Abstract
To effectively improve the vehicle suspension dynamic performances, minimizing discomfort of passengers and realize vibration energy recovery, a new kind of electromagnetic hybrid suspension (EMHS) system with parallel structure of linear motor and solenoid valve shock absorber is put forward. The linear motor actuator can work at the active state for active control or energy-regenerative state for energy recovery, the solenoid valve shock absorber work at the semi-active state for damping control. Firstly, for the analysis of the hybrid suspension, a quarter dynamic model of EMHS is established. Meanwhile, the mathematical models of linear motor actuator and solenoid valve shock absorber are founded, respectively. Then, for the better suspension control effect based on fuzzy control strategy, a novel endocrine composite fuzzy control strategy is designed. By learning the biological endocrine hormone regulation mechanism, the endocrine control with long feedback and ultra-short feedback is designed. The control laws of the fuzzy controller and endocrine controller are, respectively, designed. Finally, the simulation analysis of suspension dynamic performances and energy-regenerative characteristics is done, respectively. At the same time, the bench test is carried out based on the rapid control prototype with dSPACE platform. The results show the control effect of endocrine composite fuzzy control is better than that of fuzzy control, which improves the dynamic performances. Moreover, part of vibration energy is recovered.
Highlights
The suspension of a vehicle acts as a significant role in minimizing the shocks and vibration from the road excitation
The road condition is better under the economy mode, the solenoid valve shock absorber works in the semi-active state, outputs adjustable damping force to attenuate vibration, and the linear motor actuator works in the energy-regenerative state for energy recovery
When the solenoid valve shock absorber works in the semi-active state, the ideal force is obtained by the endocrine composite fuzzy control strategy of the suspension controller, the actual damping force is generated by the controllable current input according to the ideal force
Summary
The suspension of a vehicle acts as a significant role in minimizing the shocks and vibration from the road excitation. Many scholars proposed the hybrid suspension systems with hybrid actuator structure, which can work at different modes to coordinate the contradictions between dynamic performance and energy consumption. The comparative simulation verification was carried out, the results show that the negative effect of vertical vibration of hub motor can be effectively reduced, by the nonlinear optimal sliding mode fuzzy control of the active shock absorber in the electric wheel, which can ensure the better overall smoothness performances of the electric vehicle. The above research shows that endocrine control has good self-learning and adaptive performance in control engineering, while fuzzy control strategy needs this to achieve better control effect. The proposed EMHS actuator structure can work in different states, so as to recover vibration energy, while ensuring vehicle suspension dynamic performance.
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