US 12,012,880 B2
System and methods for controlling flow distribution in an aftertreatment system
Sriram Srinivasan, Greenwood, IN (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
Filed on Feb. 15, 2022, as Appl. No. 17/672,068.
Application 17/672,068 is a division of application No. 15/605,680, filed on May 25, 2017, granted, now 11,286,835.
Prior Publication US 2022/0170406 A1, Jun. 2, 2022
Int. Cl. F01N 11/00 (2006.01); F01N 3/035 (2006.01); F01N 3/20 (2006.01)
CPC F01N 11/002 (2013.01) [F01N 3/035 (2013.01); F01N 3/2066 (2013.01); F01N 2560/06 (2013.01); F01N 2560/07 (2013.01); F01N 2560/08 (2013.01); F01N 2900/1406 (2013.01); F01N 2900/1411 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An aftertreatment system, comprising:
a selective catalytic reduction (SCR) system including at least one catalyst;
a particulate filter fluidly coupled to the SCR system;
a particulate filter out pressure sensor operatively coupled to an outlet of the particulate filter, the particulate filter out pressure sensor configured to measure a value of a pressure at the outlet of the particulate filter;
a temperature sensor;
an ambient pressure sensor; and
a controller communicatively coupled with the particulate filter out pressure sensor, the controller configured to:
determine a first output value from the particulate filter out pressure sensor, the first output value indicative of the value of the pressure at the outlet of the particulate filter;
determine a first temperature output value from the temperature sensor, the first temperature output value indicative of a temperature of the SCR system;
determine a second output value from the ambient pressure sensor, the second output value indicative of a value of an ambient pressure; and
estimate an exhaust air mass-flow output from the aftertreatment system using the first output value from the particulate filter out pressure sensor, the first temperature output value from the temperature sensor, and the second output value from the ambient pressure sensor.