Patent ID: 7957869
Filing Date: 2011-06-07
Classification: F16H,Y10T

Abstract:
1. A method of operating an automatic transmission of a motor vehicle, the automatic transmission comprising at least five shift elements, at least three of which are engaged in each of a forward gear and a reverse gear to transfer one of torque or force, in disengaging a gear for shifting the automatic transmission from a forward gear or a reverse gear to a neutral position at least one of the at least three shift elements that are engaged in the respective forward gear or the reverse gear is completely disengaged, the method comprising the steps of: disengaging a first shift element of the at least three shift elements that are engaged in the respective forward gear or the reverse gear, out of all of the shift elements that are to be disengaged in the gear disengagement; one of partially disengaging and partially filling the first shift element in a controlled manner in a first time interval, such that the first shift element transfers essentially no torque and the transfer of the torque or the force of the automatic transmission is interrupted; completely disengaging the first shift element in a subsequent, second time interval following the first time interval, starting from the partially disengaged condition of the first shift element; and completely disengaging a second shift element and a third shift element of the at least three shift elements that are engaged in the respective forward gear or the reverse gear during the second time interval.