Method for detecting valve play in a cylinder valve actuated by

Details Method for detecting valve play in a cylinder valve actuated by Method for detecting valve play in a cylinder valve actuated by

1996-08-14

1998-11-10

Rivell, John

Fluid handling

With indicator, register, recorder, alarm or inspection means

2511291, 123 9011, F16K 3700, F16K 3106

Patent

active

058329552

ABSTRACT:
A method is provided for detecting play between a cylinder valve of a piston engine and an electromagnetic actuator that actuates the cylinder valve. The electromagnet has a closing electromagnet and an opening electromagnet, two restoring springs and an armature which is guided to be movable back and forth between the two electromagnets, in each case counter to a force of a respective one of the restoring springs for acting upon the cylinder valve. With the armature held at one of the electromagnets by a holding current I.sub.H, a time interval t.sub.H after turnoff of the holding current I.sub.H at the holding electromagnet until the arrival of the armature at the other one of the electromagnets is measured, and the valve play is calculated by subtracting from the time interval t.sub.H a motion time t.sub.B predetermined by the spring-mass system, comprising the armature, valve body and restoring springs, and a sticking time t.sub.K during which the armature remains at the holding electromagnet after cutoff of the holding current.

REFERENCES:
patent: 4841923 (1989-06-01), Buchl
patent: 5009389 (1991-04-01), Kawamura
patent: 5131624 (1992-07-01), Kreuter et al.
patent: 5199392 (1993-04-01), Kreuter et al.
patent: 5311903 (1994-05-01), Poulin
patent: 5350153 (1994-09-01), Morinigo et al.
patent: 5548263 (1996-08-01), Bulgatz et al.
patent: 5644280 (1997-07-01), Wilson et al.

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