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Method and apparatus for judging road surface conditions and program for judging road surface conditions

  • US 7,389,170 B2
  • Filed: 11/12/2003
  • Issued: 06/17/2008
  • Est. Priority Date: 11/13/2002
  • Status: Expired due to Fees
First Claim
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1. A method for judging road surface conditions on which a four-wheel-drive vehicle is running, comprising the steps of:

  • obtaining wheel speed rotational information of driving wheels of the four-wheel-drive vehicle during running from wheel speed detecting means,receiving GPS radio waves to calculate positional information of the four-wheel-drive vehicle,calculating velocity and acceleration of the vehicle from the positional information,calculating a slip rate of the wheels of the vehicle from the wheel speed information and velocity of the vehicle,calculating a linear relationship between vehicle acceleration and the slip rate,judging road surface conditions during running from a gradient of the linear relationship, andproviding an output of the road surface conditions.

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