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Method and apparatus for alarming decrease in tire air-pressure and threshold changing program

  • US 7,301,444 B2
  • Filed: 09/09/2003
  • Issued: 11/27/2007
  • Est. Priority Date: 09/10/2002
  • Status: Active Grant
First Claim
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1. A method for alarming decrease in tire air-pressure, which detects decrease in internal pressure of a tire attached to a vehicle equipped with a navigation device including a user-operable display and accordingly issues an alarm, the method comprising the steps of:

  • detecting rotational information of the respective tires;

    storing the rotational information of the respective tires;

    displaying, on the user-operable display, a summer tire, a winter tire and a run-flat tire;

    designating a currently attached tire from among the displayed tires and switching to a threshold for judging decrease in internal pressure which matches the tire;

    judging decrease in internal pressure of a tire by using the threshold; and

    issuing the alarm on the basis of the judgment of the judging means.

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