US 9,810,143 B2
Exhaust control valve branch communication and wastegate
Gregory Patrick McConville, Ann Arbor, MI (US); Daniel Joseph Styles, Canton, MI (US); and Brad Alan Boyer, Canton, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Mar. 25, 2015, as Appl. No. 14/668,498.
Claims priority of provisional application 62/104,565, filed on Jan. 16, 2015.
Prior Publication US 2016/0208680 A1, Jul. 21, 2016
Int. Cl. F02D 23/00 (2006.01); F02B 37/18 (2006.01); F02B 37/02 (2006.01)
CPC F02B 37/183 (2013.01) [F02B 37/025 (2013.01); Y02T 10/144 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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.
 
12. 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.
 
15. 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.