Direct injection (DI) diesel engines emit a far more disagreeable exhaust odor than gasoline engines, especially at low temperatures and at idling. There is no proper system of odor reduction in these conditions in DI diesel engines. This study investigated a charcoal-adsorption system to reduce exhaust emissions including odor in a DI diesel engine at idling under no load operations, where exhaust temperatures are low. Low temperature exhaust gas is passed through a charcoal adsorber. Charcoal has the property of adsorbing odorous gas components. Here odor is reduced more than 0.5 points, a significant odor reduction depending on the engine and adsorber conditions. Exhaust noise, nitrogen oxides (NOx), and eye irritation are also significantly reduced with the system. This study further investigated water-washing system for odor reduction in DI diesel engines at low exhaust temperature conditions. Exhaust gas is passed through the water in the water tank of the system. Aldehydes, organic acids, and other oxygenated components, which are the main odorous components in exhaust gases, are dissolved in water reducing exhaust odor significantly. Eye irritation of exhaust gases is also significantly reduced. The water-washing system not only reduces the odor and eye irritation but also carbon dioxide (CO2), carbon monoxide (CO), NOx, and smoke are reduced more than 20–30%. The sound level of exhaust gases is also reduced 1015dB with this system. Air dilution is also attempted in this study for odor reduction where a large amount of fresh air is mixed with exhaust gases. Here dilution ratio of 5 is used. Air dilution alone can reduce odor about 0.5 points. However, odor about 1.5–1.6 points (about 60–65%) can be reduced when air dilution is used in combination with charcoal-adsorber and water-washing system, and odor level is lowered below level 2, which is acceptable for all human beings.

1.
Tanaka
,
T.
,
Kobashi
,
K.
, and
Sami
,
H.
, 1992, “
Development of a Diesel Odor Measurement Method and Its Application to Odor Reduction
,” SAE Paper No. 920726.
2.
Roy
,
M. M.
,
Tsunemoto
,
H.
, and
Ishitani
,
H.
, 1999, “
Effect of Injection Timing and Fuel Properties on Exhaust Odor in DI Diesel Engines
,” SAE Paper No. 1999-01-1531.
3.
Mallamo
,
F.
,
Badami
,
M.
, and
Millo
,
F.
, 2005, “
Effect of Compression Ratio and Injection Pressure on Emissions and Fuel Consumption of a Small Displacement Common Rail Diesel Engine
,” SAE Paper No. 2005-01-0379.
4.
Uekusa
,
T.
, 2005, “
Emission Reduction Study for Meeting New Requirements with Advanced Diesel Engine Technology
,” SAE Paper No. 2005-01-2143.
5.
Roy
,
M. M.
, 2006, “
Effect of Engine Operation Parameters, Fuel Property and Exhaust Gas Treatment on Exhaust Odor in Direct Injection Diesel Engines
,”
Proc. Inst. Mech. Eng., Part D (J. Automob. Eng.)
0954-4070,
220
(
5
), pp.
595
609
.
6.
Mac Carthy
,
C. I.
,
Slodowske
,
W. J.
,
Sienicki
,
E. J.
, and
Jass
,
R. E.
, 1992, “
Diesel Fuel Property Effects on Exhaust Emissions From a Heavy Duty Diesel Engine That Meets 1994 Emissions Requirements
,” SAE Paper No. 922267.
7.
Arima
,
T.
,
Obata
,
K.
,
Cao
,
G. H.
,
Ogawa
,
H.
, and
Miyamoto
,
N.
, 1996, “
Improvements to Diesel Combustion and Emissions by Oxygenated Agent Addition to Diesel Fuels-Influence of Diesel Fuels and Oxygenated Agent Properties
,”
Proceedings of JSAE
, Paper 9637483, pp.
269
272
, in Japanese.
8.
Roy
,
M. M.
,
Tsunemoto
,
H.
, and
Ishitani
,
H.
, 2000, “
Effect of MTBE and DME on Odorous Emissions in a DI Diesel Engine
,”
JSME Int. J., Ser. B
1340-8054,
43
(
3
), pp.
511
517
.
9.
Hilden
,
D. L.
,
Crellin
,
C. C.
,
Toner
,
J.
, and
Wolf
,
L. R.
, 2005, “
The Exhaust Emissions of Prototype Ultra-Low Sulfur and Oxygenated Diesel Fuels
,” SAE Paper No. 2005-01-3880.
10.
Roy
,
M. M.
, 2005, “
Effect of n-heptane and n-decane on Exhaust Odour in Direct Injection Diesel Engines
,”
Proc. Inst. Mech. Eng., Part D (J. Automob. Eng.)
0954-4070,
219
(
4
), pp.
565
571
.
11.
Patterson
,
J.
