US 12,146,432 B2
Systems and methods for sensor tampering detection
Vikram Sundararajan, Columbus, IN (US); Jinqian Gong, Columbus, IN (US); Kerang Wang, Columbus, IN (US); Randal D. Watts, Hartsville, IN (US); and Daniel D. Wilhelm, Sanibel, FL (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
Filed on Dec. 22, 2022, as Appl. No. 18/145,649.
Prior Publication US 2024/0209762 A1, Jun. 27, 2024
Int. Cl. F01N 3/20 (2006.01); F01N 11/00 (2006.01)
CPC F01N 3/208 (2013.01) [F01N 11/00 (2013.01); F01N 2550/02 (2013.01); F01N 2560/026 (2013.01); F01N 2560/14 (2013.01); F01N 2900/0416 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An aftertreatment system comprising:
a first leg comprising a first Selective Catalytic Reduction (SCR) system and a first doser;
a second leg comprising a second SCR system and a second doser; and
a controller configured to:
determine satisfaction of one or more enabling conditions;
in response to the satisfaction of the one or more enabling conditions, dose reductant to the first SCR system using the first doser and to the second SCR system using the second doser;
determine, in response to the dosing, a first NOx value of the first SCR system based on a reading from a first NOx sensor associated with the first leg, and a second NOx value of the second SCR system based on a reading from a second NOx sensor associated with the second leg;
adjust the dosing of the first SCR system for a first time period in response to the first NOx value and the second NOx value reaching a first predetermined threshold;
at the end of a second time period after adjusting the dosing of the first SCR system, measure a third NOx value of the first SCR system based on the reading from the first NOx sensor, and measure a fourth NOx value of the second SCR system based on the reading from the second NOx sensor;
determine a first difference between the third NOx value and the first NOx value;
determine a second difference between the fourth NOx value and the second NOx value; and
generate an indication regarding whether the second NOx sensor is displaced based on the first difference and the second difference.