Engine with dedicated EGR exhaust port and independent exhaust valve control

摘要

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

主权项

1. An engine assembly comprising:
an engine block defining a cylinder; a crankshaft; an air intake system; an exhaust system; an exhaust gas recirculation system; a cam-actuated intake valve configured to control the flow of fluid from the air intake system to the cylinder; a first cam-actuated exhaust valve configured to control the flow of fluid from the cylinder to the exhaust system; a second cam-actuated exhaust valve configured to control the flow of fluid from the cylinder to the exhaust gas recirculation system; a first cam configured to actuate said first cam-actuated exhaust valve; and a second cam configured to actuate said second cam-actuated exhaust valve, said second cam being phase adjustable relative to the crankshaft independently of the phase of the first cam relative to the crankshaft; wherein the second cam is characterized by a different size or shape than the first cam.