Chapter 8 – Applications of transient tyre models

Publisher Summary The chapter discusses the application of single contact point transient tire models. The applications demonstrate the effect of the tire relaxation length on the vehicle dynamic behavior. The actual control algorithms of the antilock braking simulation (ABS) devices marketed by manufacturers can be quite complex and are proprietary items that incorporate several practical considerations. However, almost all algorithms make use of raw data pertaining to the angular speed and acceleration of the wheels. The salient features of the criteria used to increase or decrease applied brake torque (pressure) during a braking cycle depend critically on both the momentary and threshold values of Ω. The brake torque rate can be controlled at three different levels. To simulate the braking maneuver of a quarter vehicle equipped with the ABS, the deceleration of the vehicle is taken to be proportional to Fx. The results of the simulation show that brake slip variations occur both on flat as well as on undulated road surfaces.