×

Method of detecting a deflated tire on a vehicle

  • US 5,239,469 A
  • Filed: 01/28/1991
  • Issued: 08/24/1993
  • Est. Priority Date: 02/09/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of detecting a partially deflated pneumatic tire on a vehicle having four tires each mounted on a wheel comprising the steps of:

  • (a) sensing the angular velocity of each wheel and producing four signals proportional thereto;

    (b) processing the four signals in a processing unit which subtracts a first sum of the signals from one pair of diagonally opposite wheels from a second sum of the signals from the other pair of diagonally opposite wheels;

    (c) sensing when the magnitude of the result of the processing at said step (b) is between 0.05% and 0.6% of the mean of said first and second sums to produce a signal factor; and

    (d) operating a warning device, when said signal factor is present, to indicate a tire is partially or completely deflated, wherein the angular velocity of each wheel is measured simultaneously by a pulse generator providing a digital signal of more than twenty pulses per revolution of the wheel, the angular velocities derived from the single pulse signals being interpolated to provide the angular velocity of each wheel at the same instant, and a second signal of a single pulse per revolution of the wheel and the two angular velocity signals are both used.

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