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Document Number

8412

Primary Title

Development of the High-Pressure Direct-Injected, Ultra Low-NOx Natural Gas Engine: Final Report

Author Affiliation

Cummins, Inc., Columbus, Indiana; Westport Innovations, Inc.

Contributing Author

Duggal, V.K.; Pike-Lyford, E.J.; Wright, J.F.; Dunn, M.; Goudie, D.; Munshi, S.

Published Date

05/01/2004

Detailed Publish Date

May 2004

Page Count

71

Document Type

SUBCONTRACT REPORT

Publisher Name

National Renewable Energy Laboratory, Golden, Colorado

Abstract

This project targeted development of a high-efficiency, low-emission natural gas engine for heavy-duty trucks. Specifically, it targeted the demonstration of a Cummins ISX engine using HPDI natural gas fueling and exhaust gas recirculation (EGR) meeting the following specifications:

  • Peak torque of 1,650 ft-lb (2,236 N-m)
  • Rated power of 450 hp (335 kW)
  • Peak thermal efficiency of 40% with typical diesel part-load efficiency
  • NOx emissions of 0.5 g/bhp-hr
  • PM emissions of 0.1 g/bhp-hr
  • Substitution of diesel with natural gas greater than 90% over the certification cycle

Testing and modeling of an otherwise unmodified Cummins ISX engine with EGR and HPDI fueling indicated that the program goals could not be met with the standard production hardware. Therefore, a turbocharger using a smaller trim compressor and a second EGR cooler were fitted to the engine along with an oxidation catalyst.

Report Number

NREL/SR-540-35911

Copyright Status

N - Not copyrighted,

Document Owner

H