Abstract
The rolling control of a car that focuses on reducing the roll angle passively has limited performance of increasing handling stability, passing speed, ride comfort, and rollover prevention while turning. This project presents a method for controlling an automobile to tilt toward the turning direction using active suspension. A 6-degree-of-freedom vehicle model with a 2-degree-of-freedom steering model and a 4-degree-of-freedom tilting model is established. The active tilt sliding mode controller, which causes zero steady-state tilt angle error, is established after the desired tilt angle is determined by dynamic analysis. Simulation results confirm the effectiveness of the control method. The proposed controller reduces the perceived lateral acceleration and the lateral load transfer rate, thereby effectively improving handling stability, ride comfort, and vehicle speed, meanwhile decreasing the possibility of rollover while turning.
Highlights
Traditional passive suspension (PS) prevents vehicle roll by enhancing suspension stiffness and installing a stabilizer bar but decreases vehicle ride comfort and is unable to prevent rolling and improve ride comfort simultaneously
Vehicle roll deteriorates ride comfort and handling stability and even leads to rollover when turning. These roll controls mostly focus on reducing the roll angle or causing zero roll angle at most.[9,10]
The effectiveness of these roll controls mentioned above is limited in terms of improving vehicle performance when steering
Summary
Traditional passive suspension (PS) prevents vehicle roll by enhancing suspension stiffness and installing a stabilizer bar but decreases vehicle ride comfort and is unable to prevent rolling and improve ride comfort simultaneously. A control method performs active or semi-active control by installing an actuator in series with a stabilizer bar,[1,2] and another method conducts attitude control on the vehicle body to control rolling through active or semi-active suspensions.[3,4,5,6] Active or semi-active suspensions can be used to control rollover; this control strategy is not the same as the anti-roll control when the vehicle travels normally.[7] In addition, hydraulically interconnected suspensions have a good effect on antiroll.[8] Vehicle roll deteriorates ride comfort and handling stability and even leads to rollover when turning These roll controls mostly focus on reducing the roll angle or causing zero roll angle at most.[9,10] In the case of quasi-static rollover, the rollover threshold of a rigid car without roll can be improved at most by approximately 10% compared with a normal vehicle considering suspension and tire deformation.
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