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Increasing Exhaust Temperature of an Idling Light-Duty Diesel Engine through Post-Injection and Intake Throttling
Technical Paper
2018-01-0223
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Especially in crowded urban areas, light-duty vehicles often spend a great deal of time operating under idle conditions for which exhaust temperatures may be too low to maintain exhaust catalyst activity. This study investigated two methods of increasing Diesel exhaust temperature of a light-duty Diesel engine under idle conditions: post injection of fuel after TDC and intake throttling. For this particular study, EGR was not used. The engine operating parameters considered included three idle speeds of 800, 1100 and 1200 rpm, with the engine fully warmed up. Two rail pressures of 500 and 800 bar were studied with the injection strategy being the primary variable. The parameters measured included exhaust temperature, exhaust concentrations of NOx and HCs, as well as fuel consumption, IMEP and COV of IMEP. For the baseline idle conditions, manifold-out exhaust temperature was approximately 100 °C-105 °C. It was found that under idle conditions the post-injected fuel had to be injected within 30-45 degrees after TDC for the fuel to contribute to both IMEP and to higher exhaust temperatures. Without throttling, the contribution of the post-injection to increased exhaust temperature was relatively modest, about 20 °C. With heavy throttling it was possible to significantly increase idle exhaust temperature by more than 60 °C. The addition of post-injection in combination with heavy throttling allowed further temperature increases, on the order of 20-30 °C, yielding manifold-out exhaust temperatures above 200 °C. HC emissions, however, roughly doubling over the baseline idle condition. For conditions for which heavy throttling was used, it was interesting to note that the highest exhaust temperatures were found for a post-injection timing of approximately 25o –30oCA aTDC which also corresponded to a minimum in engine-out NOx emissions.
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Ozel, T., Hall, M., and Matthews, R., "Increasing Exhaust Temperature of an Idling Light-Duty Diesel Engine through Post-Injection and Intake Throttling," SAE Technical Paper 2018-01-0223, 2018, https://doi.org/10.4271/2018-01-0223.Data Sets - Support Documents
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References
- Gates , G. et al. https://www.nytimes.com/interactive/2015/business/international/vw-diesel-emissions-scandal-explained.html 2017
- Heywood , J.B. Internal Combustion Engine Fundamentals McGraw-Hill Inc. 1988
- Lustbader , J. , Kekelia , B. , Tomerlin , J. , Kreutzer , C. et al. Long-Haul Truck Sleeper Heating Load Reduction Package for Rest Period Idling SAE Int. J. Passeng. Cars – Mech. Syst. 9 2 2016 10.4271/2016-01-0258
- McGhee , M. , Shayler , P. , LaRocca , A. , Murphy , M. et al. The Influence of Injection Strategy and Glow Plug Temperature on Cycle by Cycle Stability under Cold Idling Conditions for a Low Compression Ratio, HPCR Diesel Engine SAE Int. J. Engines 5 3 923 937 2012 10.4271/2012-01-1071
- MacMillan , D. , La Rocca , A. , Shayler , J. , Morris , T. et al. Investigating the Effects of Multiple Pilot Injections on Stability at Cold Idle for a Dl Diesel Engine SAE Int. J. Engines 2 1 370 380 2009 10.4271/2009-01-0612
- La Rocca , A. , MacMillan , D. , Shayler , P. , Murphy , M. et al. CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine SAE Technical Paper 2014-01-2708 2014 10.4271/2014-01-2708
- Bobba , M. , Musculus , M. , and Neel , W. Effect of Post Injections on In-Cylinder and Exhaust Soot for Low-Temperature Combustion in a Heavy-Duty Diesel Engine SAE Int. J. Engines 3 1 496 516 2010 10.4271/2010-01-0612
- Wang , X. , Ge , Y. , and Yu , L. Combustion and Emission Characteristics of a Heavy-Duty Diesel Engine at Idle at Various Altitudes SAE Int. J. Engines 6 2 1145 1151 2013 10.4271/2013-01-1516
- Honardar , S. , Schnorbus , T. , Severin , C. , Kolbeck , A.F. et al. Exhaust Temperature Management for Diesel Engines Assessment of Engine Concepts and Calibration Strategies with Regard to Fuel Penalty SAE Technical Paper 2011-24-0176 2011 10.4271/2011-24-0176
- Ghandi , J. 2017