US 2001/0022163 A1Published application

Process for operating an electromagnetic actuator

AssigneeBayerische Motoren Werke Aktiengesellschaft

InventorsRalf Cosfeld, Konrad Reif

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Abstract

A process for operating an electromagnetic actuator is provided, in particular to actuate a gas exchange lift valve of an internal combustion engine, with an armature, which is moved oscillatingly between two electromagnetic coils against the force of at least one return spring via an alternating supply of current to the electromagnetic coils. Whereby, during the so-called catch process as the armature approaches the coil that is subjected first to a current flow, the voltage applied to the coil catching the armature is reduced. To avoid unnecessary losses, a voltage curve is chosen with which an eddy current, calculated with a mathematical model, is minimized in the armature.

Claims8

Dependent claims

A process for controlling an electromagnetic actuator operating a gas exchange lift valve of an internal combustion engine, said actuator having an armature moving in an oscillating manner between two electromagnetic coils against at least one return spring force via an alternating supply of current to the two electromagnetic coils, the process comprising the acts of:

reducing a voltage applied to a respective one of the two electromagnetic coils catching the armature during a catch process as the armature approaches said one coil that is subjected first to a current flow;
and
wherein for reducing the voltage, the process selects a voltage control method having a voltage curve in which an eddy current in the armature is minimized, said eddy current being calculated via a mathematical model.

Dependencies are inferred from the claim text.

Facts

Application: 09/809,297Filed 16 Mar 2001
Priority: DE 100 12 988.916 Mar 2000
Published: 20 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F01L 9/20
Valve-gear or valve arrangements actuated non-mechanically: by electric means
F02D 13/0253
During engine operation: fully variable control of valve lift and timing using camless actuation systems such as hydraulic, pneumatic or…
F02D 41/20
Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils
F01L 2009/4086
Methods of operation thereof; Control of valve actuation, e.g. duration or lift: soft landing, e.g. applying braking current; Levitation of…

Family

US 6,499,447 B2Related patent
US 2001/0022163 A1This patent

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