Device for the indirect contactless electrical measuring of shor

Details Device for the indirect contactless electrical measuring of shor Device for the indirect contactless electrical measuring of shor

1984-11-30

1987-01-27

Levy, Stewart J.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

336 45, G01M 1500

Patent

active

046386599

ABSTRACT:
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.

REFERENCES:
patent: 3020527 (1962-02-01), MacLaren
patent: 3777255 (1973-12-01), Young et al.
patent: 4362050 (1982-12-01), Stummpp et al.
patent: 4362051 (1982-12-01), Schlagehauf
patent: 4448066 (1984-05-01), Romblom et al.
patent: 4502326 (1985-03-01), Kaczynski

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