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Apparatus and method for alarming decrease in tire air-pressure

  • US 6,407,661 B2
  • Filed: 04/11/2001
  • Issued: 06/18/2002
  • Est. Priority Date: 04/11/2000
  • Status: Active Grant
First Claim
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1. An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle, comprising:

  • rotational information detecting means for detecting a rotational information of each of the tires;

    memory means for storing the rotational information of each of the tires;

    calculation processing means for calculating a reciprocal number of a turning radius from the rotational information of the tires attached to a driving shaft among the rotational information of the respective tires and calculating a judged value from the rotational information of the respective tires;

    first judging means for comparing the judged value with a reference value at every regions of the turning radius on the basis of a relation between the reciprocal number of the turning radius and the judged valve so as to judge decrease in internal pressure; and

    second judging means for canceling a judgement of decrease of internal pressure when a difference between the judged value in the right turning region and the judged value in the left turning region is different from a difference between a reference judged value in the right turning region and a reference judged value in the left turning region which are obtained at a time of initializing run.

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