Development of Compression Ignition Combustion Control by Use of Two Different Reactivity Fuels and Its Application

本研究探讨了预混充量压燃式发动机燃烧控制的可能性，采用两种不同的反应性燃料，一种是反应性较低的燃料从进气道供给，而反应性较高的燃料直接喷入燃烧室。 在该系统中，我们开发了一个理解的反应性之间的关系，两种燃料的燃烧室中的总燃烧率，此外，实验结果表明，预混合燃料的化学反应影响的直接喷射燃料的点火。另一种候选方案是，在更高的反应性燃料作为预混合物和直接喷射用于提供较少的反应性燃料。 结果表明，该系统可显著降低预混合产生的未燃排放，并与废气再循环相结合，可实现较高的热效率和较低的污染物排放。

This study has explored the possibility of combustion control in premixed charge compression ignition engines which use two different reactivity fuels.One candidate is a system in which less reactive fuel is supplied from intake port while more reactive one is directly injected into a combustion chamber. In this system, we developed an understanding of the relation between reactivity of two fuels and overall combustion rate in a chamber and in addition, the experimental result shows that the chemical reaction of premixed fuel affect the ignition of directly-injected fuel.Another candidate is one in which more reactive fuel is used as pre-mixture and direct injection is used to supply less reactive fuel. It is found that this system can dramatically reduce unburned emissions yielded from pre-mixture and simultaneous higher thermal efficiency and lower pollutant emissions can be achieved by combining with exhaust gas recirculation.