Abstract
This paper is concerned with the conflicting performances of ride comfort and driving safety for semi-active suspension systems. To alleviate this conflict, a novel hybrid damping extension control (HDEC) method is proposed. This method adopts various control methods and the weights of each method are determined by extension theory. Firstly, body acceleration and tire dynamic transformation are selected to evaluate ride comfort and driving safety performance for the semi-active suspension system and their frequency responses of passive suspension, sky-hook control, ground hook control, and S-GH (sky-ground hook) control are analyzed based on a two degree-of-freedom (2-DOF) model. Secondly, extension theory is introduced and the extension control system, which contains three modes and corresponding control algorithms, is established. In addition, the low-frequency excitation and high-frequency excitation simulations are designed to determine the parameters of the extension control system. Finally, ve-DYNA vehicle suspension model simulation is applied to prove the feasibility and effectiveness of the extension control. The simulation results show that, based on the suspension state, extension control can improve the performance of ride comfort and driving safety.
Highlights
The suspension system, playing a significant role in improving ride comfort and driving safety performance of in vehicles, is divided into the sprung mass part and the unsprung mass part [1].A considerable number of studies about suspension control methods have been carried out to suppress the vibration of the sprung mass and the unsprung mass
Shi et al proposed sky-ground hook control to suppress the vibration of energy-regenerative suspension and the mode switch strategy was decided by sliding mode controller [10]
The results that thethe responses of ride ride comfort andand driving safety are compared under the passive suspension, sky-hook control, and extension control are shown are compared under the passive suspension, sky-hook control, and extension control are shown as compared under the passive suspension, sky-hook control, and extension control are shown as as Figures 21–25
Summary
The suspension system, playing a significant role in improving ride comfort and driving safety performance of in vehicles, is divided into the sprung mass part and the unsprung mass part [1]. Based on the above analysis, instead of single control methods, hybrid control approaches with intelligent switching rules are suggested to improve the vehicle comprehensive performance. Shi et al proposed sky-ground hook control to suppress the vibration of energy-regenerative suspension and the mode switch strategy was decided by sliding mode controller [10]. The establishment of the fuzzy rule base is still time and effort consuming under fuzzy control These studies focus on reducing vibration of body acceleration, which improve ride comfort performance, rather than on improving the comprehensive performance between ride comfort and driving safety. Shida Nie added a tuned mass damper in a traditional 2-DOF suspension model to eliminate the unsprung adverse effect and applied the sliding mode controller to improve ride comfort across the whole frequency spectrum for in-wheel motor-driven vehicles [32].
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