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The NOx and N2O Emission Characteristics of an HCCI Engine Operated With N-Heptane

[+] Author Affiliations
Hailin Li, W. Stuart Neill, Hongsheng Guo, Wally Chippior

National Research Council Canada, Ottawa, ON, Canada

Paper No. ICEF2007-1758, pp. 365-375; 11 pages
  • ASME 2007 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2007 Internal Combustion Engine Division Fall Technical Conference
  • Charleston, South Carolina, USA, October 14–17, 2007
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 0-7918-4811-6 | eISBN: 0-7918-3810-2
  • Copyright © 2007 by National Research Council of Canada


This paper presents the NOx and N2 O emission characteristics of a Cooperative Fuel Research (CFR) engine modified to operate in Homogeneous Charge Compression Ignition (HCCI) combustion mode using an air-assist port fuel injector. The single-cylinder engine was fuelled with n-heptane for these experiments. The parameters examined include intake air temperature and pressure, air/fuel ratio, compression ratio, and exhaust gas recirculation (EGR) rate. The parameters were varied in order to change the combustion phasing from advanced (knocking) to retarded (incomplete combustion) conditions. NOx emissions were less than 5 ppm for a fairly wide range of combustion phases, except when knocking or incomplete combustion occurred, and were largely unaffected by the parameter varied when the combustion phase was within the acceptable range. It was also found that NOx emissions increased significantly when retarded and incomplete combustion was observed even though lower combustion temperatures were expected. The increased N2 O and unburned hydrocarbon (THC) emissions usually observed with retarded combustion phasing, as well as the deteriorated combustion efficiency, may contribute to this unexpected increase in NOx emissions. It was also shown that N2 O emissions were extremely low (less than 0.5 ppm) except when incomplete combustion was observed.

Copyright © 2007 by National Research Council of Canada



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