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Tire air pressure warining device

  • US 5,826,210 A
  • Filed: 03/29/1994
  • Issued: 10/20/1998
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Term
First Claim
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1. A tire air pressure warning device that judges a tire air pressure abnormality utilizing detected signals from wheel velocity sensors that separately detect the revolving state of each tire of a vehicle, and outputs a warning signal, comprising:

  • a deviation width changing means for changing the prescribed width of a deviation width wherein, the tire air pressure abnormality is judged by a comparison between a deviation value which is determined from a prescribed equation based on the difference between the number of revolutions of each tire, and the average number of tire revolutions, and deviation width having a prescribed width; and

    prescribed value change means for judging tire air pressure abnormality by comparing the deviation value with a deviation width having a prescribed maximum value and a prescribed minimum value, and changing the prescribed maximum and minimum values in accordance with the vehicle running conditions,wherein, if the tire temperature is beyond a prescribed temperature, the prescribed width of said deviation width is changed to a fixed value, and further increase said prescribed width as a temperature of the tire increases until said prescribed width reaches a predetermined value.

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