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Analysis of Regulated Pollutant Emissions and Aftertreatment Efficiency in a GTDi Engine Using Different SOI Strategies
Journal Article
03-11-03-0025
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Bermúdez, V., Luján, J., Climent, H., Soto, L. et al., "Analysis of Regulated Pollutant Emissions and Aftertreatment Efficiency in a GTDi Engine Using Different SOI Strategies," SAE Int. J. Engines 11(3):363-382, 2018, https://doi.org/10.4271/03-11-03-0025.
Language:
English
Abstract:
In order to improve performance and minimize pollutant emissions in gasoline
turbocharged direct-injection (GTDi) engines, different injection strategies and
technologies are being investigated. The inclusion of exhaust gas recirculation
(EGR) and the variation of the start of injection (SOI) are some of these
strategies that can influence the air-to-fuel (AF) mixture formation and
consequently in the combustion process and pollutant emissions. This article
presents a complete study of the engine performance, pollutant emissions and
aftertreatment efficiency that produces the SOI variation with a fixed EGR rate
in a 4-cylinder, turbocharged, gasoline direct-injection engine with 2.0 L
displacement. The equipment used in this study are TSI-EEPS for particle
measurement and HORIBA MEXA 1230-PM for soot measurement being HORIBA MEXA
7100-DEGR with a heated line selector the system employed for regulated gaseous
emission measurement and aftertreatment evaluation. The experimental results
confirm how the use of an adequate SOI strategy is indispensable to obtain low
exhaust emissions values and a balance between the different pollutants. There
was found a slight reduction in brake specific fuel consumption (BSFC) with the
SOI advance. The experiments showed a decrease in CO, a non-sensible variation
of THC and an increase in NOx emissions with SOI delay. Additionally, a
significant increase in particle emissions was observed with early SOIs.
Finally, with the SOI delay the aftertreatment performance revealed an increase
in the oxidation of CO and a decrease in the reduction of NOx.