| US 7,370,548 B2 | ||
| Method for controlling and regulating a transmission brake in an automatic motor vehicle transmission | ||
| Volker Bachmann, Eriskirch (Germany); Mario Steinborn, Friedrichshafen (Germany); Rudolf Kalthoff, Weingarten (Germany); and Anthony Robert Sayman, Laurinburg, N.C. (US) | ||
| Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany) | ||
| Appl. No. 10/563,417 PCT Filed Jun. 08, 2004, PCT No. PCT/EP2004/006145 § 371(c)(1), (2), (4) Date Jan. 27, 2006, PCT Pub. No. WO2005/003601, PCT Pub. Date Jan. 13, 2005. |
||
| Claims priority of application No. 103 30 517 (DE), filed on Jul. 05, 2003. | ||
| Prior Publication US 2006/0179963 A1, Aug. 17, 2006 | ||
| Int. Cl. F16H 3/38 (2006.01) | ||
| U.S. Cl. 74—339 | 7 Claims |
| 1. 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.
|