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Drivetrain and associated operating method

  • US 7,806,801 B2
  • Filed: 07/30/2007
  • Issued: 10/05/2010
  • Est. Priority Date: 07/28/2006
  • Status: Expired due to Fees
First Claim
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1. A method for operating a drivetrain, the drivetrain including an internal combustion engine, an electric motor, a transmission, and a torque converter with a converter bypass clutch, and the method which comprises the following steps:

  • in an electric operating mode in which the internal combustion engine is deactivated and the electric motor is activated, and/or during a recuperation operating mode in which the internal combustion engine is deactivated and the electric motor is operated as a generator, closing without slipping the converter bypass clutch, at least between shift processes of the transmission, for bypassing the torque converter; and

    driving a hydraulic medium pump, which supplies hydraulic medium at operating pressure to a hydraulic actuating device for actuating the converter bypass clutch, and which is drive-coupled to the drivetrain, by way of an electric auxiliary motor below a predetermined limit rotational speed of the drivetrain and/or below a predetermined limit pressure in the hydraulic medium.

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