ENGINE WITH DEDICATED EGR EXHAUST PORT AND INDEPENDENT EXHAUST VALVE CONTROL
First Claim
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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.
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Abstract
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.
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Citations
10 Claims
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1. An engine assembly comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. An engine assembly comprising:
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an engine block defining a cylinder having an intake port, a first exhaust port, and a second exhaust port; a crankshaft; an air intake system in fluid communication with the intake port; an exhaust system in fluid communication with the first exhaust port and not in fluid communication with the second 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 fluid communication with the first exhaust port; a first cam-actuated exhaust valve configured to control the flow of fluid through the first exhaust port; a second cam-actuated exhaust valve configured to control the flow of fluid through the second exhaust port; 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. - View Dependent Claims (6, 7, 8)
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9. A method comprising:
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providing an engine having a block defining a cylinder having a first exhaust port, a second exhaust port, a first exhaust valve controlling fluid flow through the first exhaust port, a second exhaust valve controlling fluid flow through the second exhaust port, an air intake system, an exhaust system providing fluid communication from the first exhaust port to the atmosphere, an exhaust gas recirculation system providing fluid communication from the second exhaust port to the air intake system, said exhaust gas recirculation system and said exhaust system being separated and not coextensive with one another; and adjusting the amount of exhaust gas entering the exhaust gas recirculation system by adjusting the timing of the second exhaust valve relative to the first exhaust valve. - View Dependent Claims (10)
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Specification