Development And Hardware-In-The-Loop Testing Of Vehicle Control Unit For Dual-Shaft-Drive Electric Vehicles

With the development of social economy,in order to solve the problem of environmental pollution and energy crisis,China has proposed a major strategy to vigorously develop new energy vehicles.The development of battery electric vehicles was tremendous.The dual-motor-dual-shaft-drive electric vehicle(DMDSDEV)has better fuel economy and dynamic property than the single-motor-single-shaft-drive electric vehicle.This configuration is also one of the research hotspots in the field of electric vehicles.In this paper,the vehicle control unit of DMDSDEV is studied,aiming at fully exploiting the potential of the configuration and improving vehicle’s performance.The topology of the CAN network of DMDSDEV was studied and developed.According to the functions and operating conditions of each part,the communication protocol of the CAN network was formulated.The performance of CAN network was simulated and verified in the CANoe software platform,and the design and development of CAN network was completed.The hardware of the vehicle control unit was developed,including the design of the schematic diagram,the drawing,machining and soldering of the PCB.By analyzing the components of the DMDSDEV,a forward-facing vehicle simulation model based on MATLAB/Simulink was established.The model includes a driver model,a motor and controller model,a battery and controller model,a power transmission system model,and a vehicle longitudinal dynamic model.The driving torque distribution strategy of DMDSDEV was formulated based on the inertia weight linear decreasing particle swarm optimization.The minimization of electric power requirement is the optimization goal of this strategy.A Model-Based-Design method is used to finish the development of vehicle control strategy that includes high-voltage power-on,accelerator pedal processing,gear selection,demand torque calculation,driving torque distribution,energy recovery,and fault diagnosis strategy and so on.The hardware-in-the-loop and road test verified the feasibility of the vehicle control unit.The function of the vehicle control unit meets requirement and expectation.