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Detection device for decreased tire pressures and method thereof

  • US 7,340,369 B2
  • Filed: 09/14/2005
  • Issued: 03/04/2008
  • Est. Priority Date: 09/24/2004
  • Status: Expired due to Fees
First Claim
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1. A detection device for detecting whether the kind of tires mounted on different wheels of a vehicle differs, the device comprising:

  • means for detecting the rotational speeds of wheels mounted on the vehicle;

    means for detecting torque applied to driving wheels of the vehicle;

    means for calculating the inclination of a first straight line representing the relation between (1) a ratio of the rotational speed of a left front wheel to that of a left rear wheel of the vehicle and (2) torque applied to driving wheels of the vehicle;

    means for calculating the inclination of a second straight line representing the relation between (1) a ratio of the rotational speed of a right front wheel to that of a right rear wheel of the vehicle and (2) the torque applied to driving wheels;

    means for comparing the inclination of the first straight line with the inclination of the second straight line;

    means for comparing a difference or a ratio between the inclinations of the first and second straight lines with predetermined values for a difference or a ratio between the inclinations;

    means for determining from the difference or the ratio between the inclinations whether different tires are mounted on left and right sides of the vehicle; and

    means for providing an indication of whether different tires are mounted on left and right sides of the vehicle.

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