Directly Injected Natural Gas Fueling of Diesel Engines

Paper #:
  • 961671

Published:
  • 1996-08-01
Citation:
Hodgins, K., Hill, P., Ouellette, P., and Hung, P., "Directly Injected Natural Gas Fueling of Diesel Engines," SAE Technical Paper 961671, 1996, https://doi.org/10.4271/961671.
Pages:
11
Abstract:
A new injector has been designed for sequential injection of high-pressure natural gas and a quantity of liquid diesel fuel directly into diesel engine cylinders late in the compression stroke. Injected a few degrees before the natural gas, the pilot liquid fuel auto-ignites and serves, as it burns, to ignite the gaseous fuel which enters the chamber as an underexpanded sonic jet generating high local turbulence. Tests on a single-cylinder two-stroke engine with full electronic control have demonstrated the capability of this fueling method to nearly match conventional diesel engine efficiency over a wide range of load and substantially reduce the emissions of oxides of nitrogen (NOx), particulate mater (PM) and carbon dioxide (CO2).
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