US 12,140,064 B1
Low temperature diesel aftertreatment regeneration strategy
Bryan D. Axe, Farmington Hills, MI (US); Sarah Funk, Canton, MI (US); and Eric Darvin Thomas, Shelby Township, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on May 3, 2024, as Appl. No. 18/654,370.
Int. Cl. F01N 3/20 (2006.01); B01D 46/82 (2022.01); B01D 53/94 (2006.01); F01N 3/023 (2006.01); F01N 3/10 (2006.01); F01N 3/28 (2006.01); F01N 13/00 (2010.01); F02D 41/00 (2006.01); F02D 41/02 (2006.01); F02D 41/40 (2006.01)
CPC F01N 3/208 (2013.01) [B01D 46/82 (2022.01); B01D 53/9422 (2013.01); B01D 53/944 (2013.01); B01D 53/9477 (2013.01); B01D 53/9495 (2013.01); F01N 3/023 (2013.01); F01N 3/106 (2013.01); F01N 3/2006 (2013.01); F01N 3/2803 (2013.01); F01N 13/009 (2014.06); F02D 41/005 (2013.01); F02D 41/029 (2013.01); F02D 41/405 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); B01D 2257/302 (2013.01); B01D 2257/404 (2013.01); B01D 2258/012 (2013.01); F01N 2370/02 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1406 (2013.01); F01N 2900/1606 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of aftertreatment regeneration in a diesel vehicle, comprising:
routing exhaust gases from a diesel engine through an exhaust system within the vehicle, the exhaust system including:
a diesel oxidizing catalyst (DOC) located immediately downstream of the diesel engine;
an upstream selective catalytic reduction (SCR) unit located downstream of the DOC;
a first diesel exhaust fluid (DEF) injector positioned between the DOC and the first SCR and adapted to inject DEF into the exhaust gas;
a diesel particulate filter (DPF) positioned downstream of the first SCR and adapted to collect particulate material from exhaust gas passing therethrough; and
an exhaust system controller in communication with an engine controller, a plurality of sensors within the exhaust system and the first DEF injector; and
initiating a nitrogen dioxide (NO2) based aftertreatment regeneration of the DPF by:
at least partially de-activating, with the exhaust system controller, the first DEF injector and the upstream SCR, such that NO2 is allowed to pass through the upstream SCR;
increasing, with the exhaust system controller via communication with the engine controller, levels of Nitric Oxide (NO) within exhaust gas from the engine;
establishing and maintaining an target exhaust gas temperature (EGT) at an inlet of the DPF (DPF inlet temperature) and an target EGT at an inlet of the DOC (DOC inlet temperature) by actively controlling, with the exhaust system controller, via communication with the engine controller, combustion characteristics of the engine;
converting, with the DOC, NO within the exhaust gas entering the DOC to NO2; and
converting solid carbon-based particulate matter that has accumulated within the DPF to gaseous carbon dioxide (CO2) and NO by using NO2 as an oxidant.