Exhaust valve drive control method and device

Details Exhaust valve drive control method and device Exhaust valve drive control method and device

2007-03-20

2007-03-20

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090160

Reexamination Certificate

active

11154415

ABSTRACT:
The present invention provides a method for controlling a closing operation of an exhaust valve (11) in an internal combustion engine. A current position X0of the exhaust valve (11) and a rotation speed Ne of the internal combustion engine are determined, and on the basis of the current position X0and rotation speed Ne, a time T0at which a piston arrives at the current position X0of the exhaust valve (11) is calculated. The closing operation of the exhaust valve (11) is then started before this arrival time T0. Next, a time T1at which the gap between the exhaust valve (11) and piston reaches a first predetermined value hc1is calculated, and when this time T1arrives, the closing operation of the exhaust valve (11) is stopped temporarily. A time T2at which the piston arrives at the stopping position X1of the exhaust valve (11) is then calculated, and the closing operation of the exhaust valve (11) is resumed before this arrival time T2.

REFERENCES:
patent: 6092495 (2000-07-01), Hackett
patent: 2002/0157650 (2002-10-01), Gaessler et al.
patent: 2004/0003787 (2004-01-01), Allen
patent: 1 260 680 (2002-11-01), None
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patent: 2001280109 (2001-10-01), None
patent: 2003-328713 (2003-11-01), None
European Search Report for Serial No. EP 05 01 2548 dated Nov. 23, 2006.

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