Emission Control with Lean Operation Using Hydrogen-Supplemented Fuel
Date Published: 1974-02-01
Paper Number:740187
DOI: 10.4271/740187
Citation:
Stebar, R. and Parks, F., "Emission Control with Lean Operation Using Hydrogen-Supplemented Fuel," SAE Technical Paper 740187, 1974, doi:10.4271/740187.
Author(s):
R. F. Stebar - Research Labs., General Motors Corp.
F. B. Parks - Research Labs., General Motors Corp.
Hydrogen-supplemented fuel was investigated as a means of extending lean operating limits of gasoline engines for control of NO
x
. Single-cylinder engine tests with small additions of hydrogen to the fuel resulted in very low NO
x
and CO emissions for hydrogen-isooctane mixtures leaner than 0.55 equivalence ratio. Significant thermal efficiency improvements resulted from the extension beyond isooctane lean limit operation. However, HC emissions increased markedly at these lean conditions.
A passenger car was modified to operate at 0.55-0.65 equivalence ratio with supplemental hydrogen. Vehicle emissions, as established by the 1975 Federal Exhaust Emissions Test, demonstrated the same trends as the single-cylinder engine tests.
The success of the hydrogen-supplemented fuel approach will ultimately hinge on the development of both a means of controlling hydrocarbon emissions and a suitable hydrogen source on board the vehicle. Reported efforts to develop a satisfactory onboard hydrogen generator (gasoline reformer) appear restricted by fuel economy considerations.
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