Abstract
Active suspension has not been popularized for high energy consumption. To address this issue, this paper introduces the concept of a new kind of suspension. The linear motor is considered to be integrated into an adjustable shock absorber to form the hybrid active semiactive suspension (HASAS). To realize the superiority of HASAS, its energy consumption and regeneration mechanisms are revealed. And the system controller which is composed of linear quadratic regulator (LQR) controller, mode decision and switch controller, and the sliding mode control based thrust controller is developed. LQR controller is designed to maintain the suspension control objectives, while mode decision and switch controller decides the optimal damping level to tune motor thrust. The thrust controller ensures motor thrust tracking. An adjustable shock absorber with three regulating levels to be used in HASAS is trial produced and tested to obtain its working characteristics. Finally, simulation analysis is made with the experimental three damping characteristics. The impacts of adjustable damping on the motor force and energy consumption are investigated. Simulation results demonstrate the advantages of HASAS in energy conservation with various suspension control objectives. Even self-powered active control and energy regenerated to the power source can be realized.
Highlights
Active suspension can coordinate the trade-off between ride comfort and handling performance according to the control targets and improve suspension dynamic performance significantly
This paper proposes the concept of hybrid active semiactive suspension (HASAS) by integrating the adjustable shock absorber with a linear motor
Energy conservation of HASAS for ride comfort objective cannot be achieved compared to the active suspension with random road excitation, HASAS is superior for handing and trade-off objectives
Summary
Active suspension can coordinate the trade-off between ride comfort and handling performance according to the control targets and improve suspension dynamic performance significantly. Considering that the linear electromagnetic actuator has been priority selection in the vehicle suspension system for fast response, compact structure, and linear motion without motion transformation mechanism, this paper integrates linear motor into the adjustable shock absorber paralleled with a coil spring and proposes the concept of HASAS with three regulating damping levels. Such suspension system is rarely reported in the existing literatures.
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