Design And Research Of Hydraulic Active Stabilizer Bar System

For the study of the impact of the hydraulic active stabilizer bar(ASB)system to vehicle roll stability under high speed steering maneuver,ASB control algorithms,HIL(hardware in the loop)experiment platform,and the control system were designed for this project.The control algorithm was designed with two parts based on the vehicle roll dynamics model.The high level controller was designed with ’PID+feedforward’ algorithm to calculate the anti-roll torque with the control target of the vehicle roll angle.The low level controller was used to control the actuator(hydraulic cylinder)to output the anti-roll torque.For this system,two control algorithms were developed for the low level controller respectively:BangBang controller with the control target of push rod displacement and PID controller with the control target of oil pressure.For the further research of the ASB system,the HIL experiment platform was built based on dSPACE and the hardware circuit of the control system was designed with the 16 bits micro-controller MC9S12DG128 as core.Finally,completed the HIL experiment under the conditions of typical vehicle speed,road condition,and steering maneuver to analyze the effect of the control algorithms to vehicle roll stabilityThe results illustrated that the high level controller could calculate the anti-roll torque according to the lateral acceleration and vehicle roll angle effectively.The low level controller which runs the BangBang control algorithm could improve the vehicle dynamics response and increase the vehicle roll stability obviously with the coordinating of high level controller,and works better than the PID control algorithm.