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Method and apparatus for detecting decrease in tire air-pressure, and program for judging decompression of tire

  • US 20030140688A1
  • Filed: 01/30/2003
  • Published: 07/31/2003
  • Est. Priority Date: 01/30/2002
  • Status: Active Grant
First Claim
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1. A method for detecting decrease in tire air-pressure, which detects decrease in internal pressure of a tire on the basis of rotational information obtained from tires attached to a vehicle, the method comprising the steps of:

  • detecting rotational information of the respective tires;

    storing rotational information of the respective tires;

    detecting whether the vehicle is running on a flat road or not;

    detecting whether the vehicle is accelerating or decelerating;

    comparing rotational information of both front wheels with rotational information of both rear wheels when it has been determined that the vehicle is running on a flat road and that the vehicle is neither accelerating nor decelerating; and

    judging simultaneous decompression of both front wheel tires or simultaneous decompression of both rear wheel tires on the basis of a relationship between a value obtained through comparison of the rotational information of both front wheels and both rear wheels and a specified threshold.

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