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Method for operating a hybrid drive system

  • US 6,868,927 B2
  • Filed: 10/24/2002
  • Issued: 03/22/2005
  • Est. Priority Date: 10/25/2001
  • Status: Expired due to Term
First Claim
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1. A method for operating a hybrid drive system for a traction drive in a motor vehicle, the method comprising:

  • operating the traction drive using an electrical motor with power supplied from an auxiliary power unit;

    supplying power from an energy storage device to the electric motor when the traction drive demands power which are greater than the maximum possible power output of the auxiliary power unit; and

    supplying power from an internal combustion engine only when the traction drive'"'"'s power demand is greater than the total maximum possible power output from the auxiliary power unit and from the energy storage device.

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