| CPC F02D 41/0235 (2013.01) [F01N 3/021 (2013.01); F01N 3/101 (2013.01); F01N 3/103 (2013.01); F01N 3/2066 (2013.01); F01N 3/208 (2013.01); F01N 9/00 (2013.01); F01N 11/00 (2013.01); F02D 41/0002 (2013.01); F02D 41/0245 (2013.01); F02D 41/0275 (2013.01); F02D 41/3005 (2013.01); F01N 2430/00 (2013.01); F01N 2550/02 (2013.01); F01N 2570/14 (2013.01); F01N 2610/02 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1411 (2013.01); F01N 2900/1616 (2013.01); F01N 2900/1621 (2013.01); F02D 41/1445 (2013.01); F02D 41/1446 (2013.01); F02D 41/146 (2013.01); F02D 2041/1468 (2013.01); Y02T 10/12 (2013.01); Y02T 10/40 (2013.01)] | 8 Claims |
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1. A system comprising:
an engine out sensor positioned between an engine system and an aftertreatment system within a flow of exhaust gas, the sensor structured to provide an engine out information;
an exhaust sensor structured to provide an exhaust information indicative of an aftertreatment system characteristic; and
one or more processing circuits comprising one or more memory devices coupled to one or more processors, the one or more memory devices configured to store instructions thereon that, when executed by the one or more processors, cause the one or more processors to:
receive the engine out sensor information from the engine out sensor;
receive the exhaust information from the exhaust sensor;
determine a NOx reduction (deNOx) efficiency based on the exhaust information;
determine a predicted ammonia slip level based on the exhaust information, the predicted ammonia slip level indicative of a quantity of ammonia leaving the aftertreatment system;
compare the deNOx efficiency to a deNOx threshold;
in response to the comparison indicating that the deNOx efficiency is less than the deNOx threshold:
receive a first deNOx acceptable input value indicative of at least one of an engine out temperature or an engine out NOx value; and
at least one of increase the engine out temperature or reduce the engine out NOx value to adjust the deNOx efficiency towards the deNOx threshold;
compare the predicted ammonia slip level to an ammonia slip threshold, the ammonia slip threshold indicative of a predefined acceptable value of ammonia leaving the aftertreatment system;
in response to the comparison indicating that the predicted ammonia slip level is greater than the ammonia slip threshold, reduce the engine out temperature;
in response to the comparison indicating that the predicted ammonia slip level is less than the ammonia slip threshold, compare the deNOx efficiency to the deNOx threshold; and
in response to the comparison indicating that the deNOx efficiency is greater than the deNOx threshold and the comparison indicating that the predicted ammonia slip level is less than the ammonia slip threshold:
receive a second deNOx acceptable input value differing from the first deNOx acceptable input value, the second deNOx acceptable input value indicative of at least one of the engine out temperature or the engine out NOx value;
reduce the engine out temperature to operate at the second deNOx acceptable input value such that the deNOx efficiency adjusts towards the deNOx threshold; and
wherein the first deNOx acceptable input value and the second deNOx acceptable input value are each at least one of a desired exhaust gas temperature or a desired NOx quantity of exhaust gas leaving the engine.
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