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Potential of Modern Diesel Engines with Lowest Raw Emissions - a Key Factor for Future CO_2 Reduction

机译：现代柴油发动机具有最低原料排放的潜力 - 未来CO_2减少的关键因素

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摘要

e high-speed DI-diesel engine has made a significant advance since the beginning of the 90's in the Western European passenger car market. Apart from the traditional advantage in fuel economy, further factors contributing to this success have been significantly improved performance and power density, as well as the permanent progress made in acoustics and comfort. In addition to the efforts to improve efficiency of automotive powertrains, the requirement for cleaner air increases through the continuous worldwide restriction of emissions by legislative regulations for diesel engines. Against the backdrop of global climate change, significant reduction of CO_2 is observed. Hence, for the future, engine and vehicle concepts are needed, that, while maintaining the well-established attractive market attributes, compare more favorably with regard to fuel consumption. A substantial step towards improvement of the mileage in passenger car diesel engines is analogous to the tendency on the gasoline counterparts, the reduction in cylinder displacement, in other words "downsizing." Strategies for the realization of downsizing concepts and their effect on fuel consumption and emissions have already been discussed in numerous publications. The open questions, however, are the extent to which cylinder displacement should be lowered in the future and the resulting specific power achievable. In the scope of this paper, the potential for further increase in specific power of passenger car diesel engines is analyzed and discussed. Here, feasible measures are brought under consideration, in order to obtain maximum possible specific power, at lowest emissions and minimized fuel consumption. In this article, the downsizing degrees are shown as a function of specific power, along with the consequences they have on engine-out emissions and process efficiency. The displayed results are based on systematic theoretical treatment and detailed CFD simulations for air flow, charge motion and combustion. It represents in-cylinder investigation, as well as forecasting test cycle simulations for targeted vehicle applications.
机译：E高速二柴油发动机自90年代轿车市场开始以来取得了重大进展。除了燃料经济经济中的传统优势之外，贡献这一成功的进一步因素已经显着提高了性能和功率密度，以及在声学和舒适性的永久进展。除了提高汽车电力效率的努力之外，还通过柴油发动机的立法法规对清洁空气的要求增加。在全球气候变化的背景下，观察到CO_2的显着减少。因此，对于未来，需要发动机和车辆概念，即在保持良好的有吸引力的市场属性的同时，在燃料消耗方面比较有利地比较。迈向乘用车柴油发动机的里程的大幅走动类似于汽油对应的趋势，换句话说“缩小化”。在许多出版物中已经讨论了实现缩小概念的策略及其对燃料消耗和排放的影响。然而，打开的问题是在未来应该降低气缸位移的程度，并且可以实现所得的特定功率。在本文的范围内，分析并讨论了乘用车柴油发动机特定功率进一步增加的潜力。在此，正在考虑可行的措施，以便在最低排放中获得最大可能的特定功率，并最小化燃料消耗。在本文中，缩小规模是作为特定功率的函数，以及它们对发动机排放和工艺效率的影响。显示的结果基于系统的理论处理和用于空气流动，充电运动和燃烧的CFD模拟。它代表了缸内调查，以及预测针对目标车辆应用的试验周期模拟。

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