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An Innovative Hybrid Powertrain for Small and Medium Boats

机译：用于中小船的创新混合动力动力

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Hybridization is a mainstream technology for automobiles, and its application is rapidly expanding in other fields. Marine propulsion is one such field that could benefit from electrification of the powertrain. In particular, for boats to sail in enclosed waterways, such as harbors, channels, lagoons, a pure electric mode would be highly desirable. The main challenge to accomplish hybridization is the additional weight of the electric components, in particular the batteries. The goal of this project is to replace a conventional 4-stroke turbocharged Diesel engine with a hybrid powertrain, without any penalty in terms of weight, overall dimensions, fuel efficiency, and pollutant emissions. This can be achieved by developing a new generation of 2-Stroke Diesel engines, and coupling them to a state-of-the art electric system. For the thermal units, two alternative designs without active valve train are considered: opposed piston and loop scavenged engines. The design of the alternative engines is carried out through CFD simulations. The CFD has been calibrated and validated using experimental data from single-cylinder loop scavenged engine. The study demonstrates that the new Loop scavenged engine with a 23 kWh battery pack and an Opposed Piston design with a 15 kWh battery pack can meet the goals of the project while providing 5% and 10% fuel efficiency improvement at cruise conditions respectively, in comparison to the reference 4-stroke engine.
机译：杂交是汽车的主流技术，其应用在其他领域正在迅速扩展。海洋推进是一种可以从动力系的电气中受益的一个这样的领域。特别是，对于在封闭的水道中驾驶船，例如港口，通道，泻湖，纯电动模式是非常理想的。实现杂交的主要挑战是电气部件的额外重量，特别是电池。该项目的目标是用混合动力动力制品取代传统的4行程涡轮增压柴油发动机，在重量，总体尺寸，燃料效率和污染物排放方面没有任何罚款。这可以通过开发新一代的2行程柴油发动机来实现，并将它们耦合到最先进的电力系统。对于热单元，考虑了两种没有主动阀门系的替代设计：相对的活塞和循环清除发动机。替代引擎的设计通过CFD仿真进行。使用单缸环清除发动机的实验数据校准并验证了CFD。这项研究表明，新的循环清除了23千瓦时电池组和一个对置活塞设计，具有15千瓦时电池组，可满足该项目的目标发动机，而在巡航条件下分别提供5％和10％的燃料效率改进，在比较到参考4行程发动机。

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