ELECTROMAGNETIC SWITCHING-VALVE POSITION DETECTION SYSTEM

WIPO Patent Application WO/2019/221230

A1

This electromagnetic switching-valve position detection system is provided with: a current control circuit that obtains a smoothed direct current by smoothing a current from a power source via a rectifier bridge diode and a primary-side smoothing capacitor, that transmits the direct current to the secondary side by a switching transformer as an alternating current of pulse waves from a switching element where switching is controlled in accordance with a pulse signal from a pulse signal generation device, and that outputs same as a direct current that has been smoothed via a secondary-side diode and a secondary-side capacitor; a carrier wave generation device for superimposing high-frequency carrier waves for position detection onto signal waves of a current command; and a detection unit for extracting a frequency component of the carrier waves from a voltage feedback signal of a solenoid, and detecting a voltage amplitude thereof to obtain an amplitude signal. A control unit further comprises: a position determination unit for determining a valve spool position on the basis of the amplitude signal and preset criterion reference values corresponding to respective valve spool positions, and outputting a determination signal; and a determination circuit for outputting a valve position signal on the basis of the determination signal.

JPH063237	[Name of invention] Drainage plug control device
JPS60146977	GAS BLOCK VALVE
JP6793120	Control element with buckling member

NAGANO TAKU (JP)

PCT/JP2019/019502

November 21, 2019

May 16, 2019

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YUKEN KOGYO CO LTD (JP)

F16K31/06; F16K37/00; H01F7/16; H01F7/18

JPH0512703U	1993-02-19
JP2019134625A	2019-08-08

HANAMURA, Futoshi (JP)

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