under the straight running condition and the torque distribution control strategy under the turning condition is established.(3)Based on the fuzzy PID control algorithm,the anti-skid control algorithm based on fuzzy PID torque control is designed.Based on the fast and accurate torque response of the wheel motor and ISG motor,the fuzzy neural network control program is carried out on the basis of MATLAB fuzzy neural network control program.The torque distribution control algorithm is proposed to coordinate and distribute the torque of each power source reasonably.(4)In the MATLAB / Simulink simulation environment,in order to simulate the driving performance of the vehicle on different attached pavement,the off-line simulation analysis is did in the three typical conditions of the low attachment uniform road,separation road and docking road.The simulation results show that the driving anti-skid control strategy of the distributed driving hybrid vehicle can reasonably distribute the torque of each power source,effectively inhibit the excessive sliding of the driving wheels and improve the power of the vehicle.The simulation of low speed turning on the steering wheel Angle step is did.The simulation results show that the torque distribution control strategy can correctly select the intervention wheel and apply the appropriate interference torque,reduce the yaw rate in the process of steering and improve the lateral stability of the vehicle.