To meet stringent Euro-6 emission regulations, a lean NOx trap (LNT) catalyst should be considered to effectively abate NOx emissions. This LNT catalyst should be periodically regenerated without deteriorating driving quality and also satisfy emission constraints, such as CO, low particulate matter or smoke, and low O2 during the regeneration phase. As a means of reductant delivery, in-cylinder post fuel injection with a feedforward (FF) control has been applied due to its simple implementation in an engine management system (EMS). However, with this method, it is difficult to satisfy the driving quality and emission constraints during the transition to or out of the regeneration phase. To solve this problem, we propose a novel LNT regeneration control method using an indicated mean effective pressure (IMEP) and a combustion lambda feedback (FB) control combined with the FF control. For the precise FB control of the post injection timing, among the location of the second rate of heat release (ROHR) peak, the magnitude of the second ROHR peak, and IMEP, the IMEP was selected as a control parameter because of its lowest cyclic variation. In addition, the exhaust lambda control was applied for the accurate FB control of the post injection quantity. The proposed method was implemented in an in-house EMS. The performance in several engine tests indicated that the torque fluctuation was minimized and all emission constraints were effectively satisfied. Furthermore, this method was also robust with regard to the thermal disturbance.

References

References
1.
Oh
,
B.
,
Lee
,
M.
,
Park
,
Y.
,
Sohn
,
J.
,
Won
,
J.
, and
Sunwoo
,
M.
,
2013
, “
VGT and EGR Control of Common-Rail Diesel Engines Using an Artificial Neural Network
,”
ASME J. Eng. Gas Turbines Power
,
135
(
1
), p.
012801
10.1115/1.4007541.
2.
Han
,
M.
,
Jacobs
,
T. J.
,
Bohac
,
S. V.
, and
Assanis
,
D. N.
,
2008
, “
Method and Detailed Analysis of Individual Hydrocarbon Species From Diesel Combustion Modes and Diesel Oxidation Catalyst
,”
ASME J. Eng. Gas Turbines Power
,
130
(
4
), p.
042803
.10.1115/1.2900728
3.
Grondin
,
O.
,
Chauvin
,
J.
, and
Fontvieille
,
L.
,
2012
, “
Intake System Diagnosis for Diesel Engine With Dual-Loop EGR
,”
SAE
Technical Paper No. 2012-01-090410.4271/2012-01-0904.
4.
Johnson
,
T. V.
,
2012
, “
Vehicular Emissions in Review
,”
SAE Int. J. Engines
,
5
(
2
), pp.
216
234
10.4271/2012-01-0368.
5.
Hsieh
,
M.-F.
, and
Jumin
,
W.
,
2011
, “
NO and NO2 Concentration Modeling and Observer-Based Estimation Across a Diesel Engine Aftertreatment System
,”
ASME J. Dyn. Syst., Meas., Control
,
133
(
4
), p.
041005
10.1115/1.4003380.
6.
Lee
,
H.
,
Lee
,
J.
, and
Sunwoo
,
M.
,
2014
, “
Fault Diagnosis of Exhaust Gas Recirculation and Variable Geometry Turbocharger Systems in a Passenger Car Diesel Engine Based on a Sliding Mode Observer for Air System States Estimation
,”
ASME J. Dyn. Syst., Meas., Control
,
136
(
3
), p.
031016
10.1115/1.4026131.
7.
Canova
,
M.
,
Midlam-Mohler
,
S.
,
Pisu
,
P.
, and
Soliman
,
A.
,
2010
, “
Model-Based Fault Detection and Isolation for a Diesel Lean NOx Trap Aftertreatment System
,”
Control Eng. Pract.
,
18
(
11
), pp.
1307
1317
.10.1016/j.conengprac.2009.10.004
8.
Parks
,
J.
,
Huff
,
S.
,
Pihl
,
J.
,
Choi
,
J.-S.
, and
West
,
B.
