الفهرس 
Natural Gas and pollutant emissionsOnly 14 pages are availabe for public view
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Abstract
The Natural Gas fuel conversions in Egypt use a simple gas mixer and
perhaps a simple change in Ignition system. Meanwhile these have been
moderately successful to reduce fuel consumption and vehicle emissions as
well. These conversions will not compete with modern vehicles that offer
fully electronically controlled fuel injection and ignition systems
(MOTRONIC). So, a new technique has been developed in this research.
The test engine designed to run with both injected gasoline and injected
CNG with the same gasoline injectors. A reliable and robust test rig has
been constructed to allow performance, combustion behavior and emission
measurements for both injected CNG and Gasoline fueled engine. This
research is mainly concerned with comparing the emissions and pressure
diagrams of (S I E) running with the two different injected fuels at idle
speed in three different test conditions. These conditions cover the main
reasons that cause higher pollution levels in Egypt namely; variable Ignition
advance timing, warming-up phase, variable Engine intake-air
temperatures.
Engine is successfully operated with injected eNG in all test conditions
and the following main points are achieved:
- Engine operated with eNG produces emission levels better than even the
international standards without the need for exhaust after treatment
(Catalyst).
- The techniques followed in this research facilitate further electronic
control for injected CNG fueled engines .
- In the CNG Bl-fueled engines the continuo adaptation of the sparktiming
advance must not be ignored where more timing advance is
needed for CNG fueled engines