This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Multi-mode controller design for active seat suspension with energy-harvesting
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
In this paper, a multi-mode active seat suspension with a single actuator is proposed and built. A one-DOF seat suspension system is modeled based on a quarter of commercial vehicle model with a DC motor and a gear reducer as the actuator. Aiming at improving ride comfort and reducing energy consumption, a multi-mode controller is presented. According to the seat vertical acceleration and suspension dynamic travel signals, control strategies switch among three modes: active drive mode, energy harvesting mode and plug breaking mode. In active drive mode, the DC motor works in the driving state and its output torque which calculated by LQR algorithm is controlled by a current-loop controller; in energy harvesting mode, the DC motor works in the generator state by which induced current can charge the power source, in this mode, the DC motor is considered as a damper which damping coefficient is decided by the charging current and controlled by Skyhook algorithm; in plug breaking mode, the DC motor works in the plug breaking state and its inverse voltage reaches to maximum to stop the suspension movement quickly. Simulations are carried out with random road and triangle block as the road excitation. Based on the simulation model, this active seat suspension prototype is built with which Rapid Control Prototyping (RCP) experiments are taken. Both the simulation and experiment results show that the multi-mode control strategy can improves the ride comfort compared with passive seat suspension and effectively reduces energy consumption compared with fully active control strategy meanwhile.