Exhaust purification device and method of calculating NOx mass adsorbed in lean NOx trap of exhaust purification device
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United States of America Patent
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Oct 31, 2017
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Oct 6, 2016
app pub date -
Dec 1, 2015
filing date -
Mar 30, 2015
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Abstract
A method of calculating a nitrogen oxide (NOx) mass adsorbed in a lean NOx trap (LNT) of an exhaust purification device includes calculating a NOx mass flow stored in the LNT, calculating a NOx mass flow thermally released from the LNT, calculating a NOx mass flow released from the LNT at the rich air/fuel ratio, calculating a NOx mass flow chemically reacting with the reductant at the LNT, and integrating a value obtained by subtracting the NOx mass flow thermally released from the LNT, the NOx mass flow released from the LNT at the rich air/fuel ratio, and the NOx mass flow chemically reacting with the reductant at the LNT from the NOx mass flow stored in the LNT.
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