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Experimental Investigations on the Performance and Cold Starting Characteristics of a Low Compression Ratio Diesel Engine

机译：低压缩比柴油发动机性能和冷启动特性的实验研究

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摘要

In this experimental work, the potential advantages of lowering the Compression Ratio (CR) of a diesel engine in terms of performance, combustion and emission related parameters along with the analysis and improvement in its cold starting characteristics are presented. The CR of a single cylinder direct injection common rail diesel engine used for light-duty automotive applications was lowered from 18:1 to 14:1 by suitable modifications to the combustion bowl while retaining its shape. The engine with both the CRs was tested on a dynamometer rig under similar operating and fuelling conditions. Additionally, experiments were carried out to determine the extent to which in-cylinder smoke emissions can be reduced when the Nitric Oxide (NO) levels of 14 CR are matched to the higher levels seen in 18CR. In order to evaluate cold start ability and idling stability of the engine with a reduced CR (14:1), the engine was instrumented inside a cold chamber. The engine was soaked at different low temperatures ranging from 25 °C to -7 °C and experiments were performed to determine its cold start ability. The effects of injection scheduling and injection quantity on cold start ability are determined with the help of an open engine controller. Further, the improvement on start ability with the help of a grid heater was also evaluated.
机译：在这个实验工作，降低柴油发动机的压缩比（CR）在性能，燃烧并在其冷起动特性的分析和改进以及与排放有关的参数方面的潜在优势呈现。单个气缸直接喷射共轨柴油发动机的用于轻型汽车应用中CR是从18降低：1至14：1通过适当的修改，以燃烧碗，同时保持其形状。同时与CR的该发动机上相似的运行和燃料供给的条件下测力计钻机测试。另外，进行了实验，以确定哪个缸内可以时14 CR的一氧化氮（NO）的水平被匹配到在可见的18Cr的更高水平被降低碳烟排放的程度。为了评价冷起动能力并具有减少的CR（14：1）发动机空转稳定性，发动机仪表冷室的内部。发动机以不同的低温度范围从25℃至-7℃，并进行实验，以确定其冷启动能力浸泡。注射调度和注射量的冷启动能力的影响与开放的发动机控制装置的帮助下确定。此外，在与格栅加热器的帮助下启动能力的提高也进行了评价。

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