Symmetry Control of Comfortable Vehicle Suspension Based on H∞

Abstract

Suspension is an important part of intelligent and safe transportation; it is the balance point between the comfort and handling stability of a vehicle under intelligent traffic conditions. In this study, a control method of left-right symmetry of air suspension based on H∞ theory was proposed, which was verified under intelligent traffic conditions. First, the control stability caused by the active suspension control system running on uneven roads needs to be ensured. To address this issue, a 1/4 vehicle active suspension model was established, and the vertical acceleration of the vehicle body was applied as the main index of ride comfort. H∞ performance constraint output indicators of the controller contained the tire dynamic load, suspension dynamic stroke, and actuator control force limit. Based on the Lyapunov stability theory, an output feedback control law with H∞-guaranteed performance was proposed to constrain multiple targets. This way, the control problem was transformed into a solution to the Riccati equation. The simulation results showed that when dealing with general road disturbances, the proposed control strategy can reduce the vehicle body acceleration by about 20% and meet the requirements of an ultimate suspension dynamic deflection of 0.08 m and a dynamic tire load of 1500 N. Using this symmetrical control method can significantly improve the ride comfort and driving stability of a vehicle under intelligent traffic conditions.

Performance Improvement of a Vehicle Equipped with Active Aerodynamic Surfaces Using Anti-Jerk Preview Control Strategy

“…The simulation results for suspension deflection shows that for the proposed AJPC strategy, suspension deflection is within the allowable space 0.08 m range, as defined by [ 48 ]. Moreover, the suspension deflection for OPC is more than the allowable space.…”

Effect of Quenching Medium and Tempering Temperature on Microstructure and Hardness of JIS SUP 9 Steel

“…In the automotive world, it is necessary to pay attention to comfort and safety in terms of driving when choosing which vehicle to use apart from the design and acceleration aspects. To support this, a good suspension system is needed so that comfort and safety in terms of driving can be obtained perfectly (Hou, J. et al 2022). The system is made of spring and damper steel components which are located between the wheels and the vehicle body.…”

Adaptive sliding mode-based active disturbance rejection control for vehicle suspension control

“…A radial basis function neural network (NN) control 10 and a robust adaptive control method using backstepping and NN identification 11 are proposed for the control of a quarter car ASS. Hon et al 12 proposed a control method based on H ∞ and verified the scheme under various traffic conditions. A robust controller design for ASS based on unified μ -synthesis framework is designed by Jin et al 13 and Gopi et al 14 In the work of Abboudi et al, 15 an observer-based fault tolerant predictive control is investigated for a quarter car suspension model under sensor faults.…”