Method for automatically controlling a transmission brake of an automatic transmission configured as a countershaft transmission

A method for controlling and regulating a transmission brake of an automatic gearbox designed as a gear reduction unit, with a gear input shaft, with at least one countershaft that can be driven by the gear input shaft and with a gear output shaft,

• on which loose cog wheels are seated on the gear input shaft, on the countershaft and/or on the gear output shaft and/or having loose rotational cog wheels seated non-rotatably and/or stationary cog wheels seated non-rotatably, which at least form pairs in tooth engagement with one another,
• whereby the loose wheels are connected non-rotatably to the gear shaft by means of the clutch arrangements to be able to perform a gearshift, as well as with a transmission brake and a control apparatus for controlling and regulating at least this transmission brake, with which the countershaft can be decelerated during an upshift,
• that the rotation speed until the coupling time corresponds to the synchronized rotation speed or is close to a predetermined distance,
• whereby the control and regulation of the transmission brake takes the brake gradient of the countershaft speed or the gear input shaft rotation speed as well as the gear output shaft rotation speed into consideration,
• wherein for the control and regulation of the transmission brake additionally the gradient and the gear output shaft rotation speed is analyzed.

A method for controlling and regulating a transmission brake of an automatic gearbox having a gear input shaft, a gear output shaft and at least one countershaft that can be driven by the gear input shaft, the method comprising the steps of

• seating cog wheels on one or more of the countershaft, the gear output shaft and the gear input shaft, the cog wheels are one of loose rotational cog wheels non-rotatably seated or stationary cog wheels non-rotatably seated and are, in pairs, in tooth engagement with one another,
• connecting the loose wheels, non-rotatably, to the gear shaft through clutch arrangements in order to perform a gearshift,
• connecting the loose wheels with a transmission brake and a control apparatus for controlling and regulating at least this transmission brake to decelerate the countershaft during an upshift such that the rotation speed, until a coupling time, corresponds to a synchronized rotation speed or is close to a predetermined distance,
• considering one of a brake gradient of the countershaft speed or the gear input shaft rotation speed and the gear output shaft rotation speed when controlling and regulating the transmission brake,
• additionally analyzing the brake gradient and the gear output shaft rotation speed to control and regulate the transmission brake.