Linear solenoid valve control device

Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing

Reexamination Certificate

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Details

C137S246000

Reexamination Certificate

active

06874525

ABSTRACT:
Disclosed is a control device for controlling a two-way linear solenoid valve (60) including a pressure regulating port (60p) which communicates with a hydraulic circuit side, a drain port (60d) which communicates with a drain side, a plunger (61) which controls the state of communication between the pressure regulating port and drain port, and a coil (70) which drives the plunger in accordance with an exciting current. The control device has a current generator (65) which supplies the coil with the exciting current corresponding to a duty signal; and a microcomputer (1). The microcomputer determines whether or not a preset foreign matter removal starting condition for removing foreign matter accumulated in the ports has been established. When the foreign matter removal starting condition is established, the microcomputer sets a variation pattern for a current command value in the form of a rectangular wave having a preset maximum current command value (A1) and a preset minimum current command value (A0), and transmit to the current generator a first duty signal corresponding to the maximum current command value and a second duty signal corresponding to the minimum current command value. The microcomputer further determines whether or not a preset foreign matter removal completion condition has been established. When the foreign matter removal completion condition is established, the microcomputer terminates the setting of the rectangular wave variation pattern.

REFERENCES:
patent: 3735771 (1973-05-01), Panissidi
patent: 4281678 (1981-08-01), Claycomb
patent: 6592099 (2003-07-01), Yamamoto et al.
patent: 6655404 (2003-12-01), Hilaire
patent: 6729601 (2004-05-01), Freisinger et al.
patent: 2629512 (1997-04-01), None
patent: 2836789 (1998-10-01), None

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