Engine with dedicated EGR exhaust port and independently deactivatable exhaust valves

摘要

An engine assembly includes an engine block defining a cylinder, an exhaust system, and an exhaust gas recirculation system. A first exhaust valve is configured to control the flow of fluid from the cylinder to the exhaust system. A second exhaust valve configured to control the flow of fluid from the cylinder to the exhaust gas recirculation system. The second valve is deactivatable independently of the first valve, thereby enabling EGR flow.

主权项

1. An engine assembly comprising:
an engine block defining a first cylinder having a first exhaust port and a second exhaust port, and a second cylinder having a third exhaust port; an air intake system; an exhaust system in fluid communication with the first exhaust port and the third exhaust port; an exhaust gas recirculation system that provides fluid communication from the second exhaust port to the air intake system, and that is not in direct fluid communication with either the first exhaust port or the third exhaust port; a first exhaust valve configured to control the flow of fluid through the first exhaust port; a second exhaust valve configured to control the flow of fluid through the second exhaust port; a third exhaust valve configured to control the flow of fluid though the third exhaust port; said second exhaust valve being selectively activatable and deactivatable independently of the first exhaust valve and the third exhaust valve.