FIELD: internal combustion engines.
SUBSTANCE: methods and systems are proposed to reduce emissions from the engine at cold start. Exhaust system having a passive NOx adsorber (PNA) may store NOx during an engine cold-start until conditions are optimal for release of the stored NOx to a downstream SCR catalyst. Based on PNA conditions, including a NOx load and a PNA bed temperature, adjustments to EGR rate and/or injection timing may be made to achieve a catalytically favorable ratio of NOx species upstream of the SCR catalyst, after the SCR catalyst has reached its light-off temperature.
EFFECT: invention relates to the purification of internal combustion engine exhaust gases.
18 cl, 5 dwg
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