| 摘要 |
The present invention provides a method for controlling a closing operation of an exhaust valve ( 11 ) in an internal combustion engine. A current position X<SUB>0 </SUB>of the exhaust valve ( 11 ) and a rotation speed Ne of the internal combustion engine are determined, and on the basis of the current position X<SUB>0 </SUB>and rotation speed Ne, a time T<SUB>0 </SUB>at which a piston arrives at the current position X<SUB>0 </SUB>of the exhaust valve ( 11 ) is calculated. The closing operation of the exhaust valve ( 11 ) is then started before this arrival time T<SUB>0</SUB>. Next, a time T<SUB>1 </SUB>at which the gap between the exhaust valve ( 11 ) and piston reaches a first predetermined value hc 1 is calculated, and when this time T<SUB>1 </SUB>arrives, the closing operation of the exhaust valve ( 11 ) is stopped temporarily. A time T<SUB>2 </SUB>at which the piston arrives at the stopping position X<SUB>1 </SUB>of the exhaust valve ( 11 ) is then calculated, and the closing operation of the exhaust valve ( 11 ) is resumed before this arrival time T<SUB>2</SUB>.
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