초록 ▼

One way of reducing nitrogen oxide emissions from an engine having a plurality of combustion chambers is through exhaust gas recirculation. The present invention provides an apparatus for exhaust gas recirculation by causing at least a selected subset of the combustion chambers to be operated in a f

One way of reducing nitrogen oxide emissions from an engine having a plurality of combustion chambers is through exhaust gas recirculation. The present invention provides an apparatus for exhaust gas recirculation by causing at least a selected subset of the combustion chambers to be operated in a four-stroke reverse flow motoring mode of operation while the remaining combustion chambers are operated is a normal four-stroke mode. In the four-stroke reverse flow motoring mode of operation, exhaust gas is inducted into the combustion chamber of a selected subset of combustion chambers. The exhaust gas is then compressing and expanded in the combustion chambers. Cooling of the exhaust gas is achieved during the compression and expansion strokes. The cooled exhaust gas is then expelled from the combustion chambers to be mixed with fresh charge air.

대표청구항 ▼

An apparatus adapted for use with an engine for exhaust gas recirculation, the engine including a plurality of combustion chambers, an intake port and an exhaust port for each combustion chamber, and a piston being reciprocally movable in each of the combustion chambers between a top dead center pos

An apparatus adapted for use with an engine for exhaust gas recirculation, the engine including a plurality of combustion chambers, an intake port and an exhaust port for each combustion chamber, and a piston being reciprocally movable in each of the combustion chambers between a top dead center position and a bottom dead center position forming an intake stroke, movable between the bottom dead center position and the top dead center position forming a compression stroke, movable between a top dead center position and a bottom dead center position forming an expansion stroke, and movable between the bottom dead center position and the top dead center position forming an exhaust stroke, the apparatus comprising: flow control means including intake means for selectively blocking and permitting flow into and away from each of the combustion chambers, and exhaust means for selectively blocking and permitting flow into and away from each of the combustion chambers; means for actuating each of the intake means and the exhaust means independently in response to a control signal; and intake conducting means operatively connected to the intake means for conducting flow into and away from the combustion chambers; exhaust conducting means operatively connected to the exhaust means for conducting flow into and away from the combustion chambers; electronic control means responsive to sensed operating parameters of the engine for causing the exhaust means of a selected subset of combustion chambers to be initiated inducting exhaust gas into the combustion chamber from the exhaust conducting means, compressing the exhaust gas in the combustion chamber, expanding the exhaust gas in the combustion chamber, and expelling the exhaust gas into the intake conducting means by initiation of the intake means.