Longitudinal Motion Control Of A4In-Wheel Drive Electric Vehicle

One remarkable merit of electric vehicles is the excellent performance and controllability of their electric motors. In comparison to conventional propulsion systems the main advantages of electric motors can be described by quicker and more accurate torque generation, the output torque is easier comprehensible and electric motors can be constructed small enough to be attached to each wheel. Referring to that, in‐wheel motors have enormous potential to create an advanced all‐wheel drive system especially with regard to driving performance and safety. This thesis investigates a new traction control approach for a four in‐wheel driven electric vehicle. Thereby a model is developed using MATLAB/Simulink for simulating the longitudinal dynamics being at work at a four‐wheel drive vehicle. In order to control the slip ratio at the four wheels a controls algorithm is applied based on maximum transmissible torque estimation. Finally results are presented illustrating the performance of the control approach for different kind of scenarios.