Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1998-10-26
2000-02-15
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, 25112915, 335268, 361167, F01L 904
Patent
active
060240598
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.
REFERENCES:
patent: 5201296 (1993-04-01), Wunning et al.
patent: 5671705 (1997-09-01), Matsumoto et al.
patent: 5775276 (1998-07-01), Yanai et al.
patent: 5782211 (1998-07-01), Kamimaru
Ishii Mitsunori
Kamimaru Shinji
Fuji Jukogyo Kabushiki Kaisha
Lo Weilun
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