Research On Anti-roll Control Of New Energy Vehicle Based On Motorized Stabilizer Bar

In order to solve the problem of riding comfort,the suspension stiffness of the vehicle became smaller,which not only affects the handling stability of the vehicle,but also makes the vehicle prone to large roll or rollover when cornering at high speed.The active stabilizer bar can not only reduce the roll angle,but also ensure vehicle handling stability.The motorized stabilizer bar system has the advantages of simple structure,fast response speed and high reliability.With the continuous increase in the market share of new energy vehicles,the power consumption problem of the motor-type stabilizer bar has been gradually solved.In order to promote the application of the motor-type stabilizer bar system in new energy vehicles,this paper took the motor-type stabilizer bar system as the research object.In this paper,the vehicle roll and rollover mechanism were firstly analyzed;then,the 9-DOF vehicle dynamics model and the three-phase permanent magnet synchronous motor-type stabilizer bar actuator model were built by Simulink.The upper vehicle controller adopted the exponential sliding mode algorithm;the lower motor controller adopted the second-order super-twisting sliding mode(STSM)algorithm,and used Space Vector Pulse Width Modulation(SVPWM)to reduce the motor torque ripple and improved the dynamic response speed and system’s robustness of the stabilizer bar.The simulation results showed that compared with the traditional direct torque(DTC)control,the STSM algorithm had smaller speed ripple,torque ripple and flux ripple in the full speed domain;In the high-speed stage and the load step stage,the overshoot of the STSM algorithm was smaller,and the steady-state response time and torque response time were faster.In order to verify the performance of the upper-layer controller algorithm,a passive lateral stabilizer bar system,an upper-layer controller system based on PID algorithm and an upper-layer controller system based on exponential sliding mode control(ESMC)algorithm were built in Simulink,and the vehicle parameter model was set in Carsim software.The simulation results showed that the ESMC algorithm greatly reduced the body roll angle and made the response speed faster,and the anti-rolling moment of the front and rear axles was larger;the output power of the motor was larger than the PID algorithm.The control algorithm proposed in this paper not only makes the vehicle have better roll stability,but also has better ride comfort.However,the further real vehicles were needed to verify the performance of the algorithm.