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US 8,739,527 B2Granted
Method and system for turbocharging an engine
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
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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.
Claims12
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.
1 more element
An engine system, comprising:
- 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.
6 more elements
Dependencies are inferred from the claim text.