The Interest of the Longitudinal Friction Coefficient on the Slip Ratio of the Heavy Vehicle When Braking at 60 km/h

Abstract

AbstractDuring acceleration and braking, the tires often slip relative to the road surface, which affects the acceleration and braking efficiency of the heavy vehicle. This paper indicates the research results on the slip ratio of a heavy vehicle when braking on six types of road surfaces at the velocity of 60 km/h. This paper uses the Newton–Euler method to institute a dynamics model and the Matlab-Simulink software to dissect the consequence of the maximum longitudinal friction coefficient (φxmax) on the slip ratio when braking a heavy vehicle. The outcomes show at the heavy vehicle is braked on the road surface has φxmax = [0.7, 0.8, 0.9, 1.0], the slip ratio is less than 10%, the heavy vehicle runs smoothly, the braking performance of the vehicle qualified for ECE-R13 standards; If the heavy vehicle is braked on the road surface has φxmax = 0.6, the slip ratio of the middle and rear tires are 100%, the heavy vehicle is unstable, the braking efficiency is only about 75%; If the heavy vehicle is braked on the road surface has φXmax = 0.5, the middle and rear tires slip completely, the heavy vehicle is unstable, the braking efficiency is only about 63%.KeywordsLongitudinal friction coefficientSlip ratioHeavy vehicle