US 12,188,396 B2
Systems and methods for reactive regeneration of selective catalytic reduction catalysts
Jinqian Gong, Columbus, IN (US); and Anurag Kumra, Columbus, IN (US)
Assigned to CUMMINS EMISSION SOLUTIONS INC., Columbus, IN (US)
Appl. No. 17/781,040
Filed by CUMMINS EMISSION SOLUTIONS INC., Columbus, IN (US)
PCT Filed Nov. 24, 2020, PCT No. PCT/US2020/061968
§ 371(c)(1), (2) Date May 30, 2022,
PCT Pub. No. WO2021/113119, PCT Pub. Date Jun. 10, 2021.
Claims priority of provisional application 62/943,328, filed on Dec. 4, 2019.
Prior Publication US 2023/0003151 A1, Jan. 5, 2023
Int. Cl. F01N 3/00 (2006.01); B01D 53/94 (2006.01); B01J 38/02 (2006.01); F01N 3/20 (2006.01)
CPC F01N 3/208 (2013.01) [B01D 53/9418 (2013.01); B01D 53/9495 (2013.01); B01J 38/02 (2013.01); F01N 3/2006 (2013.01); F01N 2900/1602 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A controller for controlling regeneration of a selective catalytic reduction (SCR) catalyst of an aftertreatment system, the controller configured to:
cause increase in a SCR catalyst temperature of the SCR catalyst to a first regeneration temperature, the first regeneration temperature being lower than a high regeneration temperature that is equal to or greater than 500 degrees Celsius;
determine an amount of ammonia slip downstream of the SCR catalyst; and
cause increase in the SCR catalyst temperature to a second regeneration temperature greater than the first regeneration temperature but less than the high regeneration temperature based on the determined amount of ammonia slip.