VORRICHTUNG ZUM INDIREKTEN BERUEHRUNGSLOSEN ELEKTRISCHEN MESSEN KLEINER WEGE

A device is provided for the indirect contactless electrical measuring of short distances, particularly for measuring the stroke and/or the position of nozzle needles for injection nozzles of internal combustion engines. A coil having a solid core of a soft-magnetic alloy is used as magnetic field s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FORKEL, WERNER, SCHIESSLE, EDMUND
Format:	Patent
Sprache:	ger
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS BLASTING COMBUSTION ENGINES HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR MECHANICAL ENGINEERING PHYSICS SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TARIFF METERING APPARATUS TESTING WEAPONS
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Beschreibung
Zusammenfassung:	A device is provided for the indirect contactless electrical measuring of short distances, particularly for measuring the stroke and/or the position of nozzle needles for injection nozzles of internal combustion engines. A coil having a solid core of a soft-magnetic alloy is used as magnetic field sensor and a low-mass permanent magnet. The permanent magnet is rigidly connected to a moving control element. The nozzle needle is fixed to the control element. Movement of the permanent magnet in relation to the coil causes a change in the magnetic flux density in the core of the coil and, via the nonlinear function B=f(H) of the mangetization curve, effects a change in the dynamic permeability and consequently in the inductance of the coil. The change in inductance of the coil is converted by a suitable electronic evaluating circuit into a path-analogue signal to determine the distance between the fixed coil and the movable permanent magnet. Thus, movement of the nozzle needle which is fixed in relation to the permanent magnet can be precisely monitored.