Browse Publications Technical Papers 02-14-03-0030
2021-09-02

Methodology for Controlling Nitrogen Oxides Emissions during Cold Start 02-14-03-0030

This also appears in SAE International Journal of Commercial Vehicles-V130-2EJ

The current publication considers several methodologies to minimize tailpipe (TP) nitrogen oxides (NOx) emissions during cold start operation. A standard, 2019 aftertreatment design of diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR)/ammonia oxidation catalyst (AMOX) was used as the baseline. Cold start NOx conversion and TP NOx emissions improvements were measured when a larger SCR, dual diesel exhaust fluid (DEF) dosing, and an electric heater were added to the exhaust configuration. Additional improvements were achieved by an improved cold start combustion mode was developed.

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