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Method and apparatus for tire pressure monitoring

  • US 20050044946A1
  • Filed: 10/08/2004
  • Published: 03/03/2005
  • Est. Priority Date: 06/12/2003
  • Status: Abandoned Application
First Claim
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1. A method for indicating a pressure loss condition in tires of a vehicle, each tire having a speed related to vehicle speed and to vehicle operating condition, the method comprising:

  • storing a predetermined number of tire speed patterns, each tire speed pattern representing relative tire speed conditions corresponding to a respective normal vehicle operating condition which results in tire speed variations;

    storing a predetermined tire pressure for the tires;

    storing a respective tire speed pressure loss pattern for each tire representing a relative tire speed condition when said tire is experiencing a pressure loss condition;

    sensing the speed of each of the tires;

    sensing the pressure of a single tire of the tires;

    sensing if the vehicle is turning;

    determining an actual tire speed pattern from the sensed speeds of the tires representing an actual relative tire speed condition; and

    determining if the actual tire speed pattern corresponds to any one of the stored tire speed patterns based on whether or not the vehicle is turning, and (A) if not, determining whether there is a pressure loss condition in the tires by comparing the actual tire speed pattern with the stored tire speed pressure loss patterns and indicating a pressure loss condition when the actual pattern corresponds to at least one of the stored tire speed pressure loss patterns, and (B) if so, bypassing the step of determining whether there is a pressure loss condition.

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