The effect of compression ratio on exhaust emissions from a PCCI diesel engine

Laguitton, O., Crua, Cyril, Cowell, T., Heikal, Morgan and Gold, M.R. (2007) The effect of compression ratio on exhaust emissions from a PCCI diesel engine Energy Conversion & Management, 48 (11). pp. 2918-2924. ISSN 0196-8904

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A description of the development of a single cylinder test facility is presented, being based on a production 4-cylinder DI Diesel engine and designed to allow study of the emissions characteristics over a very wide range of operating conditions. The objective was to establish how engine out NOx emissions can be reduced to the estimated levels required by the next emissions target ‘Euro 6’ and thus be able to apply the findings to the original 4-cylinder engine and minimise the requirement for currently immature NOx after treatment. It has been proposed that further reduction in compression ratio beyond current levels would be beneficial to engine out emissions and specific power, and could be facilitated by developments in cold start technology. The results of a study using this single cylinder facility to evaluate the effect of reducing compression ratio from 18.4 to 16.0 are presented. It was found that, although there was a small CO and HC penalty, either reducing the compression ratio or retarding the injection timing greatly reduced NOx and soot emissions when both premixed and diffusion-combustion phases were present. This effect was less significant when the combustion was solely premixed.

Item Type: Journal article
Additional Information: This is the author’s version of a work that was accepted for publication in Energy Conversion & Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy Conversion & Management, 48, 11, 2007 DOI: 10.1016/j.enconman.2007.07.016
Uncontrolled Keywords: Diesel emissions; Diesel combustion strategies; Compression ratio
Subjects: H000 Engineering > H300 Mechanical Engineering > H330 Automotive Engineering
DOI (a stable link to the resource): 10.1016/j.enconman.2007.07.016
Faculties: Faculty of Science and Engineering > School of Computing, Engineering and Mathematics > Engineering and Product Design Research > Automotive Engineering
Depositing User: Dr Cyril Crua
Date Deposited: 19 Nov 2007
Last Modified: 16 Mar 2015 15:36

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