Driving Torque Control Strategy Design And HIL Test Of Pure Electric Vehicle

In order to cope with the environmental pollution and energy shortage caused by fuel vehicles,the state has introduced new policies in the automotive industry,and the automotive industry is gradually moving towards electrification,making new energy vehicles a new trend in the industry,and a large number of new energy automotive enterprises have emerged.As the key control part of electronic control system in electric vehicle,vehicle controller collects the operation signals from drivers and other parts of the vehicle,makes analysis and judgment of the input signals and sends corresponding instructions to control the actions of the slave nodes,thus ensuring the safe driving of the vehicle.The main functions of pure electric vehicle controller include: vehicle torque control,vehicle energy management,fault diagnosis,vehicle condition management,accessories management,etc.It plays a role in controlling vehicle operation.As the advanced software of the controller,the application layer software of the vehicle controller directly affects the safety,comfort,economy and power of the pure electric vehicle driving.Driving torque control strategy is the key technology of vehicle control strategy.This paper relies on the national key project 6.2 "High Performance and Low Energy Consumption Electric Car Chassis and Whole Vehicle Development"(No.2017YFB0103700).The task undertaken by the research group is to complete the development of the driving torque control strategy in the application layer software of vehicle controller.Firstly,according to the basic structure of pure electric vehicle in this project,the function of vehicle controller in pure electric vehicle and its development mode are analyzed,and the application layer software is divided into several modules,including the management of power up and down,charging and discharging,vehicle condition management,instrument display,torque management,accessories management,energy management and fault diagnosis.Secondly,the function modules of the driving torque management system in the torque management module are described in detail,including creeping torque control,accelerating pedal torque control,constant speed cruise torque control and limping torque control.The control strategies of these modules are formulated and the model is built.The driving torque limitation is formulated for the vehicle's safety and driver's driving experience.The comfort of the vehicle is ensured by the coordinated control strategy.Finally,the basic principle and advantages of hardware-in-the-loop test are introduced.After the test platform is built and the correctness of the controlled object model is verified,the hardware-in-the-loop test is carried out under the typical working conditions of each functional module of the drive torque control strategy,which verifies the feasibility and correctness of the control strategy,and lays a foundation for the subsequent vehicle calibration and road test.