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Tire air pressure detecting device

  • US 5,553,491 A
  • Filed: 12/17/1993
  • Issued: 09/10/1996
  • Est. Priority Date: 11/11/1991
  • Status: Expired due to Fees
First Claim
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1. A tire air pressure detecting device comprising:

  • output means installed on a vehicle, for outputting a signal including a vibration frequency component of a tire while said vehicle is moving;

    deriving means for deriving gains in regard to each frequency of said vibration frequency component;

    extracting means for extracting a plurality of said gains which correspond to a predetermined frequency band;

    estimation means for estimating a resonance frequency at which a peak gain exists, based on a distribution of said plurality of gains; and

    detecting means for detecting a tire air pressure condition based on said resonance frequency having said peak gain.

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