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首页> 外文期刊>SAE International Journal of Alternative Powertrains >Investigation of Combustion Optimization Control Strategy for Stable Operation of Linear Internal Combustion Engine-Linear Generator Integrated System
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Investigation of Combustion Optimization Control Strategy for Stable Operation of Linear Internal Combustion Engine-Linear Generator Integrated System

机译：线性内燃机-线性发电机集成系统稳定运行的燃烧优化控制策略研究

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摘要

The linear internal combustion engine-linear generator integrated system (LICELGIS) is an innovative structure as a range-extender for the hybrid vehicles, which contains two opposed free piston engines and one linear generator between them. The LICELGIS is a promising power package due to its high power density and multi-fuel flexibility. In the combustion process of linear engines, the top dead center (TDC) position is not stable in different cycles, which significantly affects system operations. Otherwise, pistons move away from the TDC with high-speed because of the tremendous explosive force, which incurs the short residence time of pistons around the TDC and rapid decrease of in-cylinder temperature, pressure and the combustion efficiency. In order to address this problem, a scientific simulation model which includes dynamic and thermodynamic models, is established and a combustion optimization control strategy is proposed. The control strategy is based on the variable electromagnetic resistance force of the system. The electromagnetic resistance force is predictive and adjustable based on the velocity of midpoint and piston displacement. The simulation results indicate that under this control strategy, the TDC position is stable in different cycles and the power of the linear engine in one working cycle increased 5.6% than that without this control strategy. The control strategy based on combustion law and compression ratio of different fuels should be useful to control the piston trajectory around the TDC or even the whole cycle to realize high-efficiency combustion of different fuels.
机译：线性内燃机-线性发电机集成系统（LICELGIS）是一种创新的结构，可作为混合动力汽车的增程器，它包含两个相对的自由活塞发动机和一个线性发电机。 LICELGIS具有高功率密度和多种燃料的灵活性，因此是有前途的动力包。在线性发动机的燃烧过程中，上止点（TDC）位置在不同循环中不稳定，这会严重影响系统运行。否则，由于巨大的爆炸力，活塞将高速离开TDC，这导致活塞在TDC周围的停留时间较短，并且缸内温度，压力和燃烧效率迅速降低。为了解决这个问题，建立了包括动力学和热力学模型的科学仿真模型，并提出了燃烧优化控制策略。控制策略基于系统的可变电磁阻力。电磁阻力是可预测的，并且可以根据中点的速度和活塞的位移进行调整。仿真结果表明，在该控制策略下，TDC位置在不同周期下均保持稳定，线性发动机在一个工作周期内的功率比未使用该控制策略时提高了5.6％。基于燃烧规律和不同燃料压缩比的控制策略应有助于控制TDC周围甚至整个循环的活塞轨迹，以实现不同燃料的高效燃烧。

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