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Process and system for detecting decrease in tire air-pressure and tire deflation judging program

  • US 20070010964A1
  • Filed: 07/06/2006
  • Published: 01/11/2007
  • Est. Priority Date: 07/08/2005
  • Status: Active Grant
First Claim
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1. A process of detecting decrease in tire air-pressure based on wheel rotational velocities obtained from tires mounted on a vehicle, which comprises the steps of:

  • detecting wheel rotational velocities of the respective tires;

    obtaining a judgment value for decrease in tire air-pressure based on a relative comparison between the obtained wheel rotational velocities;

    storing the judgment value in an average preparation buffer;

    calculating an average value of the judgment values stored in the average preparation buffer to write the average value and the number of the judgment values into a nonvolatile memory at a predetermined timing;

    expanding the average value that is written in the nonvolatile memory into the average preparation buffer in duplicate corresponding to the number of judgment values; and

    calculating an average value of a prescribed number of judgment values that are stored in the average preparation buffer so as to compare the average value with a predetermined threshold value, thereby judging whether or not a decrease in tire air-pressure occurs.

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