US 11,898,480 B2
Methods and systems for removing deposits in an aftertreatment system to minimize visible smoke emissions
Todd C. Bouws, Columbus, IN (US); Ankit Raghunath Lad, Columbus, IN (US); Joshua A. Lantz, North Vernon, IN (US); Boopathi Singalandapuram Mahadevan, Columbus, IN (US); Ian W. McGiffen, Scipio, IN (US); and Douglas A. Roxbury, Columbus, IN (US)
Assigned to Cummins Inc., Columbus, IN (US)
Filed by Cummins Inc., Columbus, IN (US)
Filed on Sep. 2, 2022, as Appl. No. 17/902,241.
Application 17/902,241 is a continuation of application No. 16/608,295, granted, now 11,434,797, previously published as PCT/US2018/029283, filed on Apr. 25, 2018.
Claims priority of provisional application 62/491,974, filed on Apr. 28, 2017.
Prior Publication US 2022/0412238 A1, Dec. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F01N 3/00 (2006.01); F01N 3/025 (2006.01); F01N 3/24 (2006.01); F01N 9/00 (2006.01); F02D 41/04 (2006.01); F02D 41/16 (2006.01); F01N 13/00 (2010.01)
CPC F01N 3/025 (2013.01) [F01N 3/24 (2013.01); F01N 9/002 (2013.01); F01N 13/009 (2014.06); F02D 41/04 (2013.01); F02D 41/16 (2013.01); F01N 2900/1606 (2013.01); F02D 2200/0812 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, by a controller, data regarding an exhaust gas flow rate of exhaust gas at a particular location and an amount of soot in the exhaust gas at the particular location in an exhaust aftertreatment system, wherein the particular location in the exhaust aftertreatment system is a selective catalytic reduction (SCR) inlet;
determining, by the controller, an adsorption amount of soot in the exhaust aftertreatment system based on the exhaust gas flow rate of the exhaust gas at the particular location and the amount of soot in the exhaust gas at the particular location;
comparing, by the controller, the adsorption amount of soot to a predefined adsorption amount limit;
in response to the adsorption amount of soot exceeding the predefined adsorption amount limit, initiating, by the controller, an exhaust cleaning event to remove at least some accumulated soot in the exhaust aftertreatment system;
receiving, by the controller, exhaust gas data during the exhaust cleaning event;
determining, by the controller, a desorption amount of soot based on the exhaust gas data, wherein a buffer is applied to determine the desorption amount, and wherein the buffer is a predefined period of time the exhaust data is collected before the desorption amount of soot is determined;
comparing, by the controller, the desorption amount of soot to a predefined desorption limit; and
ceasing, by the controller, the exhaust cleaning event based on the comparison.