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Method and apparatus for alarming decrease in tire air-pressure

  • US 20040021557A1
  • Filed: 07/30/2002
  • Published: 02/05/2004
  • Est. Priority Date: 07/30/2002
  • Status: Active Grant
First Claim
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1. A method for alarming decrease in tire air-pressure, in which rotational numbers of four tires are detected for judging, on the basis of the detected rotational numbers, whether any of the tire air-pressures is decreased or not, and issuing an alarm in case an internal pressure of a tire is decreased, wherein in an equation for calculating a judged value for detecting deflation of a tire upon comparing differences of two diagonal sums, correction factor function values including a first factor related to lateral acceleration of the vehicle and a second factor related to lateral acceleration and front and rear wheel ratios are subtracted from actually measured values when performing actual running of the vehicle with the tires being set to specific air-pressures, and the first and second factors are so calculated that a result of subtraction is approximately close to zero and are stored.

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