US 11,898,483 B2
Systems and methods for operating passive nitrogen oxide adsorbers in exhaust aftertreatment systems
Jinyong Luo, Columbus, IN (US); Xiaobo Song, Columbus, IN (US); Xing Jin, Columbus, IN (US); David Schmidt, Indianapolis, IN (US); Lu Qiu, Columbus, IN (US); Lisa A. Orth-Farrell, Columbus, IN (US); Ying Yuan, Columbus, IN (US); Manik Narula, Columbus, IN (US); and Lars K. Henrichsen, Columbus, IN (US)
Assigned to Cummins Inc., Columbus, IN (US)
Filed by CUMMINS INC., Columbus, IN (US)
Filed on May 19, 2022, as Appl. No. 17/748,559.
Application 17/748,559 is a continuation of application No. PCT/US2020/060718, filed on Nov. 16, 2020.
Claims priority of provisional application 62/938,499, filed on Nov. 21, 2019.
Prior Publication US 2022/0275747 A1, Sep. 1, 2022
Int. Cl. F01N 3/28 (2006.01); B01D 53/02 (2006.01); B01D 53/94 (2006.01); F01N 3/08 (2006.01); F01N 9/00 (2006.01); F02D 29/06 (2006.01)
CPC F01N 3/2892 (2013.01) [B01D 53/02 (2013.01); B01D 53/9418 (2013.01); B01D 53/9431 (2013.01); B01D 53/9481 (2013.01); B01D 53/9495 (2013.01); F01N 3/0842 (2013.01); F01N 3/2803 (2013.01); F01N 9/00 (2013.01); F02D 29/06 (2013.01); B01D 2253/108 (2013.01); B01D 2253/112 (2013.01); B01D 2253/1124 (2013.01); B01D 2257/404 (2013.01); B01D 2259/4566 (2013.01); F01N 2370/04 (2013.01); F01N 2900/10 (2013.01); F01N 2900/1602 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A system, comprising:
a catalyst for receiving and treating exhaust gas generated by an engine;
a passive NOx adsorber (PNA) positioned upstream of the catalyst and fluidly coupled with the catalyst;
a bypass valve positioned upstream of the catalyst and the PNA; and
a controller configured to:
determine that an effectiveness of the catalyst in reducing NOx is below a threshold level,
in response to determining that the effectiveness of the catalyst in reducing NOx is below the threshold level, control the bypass valve to direct exhaust gas to the PNA,
subsequent to controlling the bypass valve to direct exhaust gas to the PNA, determine that the effectiveness of the catalyst is no longer below the threshold level, and
in response to determining that the effectiveness of the catalyst is no longer below the threshold level:
continue to control the bypass valve to direct exhaust gas to the PNA for a predetermined duration and increase a load on the engine by mechanically engaging a generator with the engine, and utilize resulting electrical energy generated by the generator to charge a battery system; and
after PNA regeneration conditions are met upon an elapse of the predetermined duration, control the bypass valve to direct exhaust gas to the catalyst bypassing the PNA.