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System for detecting hydroplaning of vehicle

  • US 5,481,455 A
  • Filed: 10/14/1992
  • Issued: 01/02/1996
  • Est. Priority Date: 10/17/1991
  • Status: Expired due to Term
First Claim
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1. A hydroplaning condition detecting system for a vehicle comprising:

  • an undriven wheel speed sensor for sensing rotation of an undriven wheel of the vehicle and producing an undriven wheel speed signal representing a sensed undriven wheel speed;

    a filtering means for generating a signal representing a filtered undriven wheel speed by subjecting said undriven wheel speed signal to an action of a low-pass filter with a predetermined cutoff frequency; and

    a condition detecting means for determining a difference resulting from subtraction from said filtered undriven wheel speed of said sensed undriven wheel speed, and generating a hydroplaning detection signal indicative of occurrence of a hydroplaning condition when said difference is equal to or greater than a predetermined value.

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