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System for monitoring tire status

  • US 6,304,802 B1
  • Filed: 09/21/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 03/22/1997
  • Status: Expired due to Term
First Claim
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1. A system for outputting a signal representing a condition of the wheels of a motor vehicle, the system comprising:

  • means for generating rpm signals (Nij) representing the rotational movements of the wheels; and

    , evaluation means functioning to;

    form first difference values (Δ

    r, Δ

    l) for the rpm differences of at least two vehicle wheels on the two sides of the vehicle in dependence upon said generated rpm signals (Nij);

    compare the first difference value (Δ

    r) of one side of said vehicle to a first adequately large threshold value (SW1);

    compare the first difference value (Δ

    l) of the other side of said vehicle to a first small threshold value (SW2); and

    , output a signal (S;

    Sij) when all of the following conditions are satisfied;

    (a) the first difference value (Δ

    r) of said one side of said vehicle exceeds said first adequately large threshold value (SW1);

    (b) the first difference value (Δ

    l) of said other side of said vehicle is less than said first small threshold value (SW2); and

    , (c) said first difference value (Δ

    r) exceeds said first adequately large threshold value (SWl) simultaneously with said first difference value (Δ

    l) being less than said first small threshold value (SW2).

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