US 12,070,721 B1
Engine cold start system and method
Jason Martz, Canton, MI (US); Paul Joseph Tennison, West Bloomfield, MI (US); Brien Fulton, Bloomfield Hills, MI (US); Michiel J. Van Nieuwstadt, Ann Arbor, MI (US); Eric Kurtz, Dearborn, MI (US); and Daniel Joseph Styles, Canton, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Oct. 3, 2023, as Appl. No. 18/479,993.
Int. Cl. B01D 53/94 (2006.01); F01N 3/10 (2006.01); F01N 3/20 (2006.01); F01N 3/28 (2006.01); F01N 3/32 (2006.01); F01N 3/36 (2006.01); F02D 41/02 (2006.01)
CPC B01D 53/9495 (2013.01) [B01D 53/9418 (2013.01); B01D 53/9431 (2013.01); B01D 53/944 (2013.01); F01N 3/106 (2013.01); F01N 3/2013 (2013.01); F01N 3/2066 (2013.01); F01N 3/2892 (2013.01); F01N 3/32 (2013.01); F01N 3/36 (2013.01); F02D 41/024 (2013.01); B01D 2251/2067 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/50 (2013.01); B01D 2255/91 (2013.01); B01D 2257/404 (2013.01); B01D 2258/012 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/08 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1602 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An exhaust system for an internal combustion engine, comprising:
a combustor air pump selectively supplying air to a combustor positioned along a first passage;
a second passage arranged in parallel with the first passage;
a three-way valve coupled to the first passage and the second passage downstream of the combustor;
a third passage positioned downstream of the three-way valve;
a fourth passage positioned in parallel with the third passage, the third passage and the fourth passage fluidically coupled to a fifth passage, the fifth passage fluidically coupled to an engine exhaust passage;
a passive NOx absorber (PNA) positioned along the engine exhaust passage;
a selective catalyst reduction (SCR) catalyst positioned along the engine exhaust passage downstream of the PNA; and
a NOx sensor positioned along the engine exhaust passage downstream of the SCR.