Control Strategy Of Four-Wheel Drive Electric Vehicles Under Low-Power

With the development of electric vehicles,the four wheel electric vehicle becomes a hot spot in the field of electric vehicle because of its strong controllability.As the vehicle control technology is one of the most important technical bottlenecks that restrict the development of the four wheel hub electric vehicle,it is of great value to study the control technology of the four wheel electric vehicle.However,it is difficult to have a control strategy which can be applied to all the cases due to the possibility that the vehicle may operate in a variety of operating conditions.Therefore,this paper researches the body stability of the low battery condition,based on the research and design of a vehicle under the condition of low power control strategy,in order to ensure the running stability of four wheel electric vehicle in low power conditions.The main contents of this paper are as follows:1?The basic vector control of drive motor is studied,and the PI parameters of vector control are set up.Then,the influence of the battery SOC and the different driving load on the DC bus voltage in the process of motor vector control is studied by building the simulation model of the motor vector control.Secondly,it studies the phenomenon that the single power supply drives the DC voltage of the four motors at the same time.Finally,the influence of low power on the control stability is analyzed.2?Composition of vehicle structure of four wheel electric vehicle,and then completed the tire model,vehicle dynamics model and wheel dynamics model modeling.3?Make sure the control target of low battery case four wheel electric vehicle control strategy,design a optimal torque distribution strategy to realize the control on the stability of the vehicle under the condition of low power,and through the co simulation model is build in simulink and carsim,in different working conditions of the low power design the four wheel electric vehicle control strategy simulation.In this paper,the design of the vehicle control strategy can be very good to achieve the control objectives,to ensure that the vehicle in the case of low power vehicle stability.