Patent ID: 8529400
Filing Date: 2013-09-10
Classification: B60K,B60L,B60W,Y02T,Y10T

Abstract:
1. A method of coupling an internal combustion engine ( 2 ) of a parallel-hybrid drive train ( 1 ) via a clutch device ( 4 ) positioned between the combustion engine ( 2 ) and an electric machine ( 3 ), starting with a disengaged operating condition of the clutch device ( 4 ), a rotational speed (n_mot) of the combustion engine ( 2 ) which matches at least approximately an idle rotation speed (n_mot II), and a rotational speed (n_EM) of the electric machine ( 3 ) that is larger than the idle rotational speed (n_mot_II) of the combustion engine ( 2 ), whereby in a traction mode of the drive train ( 1 ) and in a presence of a request to couple the combustion engine ( 2 ) as well as when a drive torque value is lower than a torque threshold, the rotational speed (n_mot) of the combustion engine ( 2 ) is brought up to the rotational speed (n_EM) of the electric machine ( 3 ) and the clutch device ( 4 ) is at least approximately engaged in a synchronous operating mode, and whereby the torque of the combustion engine ( 2 ) is increased thereafter, the method comprising the steps of: in a presence of a request for a drive torque value which is larger than the torque threshold, increasing the rotation speed (n_mot) of the combustion engine ( once the rotational speed value is reached, slippingly engaging the clutch device ( adjusting the rotational speed (n_mot) of the combustion engine (