Detc2007: proceedings of the asme international design engineering technology conference and computers and information in engineering conference, vol 4 pages:267-274
ASME International Design Engineering Technical Conferences/Computers and Information in Engineering Conference Las Vegas, NV, SEP 04-07, 2007
The main control objective of an Antilock Braking System (ABS) is to increase the tractive forces between wheel and road surface by keeping the wheel slip at the peak value of mu-lambda curve. Conventionally, it is assumed that optimal wheel slip is constant. In this paper a grey sliding mode controller is proposed to regulate optimal wheel slip depending on the vehicle forward velocity. ABS exhibits strongly nonlinear and uncertain characteristics. To overcome these difficulties, robust control methods should be employed. The concept of grey system theory, which has a certain prediction capability, offers an alternative approach to conventional control methods. The proposed controller anticipates the upcoming values of wheel slip and optimal wheel slip, and takes the necessary action to keep wheel slip at the desired value. The control algorithm is applied to a quarter vehicle model, and it is verified through simulations indicating fast convergence and good performance of the designed controller.