| 摘要 |
<p>A four-stroke reciprocating internal combustion engine (10) includes at least one combustion chamber (19) defined by a cylinder (11), a piston (16) and a cylinder head (17). Each combustion chamber (19) is in fluid communication with at least one intake port (18) containing an intake valve (20) and an intake flow motion generating device for creating an intake flow near the intake port (18) and an exhaust port (22) containing an exhaust valve (24) that opens during the intake stroke at part load and an exhaust flow motion generating device for creating an exhaust flow near the exhaust port (22). An engine controller processes signals from at least one sensor and outputs a control signal to a variable valve lift and timing system for operating each intake and exhaust valve such that an exhaust residual flow is inducted through at least one exhaust port (22) into the combustion chamber (19) and air or air/fuel mixture is simultaneously inducted through at least one intake port (18) into the combustion chamber (19). This produces a stratified exhaust gas and air-fuel mixture that includes: (i) recirculated exhaust gas that rotates about a vortex axis that extends parallel to the axis of the piston (16) in a first portion of the combustion chamber (19) adjacent the exhaust port (20) and (ii) an air/fuel mixture that rotates about a vortex axis that extends parallel to the axis of the piston (16) in a second portion of the combustion chamber (19) adjacent the intake port (20).</p> |
