As the emission legislation becomes further constraining, all manufacturers started to fulfill the future regulations about the prime movers in the market. Lean-burn gas engines operating under marine applications are also obligated to enhance the performance with a low emission level. Lean-burn gas engines are expressed as a cleaner source of power in steady loading than diesel engines, while in transient conditions of sea state, the unsteadiness compels the engine to respond differently than in the steady-state. This response leads to higher fuel consumption and an increase in emission formation. In order to improve the stability of the engine in transient conditions, this study presents a concept implementing a hybrid configuration in the propulsion system. An engine model is developed and validated in a range of load and speed by comparing it with the available measured data. The imposed torque into the developed engine model is smoothed out by implementing the hybrid concept, and its influence on emission reduction is discussed. It is shown that with the hybrid propulsion system, the NO_X reduces up to 40% because of the maximum load reduction. Moreover, eliminating the low load operation by a Power Take In during incomplete propeller immersion, the methane slip declines significantly due to combustion efficiency enhancement.

随着排放法规的进一步限制，所有制造商都开始遵守有关市场中原动力的未来法规。在船舶应用下运行的稀薄燃烧发动机也有义务以低排放水平提高性能。在稳态负载下，稀薄燃烧式燃气发动机被表示为比柴油发动机更清洁的动力来源，而在海况瞬态条件下，不稳定性迫使发动机的响应与稳态相比有所不同。该响应导致更高的燃料消耗和排放物形成的增加。为了提高发动机在瞬态条件下的稳定性，本研究提出了一种在推进系统中实施混合动力配置的概念。通过将发动机模型与可用的测量数据进行比较，可以在一定的负载和速度范围内开发和验证发动机模型。通过实施混合动力概念，可以平滑已开发的发动机模型中的施加扭矩，并讨论了其对减排的影响。结果表明，在混合动力系统中，NO由于最大程度地减少了负载，_X最多减少了40％。此外，通过在不完全的螺旋桨浸没期间通过动力接管消除了低负荷运行，由于燃烧效率的提高，甲烷漏失显着下降。