H∞-based control system and its digital implementation for the integrated tilt with active lateral secondary suspensions in high speed trains

In this paper, H_∞-based control system and its digital implementation for the integrated tilt with active lateral secondary suspensions in high speed railway vehicles are discussed, in which mixed-sensitivity H_∞ control is designed for the tilting suspension, while skyhook damping control is employed for the active lateral secondary suspensions. Compared with classical decentralized control, the proposed control system can well attenuate the strong coupling between the roll and lateral dynamic modes of the vehicle body. Particular emphasis is also on the digital implementation of the reduced order H_∞ tilt controller in an embedded control unit. Proposed digital controllers are validated via a FPGA-based Hardware-In-the-Loop system.