Patent ID: 7370548

Claim:
A method for controlling and regulating a transmission brake of an automatic transmission constructed with a countershaft, and having a transmission input shaft, with at least one countershaft driven by the transmission input shaft, and with a transmission output shaft, the method comprising the steps of: supporting at least one of rotatably loose gears and non-rotatable fixed gears, which at least stand in a pair forming mesh grip with one another, on at least one of the transmission input shaft, the countershaft and the transmission output shaft; non-rotatably binding loose gears with a transmission shaft for carrying out a gear change by a coupling apparatus as well as with a transmission brake, with which the countershaft, controlled by a control device, can be braked upon an upshift procedure in such a way that a speed of rotation thereof corresponds to an engagement point in time of a synchronous speed of rotation or approaches this condition up to a predetermined tolerance; considering a brake rate of change of the speed of rotation of the transmission input as well as a rate of change of speed of rotation of the transmission output shaft for determination of a disengagement point in time of the transmission brake; and disengaging the transmission brake, under consideration of a lead time, prior to the determined disengagement point in time.