Abstract
Developing and constantly changing technologies, efforts to achieve maximum efficiency with minimum fuel consumption, as well as the development of comfort and safety systems, have become very essential topic in car manufacturing and design. Whereas comfort and security were not given a high importance in the first produced cars, they are indispensable elements of today's automobiles. Since public transportation uses road in large scale, the need for safety and repose is also increasing. Nowadays, vehicles have better security and comfort systems, which react very quickly to all kinds of loads and different cases of driving (braking, acceleration, high speed, cornering), where the tires can keep the road at its best, utilizing an advanced suspension system. In this study, a quarter-car model was fulfilled using LabVIEW (Laboratory Virtual Instrumentation Engineering Workbench) software. The control of this model has been realized by applying two different controllers. PID (proportional, integral, derivative) controller which is a common and conventional control method and the Fuzzy Logic controller which is considered as an expert system that is becoming more and more widely used. In both control approaches, controlling the suspension system was achieved successfully. However; It has been determined that controlling the system using Fuzzy Logic controller gave better dynamic response than applying the PID controller for the quarter car suspension model that has been used in the direction of this study.
Highlights
IntroductionForce distribution: Proper tire and road contact must be provided on all four wheels to ensure a good roadholding and handling
Force distribution: Proper tire and road contact must be provided on all four wheels to ensure a good roadholding and handling.These features overlap each other according to the road and vehicle situation, therefor, traditional suspension systems cannot provide all these features
LabVIEW (Laboratory Virtual Instrumentation Engineering Workbench) allows modelling of systems that can be expressed as mathematical equations using block diagrams
Summary
Force distribution: Proper tire and road contact must be provided on all four wheels to ensure a good roadholding and handling These features overlap each other according to the road and vehicle situation, therefor, traditional suspension systems cannot provide all these features. A design that reduces the sideways tilt of the torso, for instance, will have too much stiffness, which cause the vibrations from the road to be transmitted to the vehicle body. This can be shown on the quarter car model in which the single wheel is considered. Note that the resonance amplitudes of the body and the wheel increase while the gain at high frequencies decreases. The control of the side tilt of the nose and the rear part will be a function of the interaction between each suspension [1]
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