An Experimental Investigation of Diesel-Gasoline Blends Effects in a Direct-Injection Compression-Ignition Engine Operating in PCCI Conditions Universitat Politecnica de Valencia

Format:

Conference/Event

Author/Creator:

Benajes, Benajes, author.

Contributor:

Broatch, Alberto

Garcia, Antonio

Monico Muñoz, Luisa

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

Compared to the gasoline engine, the diesel engine has theadvantage of being more efficient and hence achieving a reductionof CO₂ levels. Unfortunately, particulate matter (PM) and nitrogenoxides (NOx) emissions from diesel engines are high. Toovercome these drawbacks, several new combustion concepts have beendeveloped, including the PCCI (Premixed Charge CompressionIgnition) combustion mode. This strategy allows a simultaneousreduction of NOx and soot emissions through thereduction of local combustion temperatures and the enhancement ofthe fuel/air mixing. In spite of PCCI benefits, the concept ischaracterized by its high combustion noise levels. Currently, apromising way to improve the PCCI disadvantages is beinginvestigated. It is related with the use of low cetane fuels suchas gasoline and diesel-gasoline blends.In this paper an experimental study is carried out focusing onevaluating emissions, performances and combustion noise in PCCIconditions when using diesel-gasoline blends. For this purpose, aparametrical study has been performed varying injection timing andfuel type in a High Speed Direct Injection (HSDI) dieselengine.Results show how increasing the gasoline percentage in the fuelblend results in an enlarged ignition delay, therefore achieving anextended mixing time between the End of Injection (EoI) and theStart of Combustion (SoC). As a consequence, lower localequivalence ratios are achieved and therefore lower soot emissionsare reached. Additionally, performances and the sound quality ofcombustion noise are improved. By contrast, NOx levelsare slightly increased

Notes:

Vendor supplied data

Publisher Number:

2013-01-1676

Access Restriction:

Restricted for use by site license