Exhaust aftertreatment system diagnostic and conditioning
AssigneeCummins IP, Inc.
InventorsTony J. Hall, Stephen J. Charlton, Michael J. McGuire
Life of this patent
Estimating the term…
Abstract
An engine diagnostic tool includes a diagnostic engine calibration module structured to include a plurality of diagnostic processes for operating an internal combustion engine system of an immobilized vehicle. One or more of the plurality of diagnostic processes are structured to be an intrusive diagnostic process for the internal combustion engine system, wherein the intrusive diagnostic process causes the internal combustion engine system to operate outside of one or more calibration parameters. The diagnostic engine module is further structured to control the order and timing of each diagnostic process in the plurality of diagnostic processes.
Claims19
An apparatus, comprising:
- a diagnostic engine calibration module structured to diagnose a vehicle system without user intervention, wherein the diagnostic engine calibration module includes:
- a high NOx module structured to disable a diesel exhaust fluid (DEF) dosing event, operate an internal combustion engine system to provide an amount of engine out NOx at or above a predefined high NOx concentration threshold, operate an engine of the vehicle system at or above a high speed threshold, determine a NOx concentration across a selective catalytic reduction (SCR) system of the vehicle system, and compare the determined NOx concentration against a predetermined fault threshold to diagnose a NOx sensor in the vehicle system;
- wherein the diagnostic engine calibration module is configured to cause the vehicle system to operate outside of one or more calibration parameters.
An internal combustion engine system, comprising:
- a controller comprising memory designated for storage of an engine calibration program and a diagnostic engine calibration program, the engine calibration program structured to operate the internal combustion engine system while the internal combustion engine system is mobilized;
- wherein the diagnostic engine calibration program is structured to diagnose the internal combustion engine system without user intervention while the internal combustion engine system is immobilized;
- wherein the diagnostic engine calibration program includes a high NOx module structured to disable a diesel exhaust fluid (DEF) dosing event, operate the internal combustion engine system to provide an amount of engine out NOx at or above a predefined high NOx concentration threshold, operate an engine of the internal combustion engine system at or above a high speed threshold, determine a NOx concentration across a selective catalytic reduction (SCR) system, and compare the determined NOx concentration against a predetermined fault threshold to diagnose a NOx sensor in the internal combustion engine system:
- and
- wherein the diagnostic engine calibration program is configured as intrusive diagnostic processes that cause the internal combustion engine system to operate outside of one or more calibration parameters.
Dependencies are inferred from the claim text.