Method and apparatus for controlling duty-cycle type solenoid va

Details Method and apparatus for controlling duty-cycle type solenoid va Method and apparatus for controlling duty-cycle type solenoid va

1998-01-14

2000-08-08

Shaver, Kevin

Fluid handling

Processes

251 64, 25112905, 361178, F16K 3102

Patent

active

060986441

ABSTRACT:
In a method of controlling a duty-cycle type solenoid valve having a valve body that is driven at a controlled duty ratio and a valve seat on which the valve body rests when the solenoid valve is closed, an additional pulse is applied to the solenoid valve upon a lapse of a predetermined time from an ON/OFF switching point at which a level of a driving pulse is changed to drive the valve body in a direction to close the solenoid valve, so as to reduce the speed of the valve body when resting on the valve seat. The additional pulse has the same phase as the driving pulse applied before the ON/OFF switching point, and has a pulse width that is smaller than that of the driving pulse having the same phase. An apparatus for controlling a duty-cycle type solenoid valve is also provided which includes a driving pulse generating device for generating the driving pulse to the duty-cycle type solenoid valve at a predetermined duty ratio, and an additional pulse generating device for generating the additional pulse to the duty-cycle type solenoid valve upon a lapse of a predetermined time from the ON/OFF switching point of the driving pulse generated by the driving pulse generating device.

REFERENCES:
patent: 4546795 (1985-10-01), Okamoto et al.
patent: 4620259 (1986-10-01), Oshizawa
patent: 4766921 (1988-08-01), Williams
patent: 5202813 (1993-04-01), Uota et al.
patent: 5323809 (1994-06-01), Tischer et al.
patent: 5551480 (1996-09-01), Tomatsu et al.
patent: 5749388 (1998-05-01), Elliot et al.

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