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Method and device in tractor-trailer brakes

  • US 5,273,347 A
  • Filed: 10/15/1991
  • Issued: 12/28/1993
  • Est. Priority Date: 04/21/1989
  • Status: Expired due to Fees
First Claim
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1. A method for controlling an operating brake pressure to pressure medium brakes arranged in a vehicle combination, said vehicle combination comprising a tractor vehicle with a driver and at least one trailer vehicle, said vehicles being connected by a conventional coupling device, and wherein said driver of said tractor vehicle generates by a brake valve, an operating pressure determining said operating brake pressure for said tractor and trailer vehicles, and wherein forces arising in said coupling device measured by a force sensitive transducer during braking and are reduced by an electrically controlled valve to a predetermined force valve, comprising the steps of:

  • measuring said operating pressure with a pressure sensitive transducer and converting it into an electric signal;

    recording with an accelerometer any longitudinal inclination of said tractor vehicle and any acceleration and deceleration, respectively, of said vehicle combination;

    controlling said operating brake pressure when said operating pressure measured exceeds a predetermined pressure value, said recorded longitudinal inclination is below a predetermined inclination value, and said deceleration exceeds a predetermined deceleration value, said controlling of said operating brake pressure being achieved by opening and closing said electrically controlled valve, thereby adjusting said electric signal to decrease said forces, and by storing in a central unit an adjustment setting of said controlled pressure so as to be an initial adjustment setting at a subsequent braking.

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