| 摘要 |
PCT No. PCT/NO95/00206 Sec. 371 Date May 2, 1997 Sec. 102(e) Date May 2, 1997 PCT Filed Nov. 3, 1995 PCT Pub. No. WO96/14564 PCT Pub. Date May 17, 1996The friction between vehicle wheels provided with rubber tires follows three influence curves (5, 6, 8). The friction between a wheel with rubber tire and a road surface is represented by a measuring result curve (1-4) the shape of which is determined symptotically from the rubber tire influence curve (6). Thus the measuring result curve (1-4) will have a characteristic shape with maximum values (1A-4A). The maximum friction is determined by the influence curve of the rubber tire and the road surface respectively, also denoted the maximum friction influence curve (8). Each influence curve has its mathematical model. In the mathematical model for the maximum friction influence curve (8) there is incorporated a slip speed, properties of the car tire and road surface-to-car tire properties. The car tire properties and the pavement-to-car tire properties can be determined as process parameters by measurement. Then the maximum friction will be a dependent variable of the slip speed alone, as long as the properties of the car tire and the road surface-to-car tire properties are unaltered. The invention can be utilized for measuring car tires or road surfaces and for controlling traction, i.e. braking or propulsions. |
