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Design and analysis of an intelligent controller for active geometry suspension systems

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An active geometry suspension (AGS) system is a device to optimise suspension-related factors such as toe angle and roll centre height by controlling vehicle's suspension geometry. The suspension geometry could be changed through control of suspension mounting point's position. In this paper, analysis and control of an AGS system is addressed. First, the effects of suspension geometry change on roll centre height and toe angle are studied. Then, based on an analytical approach, the improvement of the vehicle's stability and handling due to the control of suspension geometry is investigated. In the next section, an eight-degree-of-freedom handling model of a sport utility vehicle equipped with an AGS system is introduced. Finally, a self-tuning proportional-integral controller has been designed, using the fuzzy control theory, to control the actuator that changes the geometry of the suspension system. The simulation results show that an AGS system can improve the handling and stability of the vehicle.

Keywords: active geometry suspension; dynamical modelling; fuzzy control; vehicle dynamic control

Document Type: Research Article


Affiliations: 1: Automotive Engineering Department, Iran University of Science and Technology, Narmak, Tehran, Iran 2: Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, ON, Canada

Publication date: January 1, 2011


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