Exhaust Hydrocarbon Speciation from a Single-Cylinder Compression Ignition Engine Operating with In-Cylinder Blending of Gasoline and Diesel Fuels Navistar Incorporated

Format:

Conference/Event

Author/Creator:

De Ojeda, De Ojeda, author.

Contributor:

Han, Xiaoye

Wang, Meiping

Xie, Kelvin

Zhang, Yu

Zheng, Ming

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Diesel aided by gasoline low temperature combustion offers lowNOx and low soot emissions, and further provides the potential toexpand engine load range and improve engine efficiency. Thediesel-gasoline operation however yields high unburned hydrocarbons(UHC) and carbon monoxide (CO) emissions. This study aims tocorrelate the chemical origins of the key hydrocarbon speciesdetected in the engine exhaust under diesel-gasoline operation. Itfurther aims to help develop strategies to lower the hydrocarbonemissions while retaining the low NOx, low soot, and efficiencybenefits.A single-cylinder research engine was used to conduct the engineexperiments at a constant engine load of 10 bar nIMEP with a fixedengine speed of 1600 rpm. Engine exhaust was sampled with a FTIRanalyzer for speciation investigation. The results indicated thatunder diesel-only operation, with the increase of EGR rate, C₁~C₃hydrocarbons gradually became the dominant hydrocarbon species inthe engine exhaust. Under diesel-gasoline operation, UHC wereprimarily present as mono-aromatics and C₄~C₇ alkanes, which arelikely either unoxidized or lightly oxidized gasoline constituents.In addition, experiments were conducted to explore suitablestrategies to reduce the UHC emissions from diesel-gasolineoperation. The increase of diesel fraction reduced UHC emissionsbut increased soot emissions, as the overall fuel reactivity wasenhanced but the cylinder charge heterogeneity deteriorated. Theresults also showed that advancing the diesel SOI led tosignificant drop in UHC emissions without compromising the low NOxand low soot emissions. With the improved control strategies indiesel-gasoline operation, UHC emissions were reduced by 65% whilethe engine NOx and soot emissions remained low and the engine cycleefficiency was improved by 8%

Notes:

Vendor supplied data

Publisher Number:

2012-01-0683

Access Restriction:

Restricted for use by site license