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This study concerns a dynamic vertical quarter model of a passenger bus using an innovative air suspension system. A PID controller is designed to adjust the air spring element’s stiffness through pressure modulation. The air suspension system on the vehicle model is compared to traditional leaf spring with alterations in stiffness. The investigation reveals compelling results, showcasing the remarkable improvements achieved by the proposed model and controller. Specifically, the observation makes a remarkable 87.1% reduction in sprung mass acceleration and a substantial 76.6% decrease in displacement, while the variable that characterizes the safety of movement of the vehicle is the displacement of the suspended mass, which is reduced by about 80%. These results underscore the potential for enhanced road holding and ride comfort through advanced air suspension control strategies.

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PID Controller Design for an Active Air Suspension System on Passenger Bus

  • 会议论文

  • 发表日期：

    2026年

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  • Trong Tu Do,
  • Van Tan Vu,
  • Olivier Sename,
  • Peter Gaspar

摘要

This study concerns a dynamic vertical quarter model of a passenger bus using an innovative air suspension system. A PID controller is designed to adjust the air spring element’s stiffness through pressure modulation. The air suspension system on the vehicle model is compared to traditional leaf spring with alterations in stiffness. The investigation reveals compelling results, showcasing the remarkable improvements achieved by the proposed model and controller. Specifically, the observation makes a remarkable 87.1% reduction in sprung mass acceleration and a substantial 76.6% decrease in displacement, while the variable that characterizes the safety of movement of the vehicle is the displacement of the suspended mass, which is reduced by about 80%. These results underscore the potential for enhanced road holding and ride comfort through advanced air suspension control strategies.