Study On The Control Of The Traction Of Electric Vehicle That Installed The Wheel Hub Motor

Because the whole world is all impacted of the energy crisis and the environmentalpollution, the auto industry which cause energy consumption and emission pollution needs anew creation and development. Hybrid Electric Vehicles and Pure Electric Vehicles with theadvantages of Low fuel consumption and low fuel consumption or zero fuel consumptionand zero pollution has become an important direction of research. Although Hybrid Vehiclescan reduce the fuel consumption, but eventually it cannot but use the fuel, therefore PureElectric Vehicles became the best choice. The pure electric vehicles driven by the wheel hubmotor is the focus of attention in recent years. For its installing the wheel hub motor directlyin the wheel, so it can save the space, light the weight of automobiles and easily facilitatesthe achievement of the traction control.The traction control system is in accordance with the car’s driving rules, and control thewheel skid to achieve the purpose of control system in order to achieve the best driving forcecontrol status. Traction control system can take the initiative to control the wheel drivingforce to improve vehicle dynamic, vehicle maneuverability and driving safety, and is usedwidely because all these good performance. The Four independent wheel motor-drivenelectric vehicles, omit and simplify the transmission system, and reduce the quality of thevehicle, and finally achieve the light-weight goal. It can also recovery braking energy ofindependent wheel individually to make use of the car energy better. The traction controlsystem can also optimize the car chassis and better realize the initiative, electronize andintelligentize of the automobiles.The driving force and driving torque mostly depends on the engine output torque whenconventional cars driving on the road. And the driving force and driving torque will be underthe limit of the road tyre-road friction estimation. If we do not control the driving force, the wheels tend to produce excessive skid. Road friction estimation is in direct proportion to thefriction estimation and the friction force. The traction control technology absolutely uses thebest slip-rate range to control the vehicle drive wheel slip-rate in this range, so this canimprove the ability of the car started.Road recognition and traction control algorithm is the core of the vehicle tractioncontrol system. This paper analyzes the relationship between the road friction estimation andtraction control system, as well as the slip-rate, and also appropriates a choice of controlstrategy describes the theoretical principles of traction control and the specific controlalgorithm, then gives a feasible way to determine the road friction estimation. Next, I edit themodel and programming simulations in the MATLAB/Simulink environment, after that, Igenerate a “.DLL” file which is able to use in the CRUISE software. The CRUISE softwarehas great power on simulation; it can simulate the actual operation command. Therefore, Icreate a simulation platform in the CRUISE software which build a car’s tractioncontrol model in this paper, connect the bus, and utilize the control strategy to implementsimulation control model. The simulation results show that the traction control algorithm andthe road recognition approach is reasonable, and the control methods can be effectivelyimplemented.The content of this article provides a reference for the wheel motor traction control.