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Hybrid drive system for a motor vehicle

  • US 7,377,344 B2
  • Filed: 05/12/2006
  • Issued: 05/27/2008
  • Est. Priority Date: 11/14/2003
  • Status: Expired due to Fees
First Claim
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1. A hybrid drive system for a vehicle, the hybrid drive system comprising:

  • an internal combustion engine;

    an electric machine operable as an electric motor and a generator;

    a transmission having a continuously variable ratio;

    a first clutch coupling the internal combustion engine with the electric machine;

    a second clutch coupling the electric machine with the transmission, which transmission is connectable to a drive shaft of the vehicle;

    an electric energy accumulator;

    a converter device for controlling energy flow between the electric machine and the electric energy accumulator;

    an electric control device adapted to control the internal combustion engine, the transmission, the converter device and the first and second clutches as a function of a charge state of the energy accumulator and a drive power demand of the vehicle, the control device further adapted to control a starting of the internal combustion engine, when the second clutch is at least partially closed, by closing the first clutch;

    wherein, during the starting of the internal combustion engine while driving the continuously variable ratio of the transmission is stepped down during the closing of the first clutch.

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