US 9,810,122 B2
Engine exhaust temperature control
Douglas Raymond Martin, Canton, MI (US); and John Eric Rollinger, Troy, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Jun. 22, 2015, as Appl. No. 14/746,616.
Prior Publication US 2016/0369687 A1, Dec. 22, 2016
Int. Cl. F02B 33/44 (2006.01); F01N 3/20 (2006.01); F02B 37/10 (2006.01); F02B 37/16 (2006.01); F02B 39/12 (2006.01); F02D 13/02 (2006.01); F02D 41/00 (2006.01); F02D 41/02 (2006.01)
CPC F01N 3/2066 (2013.01) [F01N 3/204 (2013.01); F01N 3/2046 (2013.01); F02B 37/105 (2013.01); F02B 37/166 (2013.01); F02B 37/168 (2013.01); F02B 39/12 (2013.01); F02D 13/0269 (2013.01); F02D 41/0007 (2013.01); F01N 2610/03 (2013.01); F02B 2275/32 (2013.01); F02D 2041/0265 (2013.01); Y02T 10/142 (2013.01); Y02T 10/144 (2013.01); Y02T 10/26 (2013.01)] 16 Claims
OG exemplary drawing
 
7. An engine operating method, comprising:
in response to a temperature of exhaust of a Miller cycle engine being greater than an exhaust component degradation threshold temperature, injecting an amount of fuel in an exhaust system of the Miller cycle engine upstream of a turbine while operating the Miller cycle engine, the turbine arranged upstream of a catalyst in the exhaust system;
introducing an amount of air from an intake system of the Miller cycle engine to a location in the exhaust system upstream of the turbine via a second passage;
at the location in the exhaust system upstream of the turbine, mixing the amount of fuel injected in the exhaust system upstream of the turbine with the amount of air introduced from the intake system via the second passage; and
introducing an amount of air from the intake system to a location downstream of the turbine and upstream of the catalyst via a first passage, the amount of air introduced via the first passage based on the amount of fuel injected in the exhaust system upstream of the turbine and the amount of air introduced from the intake system via the second passage.