Combustion Control of a Swirl-Chamber Type Diesel Engine by Early Ignition of Residual Fuel from the Previous Cycle 861183

During our investigations using an ion-gap, we observed a rise of the ion-current before the injection event.We then tried to trap some portion of the fuel spray in the swirl-chamber to cause early ignition in the next cycle in order to get the effect of pilot injection.As a result, a very smooth pressure rise was attained and the objectionable knocking noise at idling was eliminated.However, we had to make compromises when taking advantage of this combustion mechanism, as there was a trade-off between noise level and HC emission.


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