Pumped EGR system
AssigneeThe United States of America as represented by the Administrator of the Environmental Protection Agency
InventorsKarl H. Hellman, Charles L. Gray, Jr.
Life of this patent
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Abstract
An exhaust gas recirculation system for an internal combustion engine includes an exhaust manifold and at least one exhaust flow control valve located between the engine and the exhaust manifold. The exhaust flow control valve diverts a portion of the exhaust gas from each cycle of one cylinder and feeds that diverted portion to another of the cylinders through an exhaust gas recirculation passage, bypassing the exhaust manifold, whereby an exhaust stroke of a piston within the one cylinder serves to pump exhaust gas through the exhaust flow control valve in another cylinder.
Claims10
An exhaust gas recirculation system for an internal combustion engine having a plurality of cylinders, each of the cylinders defining a combustion chamber and having an exhaust valve and an intake valve, said exhaust system comprising:
- exhaust manifold means for receiving exhaust gas from each of said cylinders through exhaust lines respectively connected to exhaust valves of said cylinders;
- and
- an exhaust flow control valve associated with at least one of said cylinders, said exhaust flow control valve controlling feed of a portion of the exhaust gas from each cycle of at least said one cylinder to another of the cylinders through an exhaust gas recirculation passage, bypassing said exhaust manifold, whereby an exhaust stroke of a piston within said one cylinder serves to pump exhaust gas through said exhaust flow control valve into said another cylinder;
- and
- wherein said exhaust line and said exhaust gas recirculation passage are joined through said exhaust flow control valve which diverts a portion of the exhaust gas received from said one cylinder to the exhaust gas recirculation passage.
An exhaust gas recirculation system for an internal combustion engine comprising:
- a plurality of cylinders, each of the cylinders defining a combustion chamber and having at least first and second intake valves and first and second exhaust valves;
- exhaust manifold means for receiving exhaust gas from each of said cylinders through exhaust lines respectively connected to exhaust valves of said cylinders;
- an exhaust gas re circulation passage, bypassing said exhaust manifold, and connecting one of said exhaust valves of at least one of said cylinders with an intake valve of another of said cylinders, whereby an exhaust stroke of a piston within said one cylinder serves to pump a portion of the exhaust gas from each cycle of said one cylinder exhaust gas through said exhaust gas recirculation passage into another of said cylinders;
- a first camshaft operating a first plurality of said exhaust valves and said intake valves;
- a second camshaft operating a second plurality of said exhaust valves and said intake valves;
- and
- timing means for controlling the relative phasing of said first and second camshafts;
- and
- wherein one of said exhaust lines connects the first exhaust valve of said one cylinder with said exhaust manifold and said exhaust gas recirculation passage connects the second exhaust valve of said one cylinder with said another cylinder, through an intake valve of said another cylinder.
Dependencies are inferred from the claim text.