Start of injection strategies for HCCI-combustion

Henrik Nordgren*, Anders Hultqvist, Bengt Johansson

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

17 Scopus citations

Abstract

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.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 2004
EventPowertrain and Fluid Systems Conference and Exhibition - Tampa, FL, United States
Duration: Oct 25 2004Oct 28 2004

Other

OtherPowertrain and Fluid Systems Conference and Exhibition
CountryUnited States
CityTampa, FL
Period10/25/0410/28/04

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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