Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1996-08-08
1998-08-11
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, F01L 904
Patent
active
057913056
ABSTRACT:
A method is provided for monitoring a cylinder valve which is actuated by an electromagnetic actuator including an electromagnet having a magnetic core presenting a pole face and a coil wound around the magnetic core, a return spring and an armature that can be moved by the electromagnet in a direction toward the pole face counter to a force of the return spring for acting upon the cylinder valve. The method includes: measuring a value of one of (a) a time until current in the coil drops to a predetermined lower value after a switching of the current flowing through the coil, (b) a voltage at the coil subsequent to the switching of the current to the coil, (c) the voltage at the coil at a time of maximum approach of the armature to the pole face, and (d) the voltage at the coil at a time subsequent to the time of maximum approach of the armature to the pole face; comparing the measured value to a predetermined value; and generating a signal if a deviation is detected between the measured value and the predetermined value.
REFERENCES:
patent: 4794891 (1989-01-01), Knobloch
patent: 4823825 (1989-04-01), Buchl
patent: 5596956 (1997-01-01), Ogawa et al.
Kather Lutz
Schmitz Guenter
Schrey Ekkehard
FEV Motorentechnik GmbH & Co KG
Lo Weilun
LandOfFree
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