Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1997-11-17
1999-03-30
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
25112901, 25112918, F01L 904
Patent
active
058875530
ABSTRACT:
A device for electromagnetic actuation of a charge change valve for internal combustion engines has an actuator unit that cooperates with the charge change valve and is arranged in a cylinder head of the engine. The actuator has an armature and two switch magnets located on either side of the armature, with the switch magnets holding the charge change valve in an open or closed position. The actuator unit is mounted to float in the cylinder head, with a play-compensating device with a play-compensating piston having a first and second pressure chambers being provided on or in the side of the actuator unit facing away from the charge change valve. The first pressure chamber is controlled as a function of engine pressure and the second pressure chamber is connected by a check valve with the first pressure chamber. Pressure medium can be drained from the second pressure chamber through a throttle line between the play-compensating piston and a cylinder surrounding said piston.
REFERENCES:
patent: 5117213 (1992-05-01), Kreuter et al.
patent: 5131624 (1992-07-01), Kreuter et al.
patent: 5636601 (1997-06-01), Moriya et al.
patent: 5762035 (1998-06-01), Schebitz
Ballmann Rainer
Enderle Christian
Wurster Paul
Daimler-Benz AG
Lo Weilun
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