scholarly journals A Quarter-Car Suspension System: Car Body Mass Estimator and Sliding Mode Control

2013 ◽  
Vol 7 ◽  
pp. 208-214 ◽  
Author(s):  
Ervin Alvarez-Sánchez
Keyword(s):  
Sliding Mode Control ◽  
Body Mass ◽  
Sliding Mode ◽  
Suspension System ◽  
Car Body ◽  
Mode Control ◽  
Car Suspension ◽  
Quarter Car

A sliding mode controller for vehicle active suspension systems with non-linearities

1998 ◽  
Vol 212 (2) ◽  
pp. 79-92 ◽  
Author(s):  
C Kim ◽  
P I Ro
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Active Suspension ◽  
Suspension System ◽  
Operating Conditions ◽  
Normal Operation ◽  
Sliding Mode Controller ◽  
Mode Control ◽  
Control Scheme ◽  
Quarter Car

In this paper, the control of an active suspension system using a quarter car model has been investigated. Due to the presence of non-linearities such as a hardening spring, a quadratic damping force and the ‘tyre lift-off’ phenomenon in a real suspension system, it is very difficult to achieve desired performance using linear control techniques. To ensure robustness for a wide range of operating conditions, a sliding mode controller has been designed and compared with an existing nonlinear adaptive control scheme in the literature. The sliding mode scheme utilizes a variant of a sky-hook damper system as a reference model which does not require real-time measurement of road input. The robustness of the scheme is investigated through computer simulation, and the efficacy of the scheme is shown both in time and frequency domains. In particular, when the vertical load to the sprung mass is changed, the sliding mode control resumes normal operation faster than the nonlinear self-tuning control and the passive system by factors of 3 and 6, respectively, and suspension deflection is kept to a minimum. Other results showed advantages of the sliding mode control scheme in a quarter car system with realistic non-linearities.

Design and analysis of an integrated sliding mode control–two-point wheelbase preview strategy for a semi-active air suspension with stepper motor-driven gas-filled adjustable shock absorber

2018 ◽  
Vol 232 (9) ◽  
pp. 1194-1211 ◽  
Author(s):  
Jing Zhao ◽  
Pak Kin Wong ◽  
Xinbo Ma ◽  
Zhengchao Xie
Keyword(s):  
Sliding Mode Control ◽  
Shock Absorber ◽  
Sliding Mode ◽  
Single Point ◽  
Rear Wheel ◽  
Suspension System ◽  
Stepper Motor ◽  
Damping Force ◽  
Mode Control ◽  
Air Suspension

This article proposes an integrated sliding mode control–two-point wheelbase preview strategy for semi-active air suspension system with gas-filled adjustable shock absorber. First of all, a vehicle suspension model with rolling lobe air spring and gas-filled adjustable shock absorber is built, following with a road input model for the front wheel. By describing the detailed structure and working process of the gas-filled adjustable shock absorber, the regulating mechanism between the stepper motor and the designed gas-filled adjustable shock absorber is established. Subsequently, the sliding mode control algorithm is applied to generate the desired damping force with the real-time state of the vehicle. Moreover, to predetermine the road profile for the rear wheel, a two-point wheelbase preview approach is proposed and its superiority is also illustrated as compared with the conventional single-point wheelbase preview approach. To evaluate the performance of the proposed system, numerical analysis is conducted with other three comparative schemes, namely, passive suspension system, active suspension system with H infinity control, and sliding mode control–controlled semi-active air suspension system with adjustable shock absorber. Simulation results show that the integrated sliding mode control–two-point wheelbase preview strategy can be successfully utilized in the semi-active air suspension system with stepper motor-driven gas-filled adjustable shock absorber, and the vehicle performance with the proposed system can be greatly improved.

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