,
Hassan
,
M. G.
,
Clarke
,
A.
,
Shama
,
G.
,
Hellgardt
,
K.
, and
Chen
,
R.
, 2006, “
Experimental Study of DI Diesel Engine Performance Using Three Different Biodiesel Fuels
,” SAE Paper No. 2006-01-0234.
12.
Babu
,
M. K. G.
,
Kumar
,
C.
, and
Das
,
L. M.
, 2006, “
Experimental Investigations on a Karanja Oil Methyl Ester Fueled DI Diesel Engine
,” SAE Paper No. 2006-01-0238.
13.
Zelenka
,
P.
,
Hoenberg
,
G.
, and
Graf
,
U.
, 1994, “
Diesel Oxidation Catalyst Application Strategies With Special Emphasis on Odor Reduction
,” SAE Paper No. 942066.
14.
Roy
,
M. M.
,
Tsunemoto
,
H.
,
Ishitani
,
H.
,
Akiyama
,
J.
, and
Minami
,
T.
, 2000, “
Effect of High Pressure Injection and Oxidation Catalyst on Exhaust Odor in DI Diesel Engines
,”
SAE Transactions, Journal of Fuels and Lubricants
,
4
, pp.
1623
1631
.
15.
Hassaneen
,
A. E.
, 2005, “
Conversion Efficiency of a 2-Way Catalyst Fitted in a Used Vehicles Without Feedback Emission Control System
,” SAE Paper No. 2005-01-2164.
16.
Knafl
,
A.
,
Busch
,
S. B.
,
Han
,
M.
,
Bohac
,
S. V.
,
Assanis
,
D. N.
,
Szymkowicz
,
P. G.
, and
Blint
,
R. D.
, 2006, “
Characterizing Light-Off Behavior and Species-Resolved Conversion Efficiencies During In-Situ Diesel Oxidation Catalyst Degreening
,” SAE Paper No. 2006-01-0209.
17.
Lua
,
A. C.
, and
Guo
,
J.
, 2000, “
Activated Carbon Prepared from Oil Palm Stone by One-Step CO2 Activation for Gaseous Pollutant Removal
,”
Carbon
0008-6223,
38
(
7
), pp.
1089
1097
.
18.
Servati
,
H. B.
,
Marshall
,
S. E.
,
Murphy
,
J.
,
Zhou
,
W.
, and
Lewis
,
W.
, 2005, “
Carbon Canister-Based Vapor Management System to Reduce Cold-Start-Hydrocarbon Emissions
,” SAE Paper No. 2005-01-3866.
19.
Shiozaki
,
T.
,
Otani
,
T.
,
Joko
,
I.
, and
Ohnishi
,
T.
, 1991, “
A Study of the White Smoke and the Odor of DI Diesel Engines in a Cold Weather Environment
,”
Proceedings of JSAE
, Paper No. 912247, pp.
3.57
3.60
, in Japanese.
20.
Roy
,
M. M.
,
Tsunemoto
,
H.
,
Ishitani
,
H.
,
Akiyama
,
J.
,
Minami
,
T.
, and
Noguchi
,
M.
, 2000, “
Influence of Aldehyde and Hydrocarbon Components in the Exhaust on Exhaust Odor in DI Diesel Engines
,”
SAE Transactions, Journal of Fuels and Lubricants
,
4
, pp.
2398
2405
.
21.
Owkita
,
T.
, and
Shigeta
,
Y.
, 1972,
Analysis Method of Low Concentration Gas and Bad Smell
,
KOUDANNSYA
, pp.
117
215
, in Japanese.
22.
Tsunemoto
,
H.
,
Ishitani
,
H.
, and
Kudo
,
R.
, 1996, “
Evaluation of Exhaust Odor in a Direct Injection Diesel Engine
,”
Trans. Jpn. Soc. Mech. Eng., Ser. B
0387-5016,
62
(
604
), pp.
254
260
, in Japanese.
23.
Roy
,
M. M.
, 2001, “
Exhaust Odor Reduction in DI Diesel Engines-Effects of Engine Parameter, Fuel Property and Oxidation Catalyst
,”
Kitami Institute of Technology
, Kitami.
24.
Roy
,
M. M.
,
Tushar
,
Md. S. H. K.
,
Hasan
,
Md. M. U.
, and
Shamsunnahar
, 2003, “
Exhaust Gas After Treatment by Absorption System to Reduce Odor at Idling
,”
ICME03-TH-06, Proceedings of the International Conference on Mechanical Engineering
,
Dhaka
, pp.
1
6
.
25.
Zikoridse
,
G.
,
et al.
, 2000, “
Particulate Trap Technology for Light Duty Vehicles With a New Regeneration Strategy
,” SAE Paper No. 2000-01-1924.
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