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Design of a fuzzy logic controller for a semi-active vehicle suspension

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Abstract: This paper presents the application of fuzzy logic 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. 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.
The aim of a vehicle suspension is to provide an isolation of a vehicle body from road irregularities and to ensure good road holding. The first goal lies within the area of ride analysis and concerns a problem of how to reduce a discomfort experienced by vehicle occupants. The second one lies within the area of handling analysis. Here, the handling means an ability of a vehicle to safely accelerate, brake and corner with the “ease-of-use”.
The design goal is to minimize both the acceleration of the body and the dynamic tire load, while operating within the constraints of suspension rattle space for a given suspension parameter set.
One way to improve the ride quality and the safety level is to adjust suspension parameters to a weight of car and its load, and also to a type of road excitation. There are two elements of a suspension having influence on its performance - a spring element and a damper. In case of a passive suspension a designer has to assume the most frequent
conditions of driving and find the best suspension stiffness and damping for these conditions. In general, it is the problem of suspension optimization.
Using spring elements of a variable stiffness and damping elements of a variable damping ratio, a suspension is able to adapt to various driving conditions.
As in case of a passive suspension the designer has to find an optimal parameter set for the spring and the damper to reach the trade-off between comfort and safety, in case of a suspension with variable stiffness and damping he can define an area of a compromise (not just single values for both stiffness and damping). (...)

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Źródło: Czasopismo Logistyka

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