US 11,719,151 B2
Systems and methods for diagnosis of NOx storage catalyst
Michael Haas, Columbus, IN (US); Krishna Kamasamudrum, Columbus, IN (US); and Ashok Kumar, Columbus, IN (US)
Assigned to Cummins Inc., Columbus, IN (US)
Filed by Cummins Inc., Columbus, IN (US)
Filed on Jul. 25, 2022, as Appl. No. 17/872,926.
Application 17/872,926 is a continuation of application No. 17/247,506, filed on Dec. 14, 2020, granted, now 11,396,838.
Application 17/247,506 is a continuation of application No. 16/138,453, filed on Sep. 21, 2018, granted, now 10,865,689, issued on Dec. 15, 2020.
Prior Publication US 2022/0356833 A1, Nov. 10, 2022
Int. Cl. F01N 11/00 (2006.01); F01N 9/00 (2006.01); F01N 3/08 (2006.01); F02D 41/02 (2006.01)
CPC F01N 11/002 (2013.01) [F01N 9/005 (2013.01); F01N 11/007 (2013.01); F01N 3/0814 (2013.01); F01N 3/0842 (2013.01); F01N 2550/02 (2013.01); F01N 2550/03 (2013.01); F01N 2560/026 (2013.01); F01N 2570/14 (2013.01); F01N 2900/1614 (2013.01); F02D 41/0245 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a controller configured to:
perform an enable operation responsive to receiving information indicative of an enable parameter, the enable operation comprising:
determining a predicted downstream NOx value of an exhaust gas stream exiting a NOx storage catalyst;
determining a downstream NOx value of the exhaust gas stream exiting the NOx storage catalyst;
determining an error between the predicted downstream NOx value and the determined downstream NOx value;
comparing the error to an error threshold; and
determining that the NOx storage catalyst is in good health responsive to determining that the error does not exceed the error threshold; and
perform a disable operation responsive to receiving information indicative of a disable parameter comprising a temperature of the exhaust gas stream indicating a warm engine operating condition, the disable operation causing a deactivation of at least a portion of the controller.