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Hybrid drive system

  • US 5,318,142 A
  • Filed: 11/05/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 11/05/1992
  • Status: Expired due to Term
First Claim
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1. In an electric vehicle having an ongoing duty cycle, a hybrid drive system, comprising:

  • electric motor/generator means for moving said vehicle;

    plural electrical energy source means in electrical contact with said electric motor/generator means, said plural electrical energy source means including a variable-rate energy storage system, a low-rate energy storage system and a high-rate energy storage system; and

    control means for determining the average power consumption of said vehicle during emission operation throughout said ongoing duty cycle and controlling the extent to which each of said energy source means energizes said electric motor/generator means to move said vehicle, said control means in electrical contact with said plural electrical energy means such that said vehicle may be efficiently operated in both emission and non-emission modes in accordance with environmental restrictions and operator imposed power demands.

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