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Method and apparatus for estimating vehicle braking system effectiveness

  • US 5,299,452 A
  • Filed: 12/08/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 12/08/1992
  • Status: Expired due to Fees
First Claim
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1. Apparatus for estimating the effectiveness of a braking system in a wheeled vehicle including an engine, a brake treadle, and fluid-actuated brakes having normally operable and automatically operable braking modes, the apparatus comprising:

  • means for determining engine torque and generating a torque signal representative thereof;

    means for determining vehicle acceleration and deceleration and generating respective acceleration and deceleration signals representative thereof;

    means for determining brake treadle pressure during vehicle deceleration in the normally operable braking mode and generating a brake pressure signal representative thereof; and

    calculating means for calculating, from data represented by the torque signal and the acceleration signal, vehicle load and for calculating, from data represented by the brake pressure signal and the deceleration signal, braking system effectiveness by comparing the determined deceleration with a deceleration predicted for the calculated vehicle load and the determined brake treadle pressure, the calculating means generating an effective brake signal if the determined deceleration is within a predetermined range of the predicted deceleration and generating an ineffective brake signal if the determined deceleration is not within the range.

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