Method and device for actuating a shift element of an automatic transmission having a start-stop means
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 12, 2018
Issued Date -
N/A
app pub date -
Jan 30, 2012
filing date -
Feb 21, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and device for actuating a shift element of an automatic transmission having a start-stop function and a pressure medium pump driven by an internal combustion engine. The shifting elements are clutches or brakes that can be actuated by a piston which is actuated for engagement via pressure supplied to a pressure space. The pressure space is depressurized when the engine stops. To enhance start-stop operation, the shifting elements comprise an additional pressure space that acts, in opposition to the pressure space acting in the engaging direction, as a controllable restoring mechanism which can be rendered inactive, if desired. If the engine stops and the automatic start-stop function is activated, the additional pressure spaces, acting in the restoring direction, are depressurized before the pressure drop in the pressure spaces, acting in the engaging direction, of the pistons, but are otherwise permanently pressurized during driving operation.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2012 Application Filing Year
- F02N Class
- 223 Applications Filed
- 199 Patents Issued To-Date
- 89.24 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- F02N Class
- 25.78 % this patent is cited more than
- 7 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Dec 12, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 12, 2029 |
