Evaluation of an electric turbo compound system for SI engines: A numerical approach
Evaluation of an electric turbo compound system for SI engines: A numerical approach
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DOI：
10.1016/j.apenergy.2015.10.143
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发表时间：
2016-01
期刊：
影响因子：
11.2
通讯作者：
G. Pasini;G. Lutzemberger;S. Frigo;S. Marelli;M. Ceraolo;R. Gentili;M. Capobianco
中科院分区：
文献类型：
--
作者：
G. Pasini;G. Lutzemberger;S. Frigo;S. Marelli;M. Ceraolo;R. Gentili;M. Capobianco
在中期方案中，混合动力系统和内燃机（ICE）的小型化代表了车辆技术降低燃料消耗和CO2排放的实际趋势。关于小型化概念，为了在小型发动机中保持合理的功率水平，涡轮增压的应用对于火花点火（SI）和压缩点火（CI）发动机都是强制性的。在这方面，耦合到涡轮增压器（电动涡轮复合），以回收废气的残余能量的可能性变得越来越有吸引力，证明了世界各地的几项研究和目前的应用在F1 Championship.The本文件显示的第一个数值结果的研究计划之间的合作比萨和热那亚大学。这第一项研究的重点是评价的好处，从应用ETC（电涡轮复合）的小型双缸SI发动机（900立方厘米）。从两台涡轮机和一台压气机的实验图出发，使用AVL BOOST一维代码创建了涡轮增压发动机的完整模型。然后，考虑三个驱动循环和两种不同的车辆配置，数值活动移动到整车/动力系统建模，以验证所提出的ETC解决方案的有效性。结果表明，如果采用传统的涡轮增压器涡轮机，如果目标是优化ICE的一个特定工作点的总效率，就像增程电动车的情况一样。此外，当ICE必须提供可变功率输出时，如在传统或混合动力车辆的情况下，ETC可以略微提高平均总效率。然而，来自ETC的主要好处是在最低的发动机转速区域的升压范围的扩展和可能减少的涡轮滞后，这是关键点，在并联混合动力，特别是在传统vehicle.Concerning整车/动力系统的模拟，第一个结果表明，ETC不提高燃油经济性的小型车辆，特别是当采用在城市循环。ETC在大型车辆的情况下更具优势，特别是考虑到城市外道路或高速公路时。
In a medium term scenario hybrid powertrain and Internal Combustion Engine (ICE) downsizing represent the actual trend in vehicle technology to reduce fuel consumption and CO2emission. Concerning downsizing concept, to maintain a reasonable power level in small engines, the application of turbocharging is mandatory both for spark ignited (SI) and compression ignited (CI) engines. Following this aspect, the possibility to couple an electric drive to the turbocharger (electric turbo compound) to recover the residual energy of the exhaust gases is becoming more and more attractive, as demonstrated by several studies around the world and by the current application in the F1 Championship.The present paper shows the first numerical results of a research program in collaboration between the Universities of Pisa and Genoa. This first study is focused on the evaluation of the benefits resulting from the application of an ETC (Electric Turbo Compound) to a small twin-cylinder SI engine (900 cm3). Starting from the experimental maps of two turbines and one compressor, the complete model of a turbocharged engine was created using the AVL BOOST one-dimension code. The numerical activity then moves to the whole vehicle/powertrain modelling, considering three driving cycles and two different vehicle configurations, in order to verify the effectiveness of the proposed ETC solution.Results show that the adoption of ETC is not advantageous if used for a conventional turbocharger turbine, if the target is to optimize the overall efficiency in one specific operating point of the ICE, like in the case of range-extended electric vehicles. Besides, ETC can slightly improve the average overall efficiency when the ICE must provide variable power output, as in the case of conventional or hybrid vehicles. However, the major benefits coming from ETC are the boost range extension in the lowest engine rotational speed region and a possible reduction of turbo lag, which are key points in parallel-hybrid and especially in conventional vehicles.Concerning the whole vehicle/powertrain simulation, first results show that the ETC does not improve fuel economy of the smaller vehicle, especially when employed in urban cycles. The ETC is much more advantageous in the case of the larger vehicle, particularly when extra-urban roads or motorways are considered.