Method for controlling an electromagnetic actuator with compensation for changes in ohmic resistance of the electromagnet coil

US5831809A · kind A · utility

Assignee

• FEV Motorentechnik GmbH & Co., KG · DE

Inventors

• Guenter Schmitz · Oldenburg, DE
• Ekkehard Schrey · Aachen, DE

Key dates

• Filing date: Sep 4, 1996
• Grant date: Nov 3, 1998
• Expiry date: Sep 4, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method is provided for controlling an electromagnetic actuator having an electromagnet including a magnetic core presenting a pole face and an electromagnet coil wound around the magnetic core, a return spring and an armature connected to an actuation mechanism and movable toward the pole face by a magnetic force of the electromagnet against the force of the return spring. The method includes: detecting a time behavior and/or value of current and/or voltage present at the electromagnet coil during a time period when the armature does not move relative to the electromagnet, and deriving a value corresponding to the actual ohmic resistance and/or inductance of the electromagnet coil from the detected time behavior and/or value from the detecting step for compensating changes in the ohmic resistance of the electromagnet coil.