The great roll movement of a passenger car with air suspension system can be reduced by the active control of an anti-roll actuator. For the anti-roll movement, three concepts are developed and compared simulatively. According the simulation results, the hydropneumatic actuator is selected because of its high velocity of movement, high precision of displacement und low impulse force on the actuator. To control the movement of the actuator, four control strategies are compared with a DSH-plus simulation model of the car. The PWM (Pulse Width Modulation) method and PID controller is the best choice because of its small control error, high control speed and simple control loop. For the simulation of the whole car, a co-simulation model between DSH-plus and Matlab/-Simulink is built. The simulation results show that the roll angle of the car is reduced from 3.5 deg with the passive suspension to 0 deg with the active suspension, when the car turns with a speed at 50km/h and with an angle input at 100 deg on the steering wheel. When the car runs in the sine with dwell maneuver test with the same speed and steering angle, the roll angle can be reduced from 3.2 deg with the passive suspension to 0 deg with the active suspension. In a simple validation test, the actuator is installed only on the front axle. A pneumatic cylinder, whose left and right chambers are connected with the left and right air springs, is driven by a hydraulic cylinder, which is driven by hydraulic steering system to move left or right. So the auxiliary volumes of the left and right air springs can be changed manually. The test result shows that the roll angle of the car is reduced ca. 1.5 deg with the active actuator only on the front axle. So the active volume change of the air springs is an effective way to reduce the roll movement of the car. By car turning, this active anti-roll system acts to the better safety, stability and comfort for the car.
An active anti-roll air spring suspension system for a passenger car
Aktives Rollstabilisierungs-Luftfederaufhängungssystem für einen Personenkraftwagen
2008
8 Seiten, 8 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
An active anti-roll air spring suspension system for a passenger car
Automotive engineering | 2008
|F2008-03-001 AN ACTIVE ANTI-ROLL AIR SPRING SUSPENSION SYSTEM FOR A PASSENGER CAR
British Library Conference Proceedings | 2008
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