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Method for detecting decrease of tire air pressure and apparatus used therefor

  • US 5,900,543 A
  • Filed: 04/10/1997
  • Issued: 05/04/1999
  • Est. Priority Date: 04/15/1996
  • Status: Expired due to Term
First Claim
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1. A method for detecting decrease of tire air pressure comprising the steps of:

  • moving a vehicle having four wheels at a velocity;

    detecting the velocity of the vehicle;

    calculating angular velocity for each wheel simultaneously;

    calculating a first pressure judgement value based on angular velocity of all the wheels;

    activating an alarm when the first pressure judgement value is greater than a predetermined pressure judgement value;

    calculating a second pressure judgement value based on an average vehicle velocity when the velocity and an acceleration of the vehicle are greater than a predetermined vehicle velocity value and a predetermined vehicle acceleration value; and

    activating the alarm when the second pressure judgement value is greater than the predetermined pressure judgement value.

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