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Closed-loop combustion phase control for multiple combustion modes by multiple injections in a compression ignition engine fueled by gasoline-diesel mixture

机译:在汽油-柴油混合物供油的压燃发动机中通过多次喷射实现多种燃烧模式的闭环燃烧阶段控制

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Partially premixed combustion with low octane fuel aims to reduce NO and soot emission simultaneously without fuel consumption penalty. Cylinder pressure based combustion phase control is an essential technology for partially premixed combustion. A novel closed-loop combustion phase control strategy for multiple combustion modes is proposed in the current study. The combustion modes are classified into three basic categories based on injection patterns and heat release stages: (1) with only one heat release stage; (2) with two separated heat release stages; (3) with two overlapped heat release stages. Crank angle when 50% fuel is consumed (CA50) is chosen as the combustion phase indicator for the first case. Start of combustion (SOC) of each heat release stage is the combustion phase indicator for the second case. Both SOC and CA50 are the combustion phase indicators for the third case. Each combustion phase is closed-loop controlled by a proportional integral (PI) controller with the timing adjustments of the corresponding injection. The control strategy is verified under different operating conditions in a 1.9 L light duty diesel engine fueled by gasoline-diesel mixture (volumetric 70% gasoline, 30% diesel). The experimental results show that the control strategy is able to control the combustion phase, reduce cylinder to cylinder variations as well as cycle to cycle variations under the operating conditions with exhaust gas circulation (EGR) rates of 10% and 15%.
机译:低辛烷值燃料的部分预混合燃烧旨在同时减少NO和烟尘排放,而不会降低燃料消耗。基于气缸压力的燃烧相位控制是部分预混燃烧的一项必不可少的技术。在当前的研究中,提出了一种用于多种燃烧模式的新型闭环燃烧阶段控制策略。根据喷射方式和放热阶段,燃烧模式分为三个基本类别:(1)只有一个放热阶段; (2)具有两个分开的放热阶段; (3)具有两个重叠的放热阶段。第一种情况下,选择消耗50%燃料时的曲轴转角(CA50)作为燃烧阶段指示器。每个放热阶段的燃烧开始(SOC)是第二种情况下的燃烧阶段指示器。 SOC和CA50均为第三种情况下的燃烧阶段指标。每个燃烧阶段均由比例积分(PI)控制器进行闭环控制,并调整相应喷射的时间。在不同的工况下,采用汽油-柴油混合物(体积分数为70%的汽油,30%的柴油)作为燃料的1.9升轻型柴油发动机,验证了该控制策略。实验结果表明,该控制策略能够控制燃烧阶段,减少汽缸之间的变化,并在排气循环(EGR)率为10%和15%的工况下减少循环之间的变化。

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