Patent ID: 7166059
Filing Date: 2007-01-23
Classification: B60K,B60W,B60Y,F16H,Y02T,Y10T

Abstract:
1. A method for upshifting a parallel shift transmission having two input shafts ( 18 , 20 ), each of which is coupleable via a clutch (K 1 , K 2 ) to a drive shaft ( 12 ) of a driving engine, and an output shaft ( 22 ), which may be brought into rotationally fixed engagement with the input shafts via different transmission gear sets, and at least one electric machine ( 32 ) that is rotationally fixedly joined to an input shaft for output of a boost torque, which boosts the driving torque of the driving engine, in which method the boost torque produced by the at least one electric machine ( 32 ) during a phase in which the speed of the driving engine ( 14 ) drops when shifting from an old gear into a new, higher gear is at least approximately replaced by torque produced by the driving engine as a result of the drop in speed, said method comprising the following steps: a) lowering the torque transmitted by the clutch assigned to the old gear from a starting value to approximately zero; b) essentially simultaneously increasing of the torque transmitted by the clutch assigned to the new, next-higher gear from zero to approximately the starting value; c) maintaining the boost torque that is output by the electric machine before the beginning of step a) during steps a) and b); d) increasing of the torque transmitted by the clutch assigned to the new, next higher gear beyond the starting value; e) essentially simultaneously lowering the boost torque to approximately zero; f) lowering of the torque transmitted by the clutch assigned to the new, next higher gear to approximately the starting value; and, g) essentially simultaneously increasing of the boost torque to approximately its starting value.