Back to results
US 8,069,663 B2Granted
Method and system for turbocharging an engine
AssigneeFord Global Technologies, LLC
InventorsJoseph Norman Ulrey, Ross Dykstra Pursifull
Life of this patent
Estimating the term…
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.
Claims20
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.
2 more elements
An engine method, comprising:
- 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.
7 more elements
An engine system, comprising:
- 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.
5 more elements
Dependencies are inferred from the claim text.