Abstract:Due to the mutual restricted problem among comfort, safety, energy-regeneration in single control mode, the hybrid suspension with four working modes was designed and the switching strategy based on model reference was generated to control linear motor and adjustable damping to switch. Comfort model, safe model, combine model and passive energy recycle model were proposed to solve the above problems. And the body acceleration and tire dynamic displacement were used as the threshold of these four switching modes. In this system, the hybrid suspension with linear motor and three stages adjustable damping was taken as the research object. First of all, control strategies in different modes were changed through the use of multi-mode switching to improve the control effect. Then in order to reduce energy consumption and recover energy, the appropriate damping values in different modes were selected and the linear motor was used as a generator. And based on Simulink/Stateflow, the switching control system of 1/4 hybrid suspension was designed and simulated, and a complete simulation process from road switching, mode selection, mode switching to the changing of suspension model parameters was constructed. And a rapid prototype experiment was carried out. The experimental study on dynamic performance and energy feedback capability of hybrid suspension was based on dSPACE development model. The corresponding control strategy was designed and the results indicated that the root mean square value of the body acceleration and the root mean square value of the tire dynamic displacement were compared with the simulation results. Multi-mode switching control model of the hybrid suspension can effectively switch and reach the switching target, help hybrid suspension with energy recovery and improve the comprehensive performance of the hybrid suspension.
