Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1988-09-02
1990-01-16
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324166, G01P 348
Patent
active
048946133
ABSTRACT:
A speed detector, for use with a tone wheel having metal teeth, employs two coils positioned in offset relation near the tone wheel for interacting with the tone wheel teeth and thus changing their respective inductances. One coil is in a phase sense oscillator circuit and the other is in a tuned sensor network. The oscillator is coupled to, and drives, the tuned network. The change in coil inductances effects a shifting of the phase of the output signal from the oscillator relative to the output signal from the tuned network. The phase sequence of those two output signals also reverses itself cyclically as the tone wheel rotates, and a phase reversal detector detects that reversal and uses the event to provide timing reference pulses for a final determination of speed. The speed detector has a hysteresis circuit connected between the phase reversal detector and the oscillator or the tuned network for automatically increasing the apparent phase shift between the oscillator and tuned circuit output signals to minimize invalid timing signals as a result of limited backward motion of the tone wheel. The hysteresis circuit includes a resistor and preferably a series diode.
REFERENCES:
patent: 3641535 (1972-02-01), Knopf
patent: 3716787 (1973-02-01), Hammond
patent: 3721859 (1973-03-01), Blanyer
patent: 3728565 (1973-04-01), O'Callaghan
patent: 3750128 (1973-07-01), Sapir
patent: 3758858 (1973-09-01), McCue
patent: 4161693 (1979-07-01), Carlson
patent: 4764685 (1988-08-01), Bleckmann et al.
Edmonds Warren S.
Eisenzopf Reinhard J.
Hamilton Standard Controls Inc.
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