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Road surface friction measuring method and device therefor

  • US 6,427,519 B2
  • Filed: 12/20/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 12/24/1999
  • Status: Expired due to Fees
First Claim
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1. A road surface friction coefficient measuring method, comprising the steps of:

  • providing a measuring wheel on the lateral outside of the traveling wheel of a car via a support arm provided oscillatably about the axis line of said traveling wheel;

    generating frictional force of said measuring wheel to the ground surface by rotatably driving said measuring wheel so as to have a prescribed difference in circumferential velocity with said traveling wheel;

    generating a vertical load to be added to the self weight of said measuring wheel by applying a prescribed vertical load to said measuring wheel; and

    measuring said frictional force and said vertical load and calculating the road surface friction coefficient based on said measured values.

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