The peak slip coefficient corresponds to the wheel slip rate
We know that the number of direct factors moving forward is related to ground friction, and when the friction is too small and the drive force is large, the car will slip. There is a proportional relationship between them is the adhesion coefficient. The attachment coefficient of the road is greatly changed by the wheel structure, material, road surface shape, material and the nature of the road. The general dry and clean leveling cement, asphalt pavement (called good road) longitudinal peak adhesion coefficient is as high as 0.8 ~ 0.9, While the vertical peak of ice and snow surface adhesion coefficient as low as 0.1 to 0.2. The maximum value of the adhesion coefficient is the peak adhesion coefficient, and the adhesion coefficient when the car is locked is called the sliding adhesion coefficient. Usually the sliding adhesion coefficient is 15% ~ 20% less than the peak adhesion coefficient. The lateral adhesion coefficient is basically the same as the slip rate (the slip ratio is the proportion of the sliding component in the wheel movement, in order to obtain the best braking effect, To control its slip rate in the range of 15% to 20%) increase and monotonically decline, when the slip rate of 100% when the wheel is fully locked drag, the lateral slip coefficient is zero, said the wheel at this time completely lost Resistance to lateral force, if the lateral force on the wheel, can only cause the side slip, can not turn, then the car lost steering maneuverability, which is very dangerous.
