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Tire pneumatic pressure detector

  • US 6,720,869 B2
  • Filed: 12/20/2001
  • Issued: 04/13/2004
  • Est. Priority Date: 01/10/2001
  • Status: Active Grant
First Claim
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1. A tire pneumatic pressure detector comprising:

  • tire pneumatic pressure detection means for detecting a tire pneumatic pressure;

    pneumatic pressure drop detection means for comparing the tire pneumatic pressure detected by said tire pneumatic pressure detection means with a predetermined value, and detecting a drop of the tire pneumatic pressure when the tire pneumatic pressure is tower than the predetermined value;

    first memory means for storing first data associated with a timing of the drop of the tire pneumatic pressure;

    second memory means for storing second data including one or more of;

    a lapse of time from said first data, and third data associated with a running distance from a point associated with said first data; and

    switching number detection means for detecting a number of switching times of an ignition switch;

    wherein, when the number of switching times detected by said switching number detection means is greater than a predetermined number of times when said tire pneumatic pressure drop detection means detects that the tire pneumatic pressure is higher than said predetermined value, the second data stored in said second memory means is cleared.

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