Natural Gas Engine Development: July 2003--July 2005 Page: 4 of 44
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Table of Contents
List of Tables............................................................................................................................................... v
List of Figures ............................................................................................................................................. v
List of Photos............................................................................................................................................... v
List of Acronym s and Abbreviations ..................................................................................................... vi
1.0 Executive Summary .............................................................................................................................. 1
2.0 Introduction ........................................................................................................................................... 4
2.1 Project Objective ...............................................................................................................................4
2.2 Project Participants ............................................................................................................................ 4
2.3 Project Design.................................................................................................................................... 5
3.0 Task Specifications................................................................................................................................ 8
3.1 Engine Design, Performance and Emissions (Task 3.1)....................................................................8
3.1.1 Engine Specifications..................................................................................................................9
3.1.2 Torque and Pow er Curves...................................................................................................... 11
3.1.3 Vehicle/Fleet Description..........................................................................................................19
3.1.4 Duty Cycle Description.............................................................................................................19
3.2 On-Road Engine Development (Task 3.2).......................................................................................19
3.2.1 Description of Developm ent W ork ...................................................................................... 21
3.2.2 Fuel Econom y and M ileage Accum ulation........................................................................... 21
3.2.3 Future Plans for the Engine M odel ........................................................................................ 21
3.3 FTP Results (Task 3.3) ....................................................................................................................22
3.3.1 Commercial Engine Ratings .....................................................................................................22
3.3.2 Commercial Engine Efficiency Map.........................................................................................23
3.3.3 N arrative Description of Test Results .................................................................................... 24
4.0 Conclusions ......................................................................................................................................... 28
5.0 Appendices .......................................................................................................................................... 29
Appendix A : Fleet V ehicle Specifications Form ............................................................................... 30
Appendix B: Daily Test Log.................................................................................................................. 34
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Lekar, T. C. & Martin, T. J. Natural Gas Engine Development: July 2003--July 2005, report, March 1, 2006; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc881010/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.