Engine health and oil consumption rate diagnostic using back pressure

A method comprising:

• determining, by a controller of an aftertreatment system, an actual pressure drop across a particulate filter configured to receive exhaust gas from an engine based on pressure measurements across the particulate filter;
• determining, by the controller, 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;
• determining, by the controller, an expected pressure drop across the particulate filter based on the total ash accumulation rate;
• comparing, by the controller, the expected pressure drop with the actual pressure drop;
• determining, by the controller, whether an oil consumption rate in the engine is abnormal based on the comparison;
• and
• responsive to determining the oil consumption rate of the engine is abnormal, raising, by the controller, an alert to indicate abnormal oil consumption rate.

A non-transitory computer-readable media comprising computer-readable instructions stored thereon that when executed by a controller of an aftertreatment system causes the controller to perform a process comprising:

• determining an actual pressure drop across a particulate filter configured to receive exhaust gas from an engine based on pressure measurements across the particulate filter;
• determining 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;
• determining an expected pressure drop across the particulate filter based on the expected total ash accumulation rate;
• comparing the expected pressure drop with the actual pressure drop;
• determining whether an oil consumption rate in 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.