Actuator unit, in particular for injecting a fuel into a combustion chamber of an internal combustion engine

US9523333B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Stephan Bolz · Pfatter, DE
• Martin Goetzenberger · Ingolstadt, DE

Key dates

• Filing date: Oct 9, 2013
• Grant date: Dec 20, 2016
• Expiry date: Feb 26, 2035

Classification

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

Abstract

An actuator unit for injecting fuel into a combustion chamber of an internal combustion engine includes an electrically conductive excitation winding, a ferromagnetic circuit having a ferromagnetic return, and a moveable armature. The armature is held in an idle position by a holding force of a spring element. A current flowing through the excitation winding produces (a) a magnetic holding force acting on the armature in the same direction as the spring holding force provided by the spring element, and (b) a magnetic motive force acting on the armature in the opposite direction as the magnetic holding force and spring holding force. The armature can be moved to a working position in which the armature adjoins the ferromagnetic return by increasing the current through the excitation winding above a predetermined value that results in the magnetic motive force exceeding the magnetic holding force combined with the spring holding force.