Pure Electric Vehicle Drive Control Strategy Development And Hardware-in-the-Loop Test

In the face of the global energy crisis and environmental degradation,pure electric vehicles have become the trend of industry development due to their advantages of low energy consumption and low emissions.But to achieve better power while meeting low energy consumption and low emissions,it is very important to develop a reasonable and complete control strategy.Vehicle control technology is one of the three core technologies of pure electric vehicles,and it is also the focus of research in recent years.The drive control strategy is one of the most basic strategies of the vehicle control strategy,shouldering the responsibility of controlling the vehicle to follow the driver's intention.According to the operation of the driver,the driver's intention is identified,and the operating state of the vehicle power system is comprehensively considered,the driver's desired torque for the driving motor is calculated,and corresponding commands are issued to make the driving state of the vehicle reach the driver's purpose as soon as possible.It plays a vital role in the performance of the entire vehicle.In this paper,the Vehicle Control Unit(VCU)is taken as the research object,and its driving control strategy is deeply studied.Based on the NI-PXI system,a hardwarein-the-loop test platform is built to test and verify the drive control strategy.The main contents of this paper are as follows:(1)Through the comparative analysis of the advantages and disadvantages of the current power system structure,the vehicle type with the traditional layout scheme is determined as the research object;according to the existing standards,the vehicle power performance index is designed,the parameters of driving motor and power battery are matched,and the matching results are checked.The results show that the parameters matching results can meet the set dynamic performance indicators.(2)Based on the research and analysis of existing drive control strategies and the complex mode switching of existing strategies,this paper proposes an adaptive vehicle working mode,which uses fuzzy control to determine the driving control strategy of target torque.The power and economy curves are used as boundary conditions,and the control of the motor torque is realized by using fuzzy control in consideration of driver's intention and vehicle state.The fuzzy controller and the drive control strategy model are established in MATLAB.(3)Combine theoretical knowledge and experimental data to model various parts of the vehicle.The driver model,the drive motor model,the power battery model and the vehicle dynamics model are integrated by forward simulation,and the offline simulation is verified under cyclic conditions.The results show that the actual vehicle speed and target vehicle speed error values can meet the requirements,indicating that the established model is effective.(4)Based on the D2 P rapid development platform and NI-PXI system,build a vehicle prototype rapid prototyping platform and a hardware-in-the-loop test platform.In the Simulink(MotoHawk)environment,build a drive control strategy model,generate code and brush into the controller.Under the NI-PXI system,build a hardwarein-the-loop test platform,configure and deploy the vehicle simulation model,simulate the real operating environment of the controller,complete the real-time test of the vehicle controller,and verify the rationality and effectiveness of the control strategy.