System and method of purifying exhaust gas
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United States of America Patent
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Jun 5, 2018
Issued Date -
Jan 25, 2018
app pub date -
Nov 2, 2016
filing date -
Jul 25, 2016
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Abstract
A method of purifying exhaust gas may include predicting a slip probability of ammonia (NH3) to a rear end of a selective catalytic reduction on diesel particulate filter (SDPF), comparing the predicted ammonia slip probability with a slip probability of ammonia limiting operation of a low pressure-exhaust gas recirculation (LP-EGR) system, comparing an absorption amount of ammonia with a value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio when the predicted ammonia slip probability is larger than the slip probability of ammonia limiting operation of the LP-EGR system, limiting the operation of the LP-EGR when the absorption amount of ammonia is not larger than the value obtained by multiplying an ammonia absorption target amount by a minimum target absorption amount ratio, and dosing a urea solution.
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