Inductive transducer responsive to displacement along a path

Details Inductive transducer responsive to displacement along a path Inductive transducer responsive to displacement along a path

1980-09-25

1982-11-09

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

324208, 336 75, 336 79, 34087032, G08C 1908

Patent

active

043587623

ABSTRACT:
The variable inductor and the comparison inductor of a semi-differential variable inductance both have a pair of coils magnetically coupled together. The output current of an amplitude-controlled oscillator flows through the series combination of one coil of each pair and the other coil of the comparison inductor is used to supply a signal which is rectified in order to regulate the amplitude of the oscillator. The remaining coil, the other coil of the variable inductor, is rectified to provide an output signal representative of the ratio of the variable inductance to the comparison inductance and also representative of the displacement of the short-circuiting ring of the variable inductance, which is mechanically linked to the control rod of a fuel injector of a diesel engine as required for a system controlling the fuel injector. The oscillator and the rectifiers can conveniently use operational amplifiers of the same type designation.

REFERENCES:
patent: 3046535 (1962-07-01), Philbin et al.
patent: 3384884 (1968-05-01), Var
patent: 3555405 (1971-01-01), Martin
patent: 4080592 (1978-03-01), Zabler
patent: 4083237 (1978-04-01), Levesque
patent: 4132980 (1979-01-01), Zabler

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