US 12,460,568 B2
Engine health and oil consumption rate diagnostic using back pressure
James Zokoe, Jr., Columbus, IN (US); Shirish S. Punde, Columbus, IN (US); Bryon D. Staebler, Columbus, IN (US); and Rayomand Dabhoiwala, Columbus, IN (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Appl. No. 18/577,143
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
PCT Filed Jul. 8, 2021, PCT No. PCT/US2021/040918
§ 371(c)(1), (2) Date Jan. 5, 2024,
PCT Pub. No. WO2023/282902, PCT Pub. Date Jan. 12, 2023.
Prior Publication US 2025/0043710 A1, Feb. 6, 2025
Int. Cl. F01N 9/00 (2006.01); F01N 11/00 (2006.01)
CPC F01N 9/007 (2013.01) [F01N 11/002 (2013.01); F01N 2900/1606 (2013.01); F01N 2900/1611 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An aftertreatment system comprising:
a particulate filter configured to receive exhaust gas from an engine; and
a controller that executes computer-readable instructions stored on a memory to:
determine an actual pressure drop across the particulate filter based on pressure measurements across the particulate filter;
determine an expected total ash accumulation rate in the particulate filter based on a first calibration table comprising a plurality of pressure drops across a test particulate filter and a corresponding first ash accumulation rate or a soot and ash accumulation rate in the test particulate filter at each of the plurality of pressure drops and a second calibration table comprising a plurality of duty cycles and a corresponding estimated oil consumption rate at each of the plurality of duty cycles;
determine an expected pressure drop across the particulate filter based on the expected total ash accumulation rate;
compare the expected pressure drop with the actual pressure drop;
determine whether an oil consumption rate of the engine is abnormal based on the comparison; and
responsive to determining the oil consumption rate of the engine is abnormal, raising an alert to indicate abnormal oil consumption rate.