Method for controlling an electromagnetic valve, in particular for an automatic transmission of a motor vehicle

US7260462B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Norbert Keim · Besigheim, DE
• Christof Ott · Asperg, DE
• Wulf-Siegfried Bayha · Stuttgart, DE
• Martin L. Krohn · Brainerd, US
• Bernd Huber · Schorndorf, DE
• Jens Dorfschmid · Notzingen, DE
• Juergen Semler · Alfdorf, DE

Key dates

• Filing date: Feb 6, 2004
• Grant date: Aug 21, 2007
• Expiry date: May 1, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86493
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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.