EP1682764-A2  See references of WO 2005028837A2;  D.T. HOUNTALAS, R.G. PAPAGIANNAKIS: "A simulation model for the combustion process of natural gas engines with pilot diesel fuel as an ignition source" SAE 2001 WORLD CONGRESS, DETROIT, MICHIGAN, USA, 5 March 2001 (2001-03-05), - 8 March 2001 (2001-03-08) XP002562896;  GUeHMANN C: "Modellbildung und Testautomatisierung fuer die Hardware-in-the-Loop Simulation" INTERNET CITATION, [Online] 1 January 2002 (2002-01-01), pages 1-16, XP002510899 Retrieved from the Internet: URL:http://www.mdt.tu-berlin.de/publikatio nen/Guehmann2002/at_download/fi le_pdf [retrieved on 2009-01-19];  MARKEL T ET AL: "ADVISOR: a systems analysis tool for advanced vehicle modeling" JOURNAL OF POWER SOURCES, ELSEVIER SA, CH, vol. 110, no. 2, 22 August 2002 (2002-08-22), pages 255-266, XP004393625 ISSN: 0378-7753;  See also references of WO 2005028837A2US7392129-B2  Miyake, M., et al., "The development of high output, highly efficient gas burning diesel engines", CIMAC (International Council on Combustion Engines), 1983.;  Tice, J.K., et al., "Field Test and Development of a Low-Cost Mechanically Actuated, Enhanced Mixing System for Emissions Reduction", Gas Machinery Conference Proceedings, Oct. 2003, Salt Lake City.WO2005028837-A3  See also references of EP 1682764A4EP1682764-B1  D.T. HOUNTALAS, R.G. PAPAGIANNAKIS: "A simulation model for the combustion process of natural gas engines with pilot diesel fuel as an ignition source" SAE 2001 WORLD CONGRESS, DETROIT, MICHIGAN, USA, 5 March 2001 (2001-03-05), - 8 March 2001 (2001-03-08) XP002562896;  GUeHMANN C: "Modellbildung und Testautomatisierung fuer die Hardware-in-the-Loop Simulation" INTERNET CITATION, [Online] 1 January 2002 (2002-01-01), pages 1-16, XP002510899 Retrieved from the Internet: URL:http://www.mdt.tu-berlin.de/publikatio nen/Guehmann2002/at_download/fi le_pdf [retrieved on 2009-01-19];  MARKEL T ET AL: "ADVISOR: a systems analysis tool for advanced vehicle modeling" JOURNAL OF POWER SOURCES, ELSEVIER SA, CH, vol. 110, no. 2, 22 August 2002 (2002-08-22), pages 255-266, XP004393625 ISSN: 0378-7753