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Method of detecting a deflated tire on a vehicle

  • US 4,876,528 A
  • Filed: 05/13/1988
  • Issued: 10/24/1989
  • Est. Priority Date: 05/13/1987
  • Status: Expired due to Term
First Claim
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1. A method of detecting a partially deflated pneumatic tire on a vehicle having four tires, each mounted on a wheel, which comprisessensing the angular velocity of each wheel and producing a signal proportional thereto,processing the four signals in a processor unit which subtracts the sum of the signals from one pair of diagonally opposite wheels from the sum of the signals from the other pair of diagonally opposite wheels,sensing when the magnitude of the result is between 0.05% and 0.60% of the mean of the sums,comparing the signals for each of the four wheels in turn with the signals for each of the other wheels,sensing when one of said signals is different from the average of all four signals by more than 0.1%, and in the event of both sensed signal factor bring present, operates a warning device to indicate a tire is partially or complete deflated.

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