METHOD AND CONTROL UNIT FOR OPERATING A DRIVE TRAIN OF A HYBRID VEHICLE

摘要

The invention relates to a method for operating a drive train of a hybrid vehicle, wherein the drive train comprises at least one hybrid drive having an internal combustion engine (1) and an electric motor (2), an automatic or semi-automatic transmission (3) connected between the hybrid drive and an output (4), and a clutch (5) connected between the internal combustion engine (1) and the electric motor (2), namely, for starting the internal combustion engine (1) from an electric-only drive mode with an initially open clutch (5). In order to start the internal combustion engine (1), the clutch (5) is at least partially closed and the internal combustion engine is tow-started via the electric motor (2), wherein a downshift of the transmission (3) simultaneously with the starting of the internal combustion engine (1) is initiated when a rotational speed of the internal combustion engine (1) reaches or exceeds an applicable threshold value.