TY - JOUR
T1 - Investigation of the nitrogen oxide reduction characteristics and in-cylinder controls of the regeneration mode of a lean nitrogen oxide trap catalyst in a light-duty diesel engine
AU - Yoon, Joo Wung
AU - Park, Simsoo
N1 - Funding Information:
This study was supported by a Korea University grant.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/7
Y1 - 2013/7
N2 - This investigation focused on an in-cylinder control method to create a rich atmosphere inside a lean nitrogen oxide trap catalyst. The experimental procedures can be summarized as follows. To adjust to the excess air ratio λ values of 0.92 and 0.96, the air mass was fixed using a limited post-injection quantity from an engine management system, the main injection timing was slightly adjusted to create a rich atmosphere inside a lean nitrogen oxide trap catalyst in advance and the precise λ values were adjusted by regulating the post-injection timing together with the post-injection quantity calculated using the logic of the engine control unit. The results were as follows. First, the main-injection quantity was greatly reduced when a post-injection quantity was supplied. Second, it was verified that the post-injection quantity participated in generating the torque. Third, the overall efficiency was 26-63% and included a storage efficiency of 11-51%, a reduction efficiency of 56-89% and a conversion efficiency of 11-50%. Fourth, to control the lean nitrogen oxide trap catalyst temperature and its performance precisely using a small λ value, which was caused by the post-injection quantity, as the speed (r/min) increased, the air mass supply must be increased more during the rich mode than during the lean mode.
AB - This investigation focused on an in-cylinder control method to create a rich atmosphere inside a lean nitrogen oxide trap catalyst. The experimental procedures can be summarized as follows. To adjust to the excess air ratio λ values of 0.92 and 0.96, the air mass was fixed using a limited post-injection quantity from an engine management system, the main injection timing was slightly adjusted to create a rich atmosphere inside a lean nitrogen oxide trap catalyst in advance and the precise λ values were adjusted by regulating the post-injection timing together with the post-injection quantity calculated using the logic of the engine control unit. The results were as follows. First, the main-injection quantity was greatly reduced when a post-injection quantity was supplied. Second, it was verified that the post-injection quantity participated in generating the torque. Third, the overall efficiency was 26-63% and included a storage efficiency of 11-51%, a reduction efficiency of 56-89% and a conversion efficiency of 11-50%. Fourth, to control the lean nitrogen oxide trap catalyst temperature and its performance precisely using a small λ value, which was caused by the post-injection quantity, as the speed (r/min) increased, the air mass supply must be increased more during the rich mode than during the lean mode.
KW - Air mass
KW - Coefficient of variance
KW - Engine management system
KW - Excess air ratio λ
KW - Indicated mean effective pressure
KW - Lean nitrogen oxide trap catalyst
KW - Main-injection quantity
KW - Post-injection quantity
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U2 - 10.1177/0954407012475272
DO - 10.1177/0954407012475272
M3 - Article
AN - SCOPUS:84883410082
VL - 227
SP - 1053
EP - 1071
JO - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
JF - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
SN - 0954-4070
IS - 7
ER -