In this study, cycle-skipping was investigated for a natural gas engine which has single cylinder, unsupercharged with 1.16 L volume and spark ignition. Additionally, inlet manifold air was switched off during cycle-skipping to minimize pumping losses. Thus, cycle-skipping strategy was carried out, and its effects on emission and engine performance were investigated. Indicated mean effective pressure, indicated efficiency, specific emissions (CO, HC, and NO_X) and combustion characteristics (in-cylinder pressure and rate of heat release) were investigated in the study. As a result of performed study, it is predicted that a significant improvement can be achieved in indicated thermal efficiency as 22.8% and 13.4% by different cycle-skipping strategies. However, there is not a continuous change in emissions for different cycle-skipping strategies. While CO and NO_X emissions increased in 3N1S (three normal, one cycle-skip) condition, HC emissions decreased in accordance with normal condition. For both cycle-skipping strategies, all the emissions have an increase in accordance with normal condition. In 3N1S and 2N1S (two normal, one cycle-skip) cycle skip engine operating conditions, compared to engine operating under normal condition, CO emissions increased by 14.7 and 51.7 times, respectively. In terms of HC emissions, while emission values decreased by 27.8% under 3N1S operating conditions, they increased by 67.2% under 2N1S operating conditions. Finally, in 3N1S and 2N1S cycle skip engine operating conditions, NOx emissions increased by 3.7 and 6.9 times, respectively, compared to normal operating condition. Another significant result of this study is that peak in-cylinder pressure increased as the cycle-skipping rate increased.

在本研究中，对具有单缸、非增压、1.16 升容积和火花点火的天然气发动机进行了跳循环研究。此外，在跳过循环期间，进气歧管空气被关闭，以最大限度地减少泵送损失。因此，采用了跳循环策略，并研究了其对排放和发动机性能的影响。研究中对指示平均有效压力、指示效率、特定排放量（CO、HC 和 NO _X）和燃烧特性（缸内压力和放热率）进行了调查。研究结果表明，通过不同的跳周期策略，预计热效率可显着提高，分别为 22.8% 和 13.4%。然而，不同的跳周期策略的排放量并没有持续变化。3N1S（三个正常，一个周期跳跃）工况下CO和NO _{X排放量有所增加，而HC排放量则与正常工况相比有所下降。}对于两种跳周期策略，所有的排放量都比正常情况有所增加。在3N1S和2N1S（两种正常，一种跳过循环）循环跳跃发动机工况下，与正常工况下的发动机相比，CO排放量分别增加了14.7倍和51.7倍。在HC排放方面，3N1S工况下排放值下降了27.8%，而2N1S工况下排放值增加了67.2%。最后，在3N1S和2N1S循环跳跃发动机工况下，与正常工况相比，NOx排放量分别增加了3.7倍和6.9倍。这项研究的另一个重要结果是，峰值缸内压力随着跳周率的增加而增加。