1. Friction Coefficient
is the ratio of adhesion to the adhesion coefficient wheel normal direction (a direction perpendicular to the road surface) pressure. It can be viewed as the static friction coefficient between the tire and the road surface. The larger the coefficient, the greater the available adhesion, the less slippery car. Adhesion coefficient magnitude, depending on the kind of road conditions and dried, and the tire structure and the tread pattern have a relationship, and the traveling speed. Generally, dry, asphalt or concrete pavement maximum adhesion coefficient, a 0.8 up to 0.7. And snowy road adhesion coefficient minimum, most likely to slip.
refers to the adhesion coefficient of traction capability of the tire at the road surface of different sizes, it is roughly equivalent to the coefficient of friction. High adhesion coefficient road, the car is not easy to slip, with security; low adhesion coefficient of the road surface, slippery car, such as snow, ice and the like.
attachment coefficient depends on the degree of roughness and muddy and wet road surface, the tire tread and pressure loads and the vehicle speed and the like.