Multi-mode Design and Constant Current Control of Hydraulically Interconnected Energy-Regenerative Suspension

This work develops a half-car model based on hydraulically interconnected energy-regenerative suspension (HIERS) to analyze the vehicle dynamic performances and energy-regenerative characteristics under three working modes of comfort, security and energy-feedback. Also, a multi-mode control system is proposed based on the constant current control method. Taking the road excitation frequency as the multi-mode system switching threshold, a comprehensive investigation on the vehicle dynamic performances is performed. According to the simulation results, it can be found that a 10.77% decrement of body acceleration can be reached under the comfort mode compared with comprehensiveness mode. Apart from that, tire dynamic load under security mode drops by 17.43% and theoretical energy-regenerative power under energy-feedback mode increases by 19.48%. The conclusion proves that the coordinated control of HIERS dynamic performance and energy-regenerative characteristics is achieved.