Abstract
The ECOS-DDF system is a diesel fuel ignition type natural gas engine, which ignites and burns the mixture of natural gas with a self-ignition flame of a small amount of diesel fuel injected directly into the combustion chamber. This engine, fitted with an EGR cooler and the new reverse-flow catalytic converter, controls the injection timing and the supply volume of natural gas and of diesel fuel respectively with the most optimized balance. As a result, it achieved nearly equal thermal efficiency to the base diesel engine, while decreasing harmful exhaust emissions.
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