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Road surface condition determination system for automotive vehicles and anti-skid braking system having the same

  • US 6,266,602 B1
  • Filed: 02/18/2000
  • Issued: 07/24/2001
  • Est. Priority Date: 02/18/1999
  • Status: Expired due to Term
First Claim
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1. A road surface condition determination system for an automotive vehicle, comprising:

  • wheel-speed sensors detecting wheel speeds of each of road wheels; and

    a control unit being configured to be electrically connected to said wheel-speed sensors for processing a wheel-speed data signal from each of said wheel-speed sensors, said control unit comprising;

    (a) a wheel-speed fluctuation arithmetic-calculation section which calculates a wheel-speed fluctuation of each of the road wheels on the basis of a previous value of the wheel-speed data signal and a current value of the wheel-speed data signal, (b) a first absolute-value arithmetic-calculation section which calculates an absolute value of the wheel-speed fluctuation of each of the road wheels, (c) a first integration section which produces a first integrated value of the absolute values of the wheel-speed fluctuations of the road wheels, (d) a smoothing section which makes a smoothing operation to the first integrated value to produce a smoothed value, and (e) a road-surface condition determining section which determines a road surface condition on the basis of the smoothed value.

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