Study On Joint Control Of Direct Yaw Control System And Active Suspension System For Electric Vehicles

With the increase of car ownership and popularity in family life,the demands of car’s ride experience and driving safety are increased.A single control system has failed to keep up with the development of the automotive industry.Today,how to realize the improvement of handling stability and comfort through chassis integrated control is a hot topic.The introduction of hub motors in electric vehicles has largely affected the stability and smoothness of automobiles.A single control system cannot solve this problem well.This paper focuses on the direct yaw moment control system and the active suspension system for wheel hub motor-driven vehicles.Firstly,in the paper builds a multi-body dynamics model of an ADAMS distributed-driving electric vehicle and compares it with a two-degree-of-freedom model,based on this model,the influence of the introduction of wheel hub motor on the stability of the vehicle is analyzed..Aiming at the problem of lateral stability under extreme conditions,a vehicle stability control system was designed.Using a stratified control structure,the upper layer was based on the sliding film control algorithm,and the yaw rate and the centroid slip angle were used as the control variables to establish a direct yaw moment control system,the lower layer distributes the additional yaw moment to the wheels on both sides in a driving manner through the Logical threshold rule allocation to realize the correction of the vehicle trajectory and improve the steering stability.For the ride comfort problem,based on the fuzzy control algorithm,the Active Suspension System(ASS)controller(including the vertical motion controller and the roll controller)was set up with the vertical angular velocity and the roll angle as the control variables,and adjust the output weight of the two controllers through the coordination controller.In order to improve the stability and comfort at the same time,DYC and ASS are jointly controlled to improve the smoothness of the car under the premise of ensuring stability.Finally,an Adams/Simulink co-simulation platform was built to verify the control system.Through the joint simulation experiment of Matlab/Simulink and Adams,the results show that through the joint control of DYC and ASS,the lateral stability of the car is solved under the extreme working conditions.At the same time,the ride comfort of thecar is improved and the comprehensive vehicle is enhanced.