Research on Model Predictive Control for Automobile Active Tilt Based on Active Suspension

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.

Improved Rotor Flux and Torque Control Based on the Third-Order Sliding Mode Scheme Applied to the Asynchronous Generator for the Single-Rotor Wind Turbine

“…In [55], the DFTC control scheme reduced the electromagnetic torque, stator current, and rotor flux compared to the FOC method. The DFTC strategy was designed based on a model predictive controller [56]. This proposed DFTC is simpler and, in addition, reduces the torque ripple compared to the classical DFTC strategy.…”

A Study on Wear and Friction of Passenger Vehicles Control Arm Ball Joints

“…Energies 2021, 14, x FOR PEER REVIEW 2 of 29 Yao et al [5] proposed the direct tilt control (DTC) strategy allowing actively controlling the vehicle to tilt during a curve, which improved the vehicle performance during cornering. Such a control limited the occupant's felt lateral acceleration and the lateral load transfer ratio during turning of the car and allowed proper path-tracking performance.…”

“…The screw (11) and tilt arm (2) were electrically connected to the circuit containing battery (14) and control light (15). In case of contact between polished front plane of the screw (10), the roller needle (5), and the tilt arm (2), the electric circuit is closed, and then, the control light turns on. The position of the adjustment screw (11) was determined using an aligning bearing roller (12) positioned between the tilt arm (2) and support (1) in the predetermined place marked using paint.…”

“…It was fixed around the axis of its nondeformable hole (6) for the needle bearing placement. The tilt arm (2) was in frictional contact with the steel bearing needle (5), which was mating frictionally with the bottom plane of the fine threaded screw tip (4). The upper plane of the tip was fixed.…”

“…To estimate the values of the friction coefficient, a simple tester was prepared (Figure 9). It utilizes an adjustable tilting plane (2), which was mounted on a pin (5) attached to the support (1) and symmetrically positioned relative to the mean symmetry plane of the support. The upper steel surface of the tilting plane (2) was ground and polished.…”