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Improved emission characteristics of HCCI engine by various premixed fuels and cooled EGR

机译：通过各种预混燃料和冷却的EGR改善HCCI发动机的排放特性

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This work investigates partial HCCI (homogeneous charge compression ignition) combustion as a control mechanism for HCCI combustion. The premixed fuel is supplied via a port fuel injection system located in the intake port of DI diesel engine. Cooled EGR is introduced for the suppression of advanced autorgnition of the premixed fuel. The premixed fuels used in this experiment are gasoline, diesel, and beta-heptane. The results show that with diesel premixed fuel, a simultaneous decrease of NO_x and soot can be obtained by increasing the premixed ratio. However. when the inlet charge is heated for the improved vaporization of diesel fuel, higher inlet temperature limits the operational range of HCCI combustion due to severe knocking and high NO_x emission at high premixed ratios. Gasoline premixing shows the most significant effects in the reductions of NO_x and soot emissions, compared to other kinds of premixed fuels.
机译：这项工作研究了部分HCCI（均质充量压缩点火）燃烧作为HCCI燃烧的控制机制。通过位于DI柴油机进气口的进气口燃油喷射系统供应预混燃油。引入了冷却的EGR，以抑制预混合燃料的提前燃烧。本实验中使用的预混合燃料是汽油，柴油和β-庚烷。结果表明，使用柴油预混合燃料，可以通过提高预混合比同时降低NO_x和烟灰。然而。当加热进气以改善柴油燃料的汽化时，较高的进气温度会因严重爆震和高预混合比下的高NO_x排放而限制HCCI燃烧的运行范围。与其他类型的预混燃料相比，汽油预混在减少NO_x和烟尘排放方面显示出最显着的效果。

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