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Start of injection strategies for HCCI-combustion
Lunds Tekniska Högskola, Värme- och kraftteknik.
2004 (English)In: SAE, Homogeneous Charge Compression Ignition (Part C&D), 2004Conference paper (Refereed)
Abstract [en]

Homogeneous Charge Compression Ignition (HCCI) has a great potential for low NOx emissions but problems with emissions of unburned hydrocarbons (HC). One way of reducing the HC is to use direct injection. The purpose of this paper is to present experimental data on the trade off between NOx and HC. Injection timing, injection pressure and nozzle configuration all effect homogeneity of the mixture and thus the NOx and HC emissions. The engine studied is a single cylinder version of a Scania D12 that represents a modern heavy-duty truck size engine. A common rail (CR) system has been used to control injection pressure and timing. The combustion using injectors with different nozzle hole diameters and spray angle, both colliding and non-colliding, has been studied. The NOx emission level changes with start of injection (SOI) and the levels are low for early injection timing, increasing with retarded SOI. Different injectors produce different NOx levels. Especially at late injection timing, at about -50°ATDC, there is a significant difference between injectors. The HC emissions also differ for different injection timing and injectors.

Place, publisher, year, edition, pages
, SAE Technical Papers, 2004-01-2990
Keyword [en]
Common rail, Experimental data, HC emissions, Heavy duty trucks, Homogeneous charge compression ignition, Injection pressures, Injection timing, Low NOx emissions, NOx emissions, Nozzle configuration, Nozzle holes, Spray angle, Start of injections, Trade off, Unburned hydrocarbons
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177563DOI: 10.4271/2004-01-2990ScopusID: 2-s2.0-84877237738OAI: diva2:873257
Powertrain & Fluid Systems Conference & Exhibition, Tampa, FL, USA.

QC 20151127

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-27Bibliographically approved

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Hultqvist, Anders
Mechanical Engineering

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