Hydrogen can be used as a fuel for internal combustion engines to realize a carbon-neutral transport society. By extending the lean limit of spark ignition engines, their efficiency, and emission characteristics can be improved. In this study, stratified charge combustion (SCC) using monofueled hydrogen direct injection was used to extend the lean limit of a spark ignition engine. The injection and ignition timing were varied to examine their effect on the SCC characteristics. An engine experiment was performed in a spray-guided single-cylinder research engine, and the nitrogen oxide and particulate emissions were measured. Depending on the injection timing, two different types of combustion were characterized: mild and hard combustion. The advancement and retardation of the ignition timing resulted in a high and low combustion stability, respectively. The lubricant-based particulate emission was attributed to the in-cylinder temperature and area of the flame surface. Therefore, the results of the study suggest that the optimization of the hydrogen SCC based on the injection and ignition timing could contribute to a clean and efficient transport sector.

氢气可作为内燃机燃料，实现碳中和交通社会。通过扩展火花点火发动机的稀薄极限，可以提高它们的效率和排放特性。在这项研究中，使用单燃料氢气直接喷射的分层充气燃烧 (SCC) 被用于扩展火花点火发动机的贫油极限。改变喷射和点火正时以检查它们对 SCC 特性的影响。在喷雾引导的单缸研究发动机上进行了发动机实验，并测量了氮氧化物和颗粒物排放。根据喷射时间，两种不同类型的燃烧具有特征：轻度燃烧和强燃烧。点火正时的提前和延迟导致燃烧稳定性的高低，分别。基于润滑剂的颗粒排放归因于缸内温度和火焰表面面积。因此，研究结果表明，基于喷射和点火正时的氢气 SCC 优化有助于实现清洁高效的运输部门。