Abstract
To improve the handling stability of automobiles and reduce the odds of rollover, active or semi-active suspension systems are usually used to control the roll of a vehicle. However, these kinds of control systems often take a zero-roll-angle as the control target and have a limited effect on improving the performance of the vehicle when turning. Tilt control, which actively controls the vehicle to tilt inward during a curve, greatly benefits the comprehensive performance of a vehicle when it is cornering. After analyzing the advantages and disadvantages of the tilt control strategies for narrow commuter vehicles by combining the structure and dynamic characteristics of automobiles, a direct tilt control (DTC) strategy was determined to be more suitable for automobiles. A model predictive controller for the DTC strategy was designed based on an active suspension. This allowed the reverse tilt to cause the moment generated by gravity to offset that generated by the centrifugal force, thereby significantly improving the handling stability, ride comfort, vehicle speed, and rollover prevention. The model predictive controller simultaneously tracked the desired tilt angle and yaw rate, achieving path tracking while improving the anti-rollover capability of the vehicle. Simulations of step-steering input and double-lane change maneuvers were performed. The results showed that, compared with traditional zero-roll-angle control, the proposed tilt control greatly reduced the occupant’s perceived lateral acceleration and the lateral load transfer ratio when the vehicle turned and exhibited a good path-tracking performance.
Highlights
Vehicle roll dynamics affects the handling stability and ride comfort
To verify the effectiveness of the designed controller, simulations of step-steering input and double-lane change maneuvers were performed in the MATLAB/Simulink environment
The simulation test results during both both step-steering change maneuvers showed that the controller could step-steering input inputand anddouble-lane double-lane change maneuvers showed thattilt the tilt controller perfectly track the desired tilt angle and yaw rate
Summary
Vehicle roll dynamics affects the handling stability and ride comfort. When cornering at high speeds, a vehicle is prone to excessive rolling, which can cause the vehicle to become unstable or to rollover. The traditional passive suspension has difficulty meeting the performance requirements of vehicles with suspension systems Suspension control technologies, such as active and semi-active suspensions, active lateral stabilizer bars, and hydraulic interconnected suspensions, are often used to prevent automobile rolling [1,2,3,4]. Drawing on the tilting technology used on rail trains [5], if the automobile body is tilted in the turning direction, this reverse tilt can cause the moment generated by gravity to reduce or even offset that generated by the centrifugal force. This novel technology can significantly improve the handling stability and the ride comfort. A previous study [7] indicated that on a current track line, only tilting the train at a small angle (1–2◦ )
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