Method and apparatus for controlling an electromagnetic switching member

US5880920A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Fischer · Heimsheim, DE
• Dietbert Schoenfelder · Gerlingen, DE
• Viktor Kahr · Milano, IT
• Davide De Giorgi · Jeffery Road, DE
• Kai-Lars Barbehoen · Ludwigsburg, DE
• Hartmut Ressel · Reutlingen, DE

Key dates

• Filing date: Mar 26, 1997
• Grant date: Mar 9, 1999
• Expiry date: Mar 26, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/2058
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and an apparatus for controlling an electromagnetic switching member having an excitation winding and a movable armature. A first time point and a second time point define a time window. Within the time window, the current characteristic and/or the voltage characteristic is evaluated in order to detect a switching time point at which the armature reaches a new limit position. The time window is enlarged if no reliable switching time point was detected within the time window.