Electromagnetically actuatable adjustment device and method of operation
AssigneeDaimlerChrysler AG
InventorsNils Hein, Peter Hille, Thomas Ganser
Life of this patent
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Abstract
A method for operating an electromagnetically actuatable adjustment member, in particular a periodically operated valve for an internal combustion engines, as well as a/an apparatus for carrying out the method, wherein a path or position sensor is provided to measure the position of the adjustment member, and the current flow through the electromagnets of the device is adjusted such that the adjustment member moves along a predetermined position/speed characteristic curve.
Claims17
A method for operating an electromagnetically actuatable adjustment device, including an adjustment member connected to a connecting rod having at least one armature that is attached crosswise to its longitudinal axis, with the armature being moved between opposing pole surfaces of two electromagnets arranged at a distance to each other in an axial direction, two resetting springs that are effective in the axial direction connected to the connecting rod so that the armature is held in a center position between the electromagnets while the electromagnets are not supplied with current, and a path sensor element for detecting the position of at least one of the adjustment member and the armature, with the path sensor element being a coil disposed in an oscillator circuit and whose inductance is changed through a position change of the adjustment member;
- said method including:
- measuring the inductance of the coil by measuring the frequency of the oscillating circuit;
- and, based on the measured frequency, adjusting the current flow through the electromagnets such that at least one of the armature and the adjustment member move along a predetermined position/speed characteristic curve.
An electromagnetically actuatable adjustment device, comprising:
- an adjustment member;
- a connecting rod connected to the adjustment member and having at least one armature attached thereto and extending crosswise to a longitudinal axis of the connecting rod, with the armature being moveable between opposing pole surfaces of two electromagnets arranged at a distance from each other in an axial direction of the connecting rod;
- two resetting springs that are effective in the axial direction connected to the connecting rod so that the armature is held in a center position between the electromagnets when the electromagnets are not supplied with current;
- a path sensor element for detecting the position of at least one of the adjustment member and the armature, with the path sensor element being a coil whose inductance is changed through a position change of the adjustment member;
- and means for measuring the inductance of the coil and for adjusting the current flow through the electromagnets such that at least one of the armature and the adjustment member moves along a predetermined position/speed characteristic curve.
An electromagnetically actuatable adjustment device, comprising:
- an adjustment member;
- a connecting rod connected to the adjustment member and having at least one armature attached thereto and extending crosswise to a longitudinal axis of the connecting rod, with the armature being moveable between opposing pole surfaces of two electromagnets arranged at a distance from each other in an axial direction of the connecting rod;
- two resetting springs that are effective in the axial direction connected to the connecting rod so that the armature is held in a center position between the electromagnets when the electromagnets are not supplied with current;
- a path sensor element for detecting the position of at least one of the adjustment member and the armature and producing a corresponding output signal, with the path sensor element being at least one of a capacitive sensor, an optical sensor, a magnetic sensor, a semiconductor sensor and a Hall sensor;
- and means responsive to the output signal of the path sensor element for adjusting the current flow through the electromagnets such that at least one of the armature and the adjustment member moves along a predetermined position/speed characteristic curve.
Dependencies are inferred from the claim text.