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Skyhook and fuzzy logic controller of a semi active vehicle suspension

This paper presents the application of on-off skyhook and fuzzy logic skyhook based controller to control semi-active suspension. Investigations were made with a use of a non-linear quarter car suspension model with characteristics of a real semi-active shock absorber with a bypass valve. The other parameters of the model were estimated on a vehicle equipped with this type of shock absorbers and reduced to a quarter car model parameters. The simulation results of the suspension dynamics were compared with the measurements results of the real suspension dynamics controlled with the same skyhook controller as the model. Authors compared a performance of three models: a passive model, a skyhook strategy controlled model, and a fuzzy logic skyhook based controlled model. The results showed that fuzzy control gives a potential for improvement of suspension operation and much greater opportunities of control strategy construction in a comparison to the classical two state skyhook control strategy.