Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Reexamination Certificate
2007-08-21
2007-08-21
Nguyen, Cuong (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
C239S585200, C239S585100, C239S585500, C091S459000, C137S625000
Reexamination Certificate
active
10773668
ABSTRACT:
A method for controlling an electromagnetic valve, in particular for an automatic transmission of a motor vehicle. With known methods, electromagnetic valves are triggered with a pulse-width-modulated signal having a constant clock frequency. The object is to provide a method by which a rapid response characteristic and a high adjustment precision of the electromagnetic valve are made possible. The specific properties of a hydraulic system in which electromagnetic valves are used, in particular the rigidity and damping, are not constant but instead change considerably under different operating states of the hydraulic system and/or with different performance quantities of the electromagnetic valve. These different properties are taken into account through the change in the clock frequency as a function of performance quantities of the electromagnetic valve. The clock frequency may thus be optimally adapted to the properties of the hydraulic system, and a rapid response characteristic and a high adjustment precision are achieved.
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English language translation of claim 1 of DE 33 20 110, filed Mar. 27, 2007.
English language translation of Abstract of DE 298 09 412, filed Mar. 27, 2007.
Bayha Wulf-Siegfried
Dorfschmid Jens
Huber Bernd
Keim Norbert
Krohn Martin
Kenyon & Kenyon LLP
Nguyen Cuong
Robert & Bosch GmbH
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