×

Method for determining the coefficient of friction between a vehicle tire and a roadway

  • US 4,779,447 A
  • Filed: 05/28/1987
  • Issued: 10/25/1988
  • Est. Priority Date: 05/07/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A mehod for determining the coefficient of friction between a vehicle tire and a roadway comprising:

  • (a) pressurizing during normal brake operation one of the vehicle wheels at a higher brake pressure than another wheel,(b) comparing the rotational speed of said one wheel with the rotational speed of the other wheel for determining the wheel slip of said one wheel from the difference in the rotational speeds of the other wheel and said one wheel when the pressure on said one wheel reaches a value indicative of a predetermined braking torque on said one wheel;

    (c) measuring the axle load on said one wheel; and

    (d) determining the coefficient of friction between the tire of said one wheel and said roadway from said measured axle load, said predetermined braking torque, and the inverse proportion of said determined wheel slip.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×