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US 9,810,143 B2Granted
Exhaust control valve branch communication and wastegate
AssigneeFord Global Technologies, LLC
InventorsGregory Patrick McConville, Daniel Joseph Styles, Brad Alan Boyer
Life of this patent
Estimating the term…
Abstract
Methods and systems for adjusting a branch communication and wastegate valve in a dual scroll turbocharger system are provided. In one example, a method may include adjusting the branch communication and wastegate valve in a passage connecting a first scroll, a second scroll, and a wastegate passage may control an amount of exhaust flow to a turbine during certain engine operating conditions.
Claims18
A method, comprising:
- adjusting a valve positioned in a passage connecting a first scroll and a second scroll of a turbine and connected to a wastegate passage flowing exhaust around the turbine into a first position to increase an amount of exhaust flow to the turbine when a turbine speed is less than a threshold and during a first load condition of the engine, the first position including the valve being completely closed to each of the first scroll, the second scroll, and the wastegate passage;
- adjusting the valve into a second position to decrease the amount of exhaust flow to the turbine when engine speed is less than a threshold engine speed and during a second load condition of the engine, the second position including the valve being partially opened to each of the first and second scrolls, and completely opened to the wastegate passage;
- and
- adjusting the valve from the first position to a third position, without passing through the second position, when engine speed is greater than the threshold engine speed and during a third load condition of the engine, the third position including the valve being completely opened to each of the first scroll and the second scroll, and completely closed to the wastegate passage.
1 more element
A dual scroll turbocharger system, comprising:
- a first scroll;
- a second scroll, fluidically separated from the first scroll via a dividing wall arranged between the first scroll and the second scroll;
- a passage positioned within the dividing wall, fluidically bridging the first scroll and the second scroll, and in fluidic communication with a point downstream from a turbine;
- a valve positioned within the passage and movable between selected positions;
- and
- a controller programmed to adjust the valve between selected positions, including:
- a first position wherein the valve is closed to each of the first and second scrolls, and closed to the point downstream from the turbine;
- a second position wherein the valve is partially opened to each of the first and second scrolls, and completely opened to the point downstream from the turbine;
- and
- a third position wherein the valve is opened completely to each of the first and second scrolls, and closed to the point downstream from the turbine, and when the valve is moved between the first and third positions, the valve is maintained closed to the point downstream from the turbine without passing through the second position and opening communication between the point downstream from the turbine and each of the first scroll and the second scroll.
7 more elements
An engine system comprising:
- a first passage for fluid conveyance from a first set of combustion chambers to a turbine;
- a second passage for fluid conveyance from a second set of combustion chambers to the turbine, and separated from the first passage by a dividing wall;
- a third passage for fluid conveyance from the first passage and the second passage to a location downstream from the turbine;
- a valve positioned in the dividing wall;
- and
- a controller programmed to adjust the valve between selected positions, including:
- a first position wherein the valve is closed to each of the first and second passages, and closed to the location downstream from the turbine when boost pressure is less than a desired pressure and engine speed is less than a threshold engine speed;
- a second position wherein the valve is opened partially to each of the first and second passages, and completely opened to the location downstream from the turbine when boost pressure is greater than the desired pressure and engine speed is less than the threshold engine speed;
- a third position wherein the valve is opened completely to each of the first and second passages, and partially opened to the location downstream from the turbine when boost pressure is greater than the desired pressure and engine speed is greater than the threshold engine speed;
- and
- a fourth position wherein the valve is opened completely to each of the first and second passages, and closed to the location downstream from the turbine when boost pressure is less than the desired pressure and engine speed is greater than the threshold engine speed.
8 more elements
Dependencies are inferred from the claim text.