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Method for determining the response pressure of motor vehicle brakes using a test pressure

  • US 6,772,625 B2
  • Filed: 12/02/2002
  • Issued: 08/10/2004
  • Est. Priority Date: 05/30/2000
  • Status: Expired due to Fees
First Claim
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1. A method for determining a response pressure of brakes of a vehicle, the method comprising the acts of:

  • a) admitting a test pressure to the brakes to be examined;

    b) measuring rotational wheel speed signals at at least two axles of the vehicle;

    c) from the measured rotational wheel speed signals, determining an acceleration signal;

    d) after applying the test pressure to the brakes to be examined, determining a brake pressure at the brakes to be examined;

    e) in each case, for a driving condition with and without applying the test pressure, forming a differential speed signal(s) as a function of a difference between rotational wheel speed signals of a powered and of a non-powered axle;

    f) forming test pressure indicator signals, respectively, each as a function of the acceleration signal and the differential speed signal; and

    g) comparing two test pressure indicator signals formed, and repeating steps (a)-(f) with an increased test pressure when the two test pressure indicator signals coincide, and emitting the applied test pressure when the two test pressure indicator signals do not coincide.

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