| 摘要 |
An engine is disclosed. The engine has an engine block at least partially forming a combustion chamber, and a piston located to reciprocate within the combustion chamber. The engine also has an exhaust valve fluidly connected to the combustion chamber, and a filter assembly fluidly connected to the exhaust valve. The engine further has a controller configured to open the exhaust valve during a portion of an intake stroke of the piston and a portion of a compression stroke of the piston to reduce an amount of air available for combustion during an ensuing power stroke, wherein the exhaust valve opens after a majority of the intake stroke is complete and closes during a first half of the compression stroke.
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