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Method for controlling a hybrid drivetrain

  • US 8,062,173 B2
  • Filed: 06/03/2009
  • Issued: 11/22/2011
  • Est. Priority Date: 06/12/2008
  • Status: Active Grant
First Claim
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1. A method of controlling a hybrid drivetrain of a motor vehicle, in which the motor vehicle has, arranged in series, a combustion engine (VM), a separator clutch (K), an electric machine (EM) that is operable as a motor and a generator, and a drive transmission which is drivingly connected, on an output side thereof, with a drive axle of the motor vehicle such that, during a thrust operation of the motor vehicle, a change takes place either from a combustion-powered driving mode in which the combustion engine (VM) is in a thrust operation, the separator clutch (K) is engaged and the electric machine (EM) does not contribute any driving no force, or from a combined driving mode in which the combustion engine (VM) is in the thrust operation, the separator clutch (K) is engaged and the electric machine (EM) operates as a generator, to an electric driving mode in which the combustion engine (VM) is turned off, the separator clutch (K) is disengaged and the electric machine (EM) operates as a generator, the change to the electric driving mode, during the thrust operation of the motor vehicle, is carried out by the method comprising the steps of:

  • commencing disengagement of the separator clutch (K) up to a slip limit;

    disengaging the separator clutch (K) from the slip limit until the separator clutch (K) is completely disengaged; and

    from the slip limit until the separator clutch (K) is completely disengaged, increasing generator torque (MEM) by a same amount as the reduction of torque (MK) that is transmitted by the separator clutch (K) when the separator clutch (K) is being disengaged.

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