The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2000
Filed:
Oct. 26, 1998
Shinji Kamimaru, Mitaka, JP;
Mitsunori Ishii, Mitaka, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An electromagnetic valve has a first and a second electromagnetic coil and an armature. The first electromagnetic coil generates a magnetic filed to cause the armature to move a valve for closing. The second electromagnetic coil generates a magnetic filed to cause the armature to move the valve for opening. The first electromagnetic coil is energized to generate the magnetic field. Measurement of time at a first moment is started before the valve is moved to a first position at which the first electromagnetic coil is temporarily de-energized and to output a first signal after a predetermined period of time has passed from the first moment. The temporarily de-energized first electromagnetic coil is energized in response to the first signal. The first electromagnetic coil is de-energized when the valve is fully closed. The second electromagnetic coil is energized to generate the magnetic field after the first electromagnetic coil is de-energized. Measurement of time at a second moment is started before the valve is moved to a second position at which the second electromagnetic coil is temporarily de-energized and to output a second signal after a predetermined period of time has passed from the second moment. The temporarily de-energized second electromagnetic coil energized in response to the second signal. The second electromagnetic coil is de-energized when the valve is fully opened. The first electromagnetic coil is energized after the second magnetic coil is de-energized.