METHOD FOR AUTOMATICALLY CONTROLLING A TRANSMISSION BRAKE OF AN AUTOMATIC TRANSMISSION CONFIGURED AS A COUNTERSHAFT TRANSMISSION

摘要

The invention relates to a method for automatically controlling a transmission brake of an automatic transmission that is configured as a countershaft transmission. Said transmission brake reduces the speed of a countershaft of the transmission during an upshifting action to such an extent that it corresponds to the synchronized speed or approximates said speed to a defined degree at the clutch-engaging time. In the automatic control of the transmission, the brake gradient of the countershaft speed or transmission input shaft speed and the transmission output shaft speed is taken into consideration. In order to improve upshifting actions, the gradient of the transmission output shaft speed is also evaluated to automatically control the transmission brake.