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 of the cylinder reaches BDC compression stroke of the cylinder;
directing exhaust gases across the first exhaust valve into a first conduit;
recovering heat from the exhaust gases in the first conduit to a liquid; and
returning the exhaust gases after recovering exhaust heat to a second conduit that is in communication with a second 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.
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Citations
20 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 of the cylinder reaches BDC compression stroke of the cylinder; directing exhaust gases across the first exhaust valve into a first conduit; recovering heat from the exhaust gases in the first conduit to a liquid; and returning the exhaust gases after recovering exhaust heat to a second conduit that is in communication with a second exhaust valve of the cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine method, comprising:
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during a first mode, opening a first exhaust valve of a cylinder before a piston of the cylinder reaches BDC compression stroke of the cylinder; flowing exhaust gases from a first combustion in the cylinder across the first exhaust valve; recovering heat from the exhaust gases from the first combustion to a liquid; returning the exhaust gases after recovering exhaust heat from the first combustion to an exhaust passage in communication with a second exhaust valve of the cylinder, the exhaust gases from the first combustion bypassing a turbine; during a second mode, opening a first exhaust valve of a cylinder before a piston of the cylinder reaches BDC compression stroke of the cylinder; flowing exhaust gases from a second combustion in the cylinder across the first exhaust valve; and returning the exhaust gases after recovering exhaust heat from the second combustion to the exhaust passage in communication with the second exhaust valve of the cylinder bypassing a gas-to-liquid heat exchanger. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An engine system, comprising:
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a first exhaust conduit extending from a first exhaust port of a cylinder; a second exhaust conduit extending from a 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 exhaust flow to an intake manifold and the second conduit; a turbocharger located in a second branch of the first exhaust conduit; and a first catalyst and a second catalyst located along the second conduit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification