The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2007
Filed:
Feb. 06, 2004
Norbert Keim, Loechgau, DE;
Christof Ott, Asperg, DE;
Wulf-siegfried Bayha, Stuttgart, DE;
Martin Krohn, Weinstadt, DE;
Bernd Huber, Schorndorf, DE;
Jens Dorfschmid, Frickenhausen, DE;
Juergen Semler, Alfdorf, DE;
Norbert Keim, Loechgau, DE;
Christof Ott, Asperg, DE;
Wulf-Siegfried Bayha, Stuttgart, DE;
Martin Krohn, Weinstadt, DE;
Bernd Huber, Schorndorf, DE;
Jens Dorfschmid, Frickenhausen, DE;
Juergen Semler, Alfdorf, DE;
Robert Bosch GmbH, Stuttgart, DE;
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.