,
2005
, “
Nitrogen Selectivity in Lean NOx Trap Catalysis With Diesel Engine In-Cylinder Regeneration
,”
SAE
Technical Paper No. 2005-01-387610.4271/2005-01-3876.
9.
Larson
,
R. S.
,
Pihl
,
J. A.
,
Kalyana Chakravarthy
,
V.
,
Toops
,
T. J.
, and
Daw
,
C. S.
,
2008
, “
Microkinetic Modeling of Lean NOx Trap Chemistry Under Reducing Conditions
,”
Catal. Today
,
136
(
1–2
), pp.
104
120
.10.1016/j.cattod.2007.12.117
10.
Johnson
,
T. V.
,
2009
, “
Diesel Emission Control in Review
,”
SAE Int. J. Fuels Lubr.
,
2
(
1
), pp.
1
12
10.4271/2009-01-0121.
11.
Midlam-Mohler
,
S.
, and
Guezennec
,
Y.
,
2006
, “
Regeneration Control for a Bypass-Regeneration Lean NOx Trap System
,”
American Control Conference
, Minneapolis, MN, June 14–16, pp.
1203
1208
10.1109/ACC.2006.1656381.
12.
Hsieh
,
M. F.
, and
Wang
,
J.
,
2009
, “
Nonlinear Model Predictive Control of Lean NOX Trap Regenerations
,”
48th IEEE Conference on Decision and Control
, 28th Chinese Control Conference (
CDC/CCC 2009
), Shanghai, China, Dec. 15–18, pp.
5182
5187
10.1109/CDC.2009.5399692.
13.
Hsieh
,
M.-F.
,
Wang
,
J.
, and
Canova
,
M.
,
2010
, “
Two-Level Nonlinear Model Predictive Control for Lean NOx Trap Regenerations
,”
ASME J. Dyn. Syst., Meas., Control
,
132
(
4
), p.
041001
10.1115/1.4001710.
14.
Jacobs
,
T. J.
,
2005
, “
Simultaneous Reduction of Nitric Oxide and Particulate Matter Emissions From a Light-Duty Diesel Engine Using Combustion Development and Diesel Oxidation Catalyst
,” Ph.D. thesis, University of Michigan, Ann Arbor, MI.
15.
Northrop
,
W. F.
,
Vanderpool
,
L. M.
,
Madathil
,
P. V.
,
Assanis
,
D. N.
, and
Bohac
,
S. V.
,
2010
, “
Investigation of Hydrogen Emissions in Partially Premixed Diesel Combustion
,”
ASME J. Eng. Gas Turbines Power
,
132
(
11
), p.
112803
.10.1115/1.4001069
16.
West
,
B.
,
Huff
,
S.
,
Parks
,
J.
,
Lewis
,
S.
,
Choi
,
J.-S.
,
Partridge
,
W.
, and
Storey
,
J.
,
2004
, “
Assessing Reductant Chemistry During In-Cylinder Regeneration of Diesel Lean NOx Traps
,”
SAE
Technical Paper No. 2004-01-302310.4271/2004-01-3023.
17.
Senatore
,
A.
,
Cardone
,
M.
,
Buono
,
D.
, and
Sessa
,
G.
,
2007
, “
Experimental Study of Lean NOx Trap Management
,”
SAE
Technical Paper No. 2007-01-344210.4271/2007-01-3442.
18.
Mctaggart-Cowan
,
G.
,
Wahab
,
E.
,
Peckham
,
M.
,
Cong
,
S.
, and
Garner
,
C.
,
2012
, “
Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters
,”
ASME J. Eng. Gas Turbines Power
,
134
(
8
), p.
082805
.10.1115/1.4006377
19.
Lim
,
J.
,
Oh
,
S.
,
Chung
,
J.
, and
Sunwoo
,
M.
,
2012
, “
Real-Time Combustion Phase Detection Using Central Normalized Difference Pressure in CRDI Diesel Engines
,”
ASME J. Eng. Gas Turbines Power
,
134
(
8
), p.
082801
.10.1115/1.4006582
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