Event-triggered H∞ control of semi-active quasi-zero stiffness air suspension system for commercial vehicles

Abstract

In this paper, an event-triggered [Formula: see text] control strategy is proposed for a novel quasi-zero stiffness semi-active air suspension (QZS-AS) system. The QZS-AS system consists of a quasi-zero isolator and magnetorheological dampers. The quasi-zero stiffness structure is composed of an air spring and a pneumatic actuator-cylinder. Compared with normal air suspension system, QZS-AS can achieve much lower natural frequency and better vibration isolation performance. In order to further enhance the vibration isolation performance of the QZS-AS system, semi-active robust control for nonlinear QZS-AS system is performed by adjusting the current of the magnetorheological damper. An event-triggered damping controller is introduced in the QZS-AS system to save the communication resources. Model-in-the-loop test and hardware-in-the-loop (HiL) test are conducted to verify the performance of proposed strategy. It is demonstrated that the event-triggered [Formula: see text] control is able to provide a similar performance as traditional time-triggered [Formula: see text] control while saving about 50% of the communication resources.