| US 7,537,545 B2 | ||
| Method for controlling an automatic transmission and automatic transmission | ||
| Peter Schiele, Kressbronn (Germany); and Christian Popp, Kressbronn (Germany) | ||
| Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany) | ||
| Filed on May 04, 2006, as Appl. No. 11/418,443. | ||
| Claims priority of application No. 10 2005 021 924 (DE), filed on May 12, 2005. | ||
| Prior Publication US 2006/0259223 A1, Nov. 16, 2006 | ||
| Int. Cl. F16H 61/20 (2006.01); B60W 10/04 (2006.01); B60W 10/02 (2006.01) | ||
| U.S. Cl. 477—114 [477/93; 477/175] | 19 Claims |
| 1. A method of controlling disengagement of a drive coupling between an automatic transmission and an engine of a motor vehicle,
the method comprising the steps of:
disengaging the drive coupling to the automatic transmission when both a speed of the motor vehicle is lower than a limiting
speed value and when a parameter of a turbine characteristic of a torque converter is below a limiting value for the parameter
of the turbine characteristic;
re-engaging the drive coupling; and
preventing, after re-engagement, disengagement of the drive coupling until at least one of a given blocking time has elapsed,
the vehicle has travelled a given distance and the speed of the motor vehicle is higher than the limiting speed value.
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