Criterion studies on low temperature combustion in high compression

目前，内燃机正在朝着清洁和高效的方向发展，包括使用可再生燃料。火焰温度的降低对于抑制氮氧化物（NOx）的形成至关重要，这减少了对废气后处理的依赖。然而，燃烧过程变得不太稳定，并且点火更难以控制。本工作旨在发现的温度标准的点火和NOx的形成下提高气缸压缩，当使用一个均匀的气缸充量，稀和稀释的废气再循环（EGR），包括使用传统的和可再生的燃料。本研究主要是一个实证研究，虽然与建模分析和先进的控制。通过建立在测试，诊断和控制方面的领先平台，部分由以前的工业和政府支持，研究旨在获得对燃料混合和点火的更好理解，以确定NOx形成的标准，电荷可燃性和易燃性，以及燃料输送和性能适用性。

Presently, internal combustion engines are transforming towards clean and efficient operations, including using renewable fuels. The lowering of the flame temperature is crucial to suppress the nitrogen oxides (NOx) formation that reduces the reliance on the exhaust gas after-treatment. However, the combustion process becomes less stable, and the ignition more difficult to control. This work intends to discovery the temperature criteria of the ignition and the NOx formation under elevated cylinder compression, when using a homogeneous cylinder charge that is lean and diluted with an exhaust gas recirculation (EGR), including using conventional and renewable fuels. This research is primarily an empirical investigation, although with the modeling analyses and advanced controls. With the leading-edge platforms in testing, diagnosis and control that are established, in part, by the previous industrial and governmental support, the research seeks to obtain improved understandings on the fuel mixing and ignition, to identify the criteria of NOx formation, the charge ignitability and flammability, and the fuel delivery and property suitability.