To improve the reliability of active electromagnetic suspension and reduce energy consumption, a hybrid electromagnetic suspension that consists of linear motor and passive damper in parallel is proposed in this paper. First, a dynamic model is established and passive energy regeneration and active control systems are built. Thereafter, energy regeneration, ride comfort, and driving safety are taken as control objects. The effect of damping values on different control objects are studied, and the best values are determined. Passive suspension is taken for comparison, and comparative simulation analysis is conducted. Finally, a bench test of 1/4 suspension is performed to verify the accuracy of the simulation results.
This study proposes a modified energy-saving skyhook consisting of active control, energy regeneration, and switch. The modified skyhook coordinates the contradiction between dynamic performance and energy consumption of electromagnetic active suspension. The control principle is analyzed, the switch condition between active control and energy recovery is provided, and the switch control system is designed for simulation. Results demonstrate that the presented strategy can coordinate the dynamic performance and energy consumption effectively. The realization structure, namely, a hybrid electromagnetic actuator, is then designed to satisfy the control requirements. It integrates a linear motor and a hydraulic damper. The linear motor is used for active control or energy regeneration, while the hydraulic damper is used to guarantee basic dynamic performance. The structural dimension of hybrid electromagnetic actuator is optimized to increase air gap flux density with the volume and weight limitation. A prototype is fabricated, and a bench test is conducted. Results show that the structure can satisfy the control requirements. Some errors within a reasonable range are also observed between the test and the simulation because the simulation model is prepared under ideal conditions.
A type of hybrid electromagnetic suspension is proposed in this study to improve the reliability of a conventional active electromagnetic suspension. A motor with the proposed hybrid electromagnetic suspension linear can regenerate the vibration energy; the coordination relationship between the energy regeneration and the vibration isolation of the hybrid electromagnetic suspension is studied. A dynamic model is established, and a modified skyhook control strategy is designed. A passive energy regeneration control system and an active control system are developed. The effect of the damping on the energy regeneration and the vibration isolation is discussed. The best damping, which can consider the energy regeneration and the vibration isolation simultaneously, is determined. Comparative simulations of a passive suspension, a hybrid electromagnetic suspension and an active electromagnetic suspension are carried out, and the results verify the effectiveness of the control strategy. Finally, an energy regeneration experiment and an isolation comparative experiment of a quarter-suspension are conducted. The findings show that the hybrid electromagnetic suspension with a modified skyhook control strategy can efficiently facilitate coordination between the energy regeneration and the vibration isolation.
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