Simulated results show that during straight motion braking (SMB), there is a 10% difference in the braking distances favouring the vehicle with the fuzzy logic controlled ABS. Further, the lateral stability of the vehicle with fuzzy ABS is better, because none of the wheels of the vehicle with ABS are locked or kept at high longitudinal slip ratios, making it possible for the tyres to generate forces in the lateral direction. For the case of braking and steering at the same time (B&S), the results indicate a definite improvement with the use of the fuzzy ABS. The vehicle with the fuzzy ABS stops safely in a shorter distance and also it is able to displace from its initial line of travel at an amount, which is equal to more than a lane's width. This can be increased, if desired, by tuning the fuzzy controller to aim for a smaller reference longitudinal slip at the cost of increased braking distance. Due to the present sideslip controller, the sideslip angle, beta, is kept very small. When the vehicle has to slow down on a micron-split road, the vehicle without ABS is in a dangerous situation. This vehicle immediately loses its stability giving almost no chances to the driver to counter-steer to remain on the course. This may sometimes be a more dangerous condition than actually hitting the obstacle. When it comes to the vehicle with the sideslip controlling fuzzy ABS, as soon as the driver steps on the brakes, the controller takes control of the situation and helps the vehicle stop with a smooth deceleration and a controllable and small deflection from its initial course. Due to its flexible design, this vehicle model and the fuzzy controller can be also used to study traction control and ESP with minor modifications on the present code.
A fuzzy logic controlled Anti-lock Braking System (ABS) for improved braking performance and directional stability
International Journal of Vehicle Design ; 48 , 3/4 ; 299-315
2008
17 Seiten, 10 Bilder, 2 Tabellen, 27 Quellen
Aufsatz (Zeitschrift)
Englisch
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