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Method to control a hybrid drive train

  • US 8,187,146 B2
  • Filed: 06/03/2009
  • Issued: 05/29/2012
  • Est. Priority Date: 06/12/2008
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a hybrid drive train of a motor vehicle having a serial arrangement of an internal combustion engine (VM), a clutch (K), an electric motor (EM) operating as an engine and a generator, and a drive transmission having an output drivingly connected to a drive axle of the motor vehicle, the method comprising the steps of:

  • during a traction operation of the motor vehicle, initiating a change from an electric driving mode, with the internal combustion engine (VM) shut off, the clutch (K) disengaged and the electric motor (EM) in engine operation, to one of a combination driving mode, with the internal combustion engine (VM) in a traction operation, the clutch (K) engaged and the electric motor (EM) in an engine operation, and an internal combustion driving mode, with the internal combustion engine (VM) in a traction mode, the clutch (K) engaged and the electric motor (EM) shifted to a disconnected state,initiating engagement of the clutch (K)temporarily increasing the torque of the electric motor (EM)regulating engagement of the clutch (K), during engagement, at least until a starting rotational speed (nStart) of the internal combustion engine (VM) is reached,moderating acceleration of the internal combustion engine (VM) according to a predetermined progression of rotational speed (nVM(t)) via, at least, the regulation of clutch engagement;

    increasing a transferable torque (MK) of the clutch (K) through engagement of the clutch (K); and

    increasing a torque (MEM) of the electric motor (EM) concurrently, by an equal magnitude, and at an equal rate as the transferable torque (MK) of the clutch (K) is increased, such that a derivative of the torque (MEM) of the electric motor (EM) with respect to time is equal to a derivative of the transferable torque (MK) of the clutch (K) with respect to time and a change in the torque (MEM) of the electric motor (EM) is equal to a change in the transferable torque (MK) of the clutch (K).

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