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Tire air pressure reduction detecting method and apparatus

  • US 5,578,984 A
  • Filed: 10/28/1994
  • Issued: 11/26/1996
  • Est. Priority Date: 11/04/1993
  • Status: Expired due to Term
First Claim
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1. A tire air-pressure reduction judging method of detecting rotational angular speeds of the four tires attached to a four-wheeled vehicle and detecting a reduction in the air pressure of a tire based on the detected rotational angular speeds, said method comprising the steps of:

  • obtaining, as functions of speeds or forward/backward accelerations, the ratios of the rotational angular speeds of driving tires under normal pressure to the rotational angular speeds of non-driving tires under normal pressure, and storing the relationship between said speeds or forward/backward accelerations and said ratios thus obtained;

    obtaining the speed or forward/backward acceleration of the vehicle while the vehicle actually travels;

    obtaining, based on said stored relationship, the ratio corresponding to said speed or forward/backward acceleration thus obtained;

    correcting said rotational angular speeds based on said ratio thus obtained; and

    detecting a reduction in the air pressure of a tire based on said rotational angular speeds thus corrected.

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