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Combined regenerative and friction braking system for a vehicle

  • US 4,671,577 A
  • Filed: 11/21/1985
  • Issued: 06/09/1987
  • Est. Priority Date: 11/21/1985
  • Status: Expired due to Fees
First Claim
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1. A vehicle supported for rolling movement by a multiplicity of wheels including a first set of wheels driven by an electric motor and a second set of wheels, the vehicle having a braking system comprising:

  • braking means operable by an operator aboard the vehicle for generating a brake demand signal whose magnitude is indicative of the level of braking required by the operator;

    a regenerative braking system connected to the electric motor;

    a friction braking system connected to the second set of wheels;

    means for detecting slippage of the wheels relative to a surface on which the vehicle rolls during regenerative braking;

    control means responsive to the slippage detecting means and the brake demand signal for regulating the operation of the regenerative and friction braking systems, the control means serving normally to actuate the regenerative braking system to produce regenerative braking in response to the brake demand signal and to actuate the friction braking system when the brake demand signal exceeds a predetermined level to produce additional braking, the control means responding to the detection of the said slippage during regenerative braking by thereupon actuating the friction braking system to produce additional braking in response to the brake demand signal.

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