Method and system for turbocharging an engine
First Claim
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1. An engine method, comprising:
- opening a first exhaust valve of a cylinder before a piston reaches BDC expansion stroke of the cylinder;
directing exhaust gases across the first exhaust valve into a first conduit and a turbocharger turbine; and
recovering heat from the exhaust gases in the first conduit to a liquid, and then returning cooled exhaust gases to a second conduit that is in communication with a second, later-opening exhaust valve of the cylinder.
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Abstract
A method for improving operation of a turbocharged engine is presented. In one embodiment, the method may reduce engine emissions and improve engine efficiency during an engine start.
21 Citations
12 Claims
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1. An engine method, comprising:
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opening a first exhaust valve of a cylinder before a piston reaches BDC expansion stroke of the cylinder; directing exhaust gases across the first exhaust valve into a first conduit and a turbocharger turbine; and recovering heat from the exhaust gases in the first conduit to a liquid, and then returning cooled exhaust gases to a second conduit that is in communication with a second, later-opening exhaust valve of the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine system, comprising:
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a first cam profile in communication with a first exhaust valve in a first exhaust port of a cylinder; a second cam profile in communication with a second valve in a second exhaust port of the cylinder; a first exhaust conduit extending from the first exhaust port of the cylinder; a second exhaust conduit extending from the second exhaust port of the cylinder, the second exhaust port isolated from the first exhaust port; a gas-to-liquid heat exchanger located in a first branch of the first exhaust conduit, an outlet of the gas-to-liquid heat exchanger directed to an intake manifold and the second conduit; a turbocharger located in a second branch of the first exhaust conduit; a first catalyst and a second catalyst located along the second conduit; and further comprising a first valve located downstream of the turbocharger in a direction of exhaust flow, and a second valve located between the gas-to-liquid heat exchanger and the intake manifold, and a third valve located between the gas-to-liquid heat exchanger and the second conduit. - View Dependent Claims (9, 10, 11, 12)
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Specification