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Device and method for monitoring the air pressure in the tires of a motor vehicle

  • US 6,946,954 B2
  • Filed: 06/05/2003
  • Issued: 09/20/2005
  • Est. Priority Date: 12/05/2000
  • Status: Active Grant
First Claim
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1. A device for monitoring an air pressure in vehicle tires, comprising:

  • determining units configured to determine wheel speed variables characterizing wheel speeds of a motor vehicle;

    a calculating unit operatively connected to said determining units and configured to calculate differential variables from the wheel speed variables;

    an evaluation unit configured to evaluate the differential variables with respect to a setpoint value deviation, said evaluation unit generating a warning signal if the setpoint value deviation exceeds a first threshold value;

    a measuring unit operatively connected to said evaluation unit, said measuring unit being configured to directly measure an air pressure in a tire of a wheel and configured to transmit a pressure variable characterizing the air pressure to said evaluation unit; and

    said evaluation unit further generating a warning signal if a deviation of the pressure variable from a pressure setpoint value exceeds a second threshold value, said evaluation unit using a first tolerance range for a permitted setpoint value deviation of the differential variables, the first tolerance range representing a first pressure difference range, said evaluation unit further using a second tolerance range for a permitted setpoint value deviation of the pressure variable, the second tolerance range representing a second pressure difference range, the first pressure difference range being smaller than the second pressure difference range.

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