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Adaptive controller for regenerative and friction braking system

  • US 4,962,969 A
  • Filed: 09/30/1988
  • Issued: 10/16/1990
  • Est. Priority Date: 09/30/1988
  • Status: Expired due to Term
First Claim
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1. A regenerative and friction braking system for a vehicle having one or more roadwheels driven by an electric traction motor, comprising:

  • driver responsive means for producing a brake demand signal having a magnitude corresponding to the level of braking force selected by the driver;

    friction braking means operatively connected with one or more roadwheels of said vehicle;

    regenerative braking means operatively connected with said electric traction motor; and

    control means for operating said friction braking means and said regenerative braking means, with said control means comprising;

    means for periodically determining the maximum brake torques which may be developed by both of said braking means without causing skidding or slipping of said roadwheels, said means including means for determining the coefficient of friction between at least one of said roadwheels and the surface upon which said vehicle is being operated; and

    means for calculating brake commands for said friction and regenerative braking means based upon said brake demand signal and upon said determining maximum brake torques, such that said determined maximum brake torques will not be exceeded.

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