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Tire cold state detection and monitoring methods

  • US 5,780,733 A
  • Filed: 02/26/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 03/06/1996
  • Status: Expired due to Term
First Claim
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1. A method of processing signals in a system for the monitoring of the tires of a vehicle, said system delivering an ambient temperature measurement and, for each tire, at least one measurement of the inflation pressure of said tire and one measurement of the temperature in the environment of said tire, in which:

  • (a) upon each stopping of the system, at least one ambient temperature measurement as well as one environmental temperature measurement for each tire is stored in non-volatile memory;

    (b) upon each starting of the system, the stop time of the system is compared with a critical time which itself is variable as a function of the values of the temperatures stored upon the stopping of the system;

    (c) if the stop time is greater than or equal to said critical time, a verification of the inflation pressure of the said tires is effected, which is recorded in a so-called cold mode and then switched into a hot verification mode; and

    (d) if the stop time is less than said critical time, switching is immediately effected into a hot verification mode.

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