When a gearshift is carried out in an automated manual transmission, in which gearshift an interlocking shifting element is involved, and when the gearshift is carried out which involves an interlocking shifting element connected between two gear systems, tooth-on-tooth positions can occur at the interlocking shifting element which prevent the interlocking shifting element from closing. To carry out the gearshift such tooth-on-tooth positions have to be eliminated.
To eliminate such tooth-on-tooth positions at interlocking shifting elements, actuators are used. From the prior art various methods or procedures are known for eliminating a tooth-on-tooth position at an interlocking shifting element, these various methods or procedures differing in particular in the actuators involved in the tooth-on-tooth position.
For the elimination of a tooth-on-tooth position at an interlocking shifting element fundamentally conflicting criteria have to be fulfilled, namely on the one hand the elimination of the tooth-on-tooth position at the interlocking shifting element should take place as quickly as possible, and on the other hand it should take place as comfortably as possible, granted that an elimination of a tooth-on-tooth position at an interlocking shifting element is the more comfortable, the less the drive-train is affected by knocks.
From DE 10 2006 046 605 A1 a method for eliminating a tooth-on-tooth position at an interlocking shifting element of a transmission is known, in which prior art the tooth-on-tooth position at an interlocking shifting element can be eliminated by using a driving clutch or transmission brake as the actuator.
From EP 1 572 491 B1 another method for eliminating a tooth-on-tooth position at an interlocking shifting element of a transmission is known, in which prior art, to eliminate the tooth-on-tooth position a clutch is regulated selectively and during this it is checked whether the tooth-on-tooth position has actually been eliminated. If after an operating attempt a tooth-on-tooth position cannot be eliminated, then in a subsequent operating attempt a target parameter of the clutch is increased in order to eliminate the tooth-on-tooth position in the next operating attempt.
From DE 10 2005 012 308 A1 a further method for eliminating a tooth-on-tooth position at an interlocking shifting element is known, such that in this method too an actuator is operated with a defined target parameter to eliminate the tooth-on-tooth position at the interlocking shifting element. In this case the target parameter is a clutch position, which is adapted as a function of a reaction signal from a transmission.