Research On ESC Braking Force Distribution Strategy And Control Of Pure Electric Vehicles

Car sales have been reduced by 2018.But,since 2015,sales of new energy vehicles have been stagnant,and each year the world’s largest new energy production and sales country.Among them,green zero-emission characteristics of pure electric vehicles have developed rapidly.No matter what kind of car,the safety of chassis for manipulation and braking is the top priorityFirst,this article uses a centralized drive electric vehicle that gave rise to a traditional car.The vehicle,powered transmission modelled uses the structure of a centralized driving a pure electric vehicle.The traditional vehicle power model in Carsim software is used to remove the outdated engine model,clutch,and gearbox.A three-phase permanent magnet synchronous motor model and tire to slip ratio is built-in Simulink.Model,two software joint simulation constitutes a pure electric vehicle model.Depending on target vehicle speed and the actual vehicle body sped as a pure electric vehicle drive control strategy,ordinary TCS drove functions are realizedSecondly,bulit on the ESP hydraulic system structure of bosch8.1,based on it,the essential ESC hydraulic system structure is simplified,and the ESC hydraulic model is constructed using Amesim hydraulic software.Braking pressure converted by the brake pedalled angle sensor is used in the active brake cylinder.The signal uses the ESC active pump to generate the corresponding pressure to achieve linear pressure control.Each of the tire pressures increasing and reducing valves achieves linear switching control through a PWM duty cycle signal,and finally uses[0,S_最优]of,μ-S linear curve segments to achieve linear control of the tire braking force.Then,Carsim electric vehicle modelled,Amesim’s ESC hydraulic model,and Simulink controller were used to perform three software joint simulations to form a vehicle road model.Based on the motor drive control of the optimal slip rate and the brake system control of the threshold slip rate,dual TCS controlled by the motor and the brake system is achieved.Based on the optimal slip rate braking system control,ABS control is realized.Linear AYC yawed rate control and instability optimal slip rate AYC control based on the yaw rate of the vehicle body.Finally,acceleration data onto A002 electric vehicle 0-100km/h and 0-50km/h were compared with the results of A002 pure electric vehicle model to verify that the model is credible and the motor simulation control strategy is correct.By comparing the ABS braking vehicle data onto A002 with the matching simulation experiment ABS results,the surface simulation ABS control strategy is correct.Use the synchronization signal of the vehicle speed and steering wheeled angle obtained by the double shift test of the C201 car with ESP.The simulation resuits of the vehicle yaw rate data are similar to the actual vehicle data.It is alike,which proves that the AYC control strategy of the ESC hydraulic model is correct.