Pneumatic-Combustion Hybrid Engine: A Study of the Effect of the Valvetrain Sophistication on Pneumatic Modes
Pneumatic-Combustion Hybrid Engine: A Study of the Effect of the Valvetrain Sophistication on Pneumatic Modes
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气动-燃烧混合发动机：气门机构复杂度对气动模式影响的研究
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Higelin
中科院分区：
文献类型：
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作者：
Pascal Brejaud;A. Charlet;Y. Chamaillard;A. Ivanco;P. Higelin
尽管内燃机显示出高的总体最大全局效率，但是在汽车应用中不能充分利用这种潜力：在真实的条件下，平均发动机负载（以及因此效率）相当低，并且在制动阶段期间动能损失。本文介绍了一种混合动力内燃机及其热力循环，它能够以压缩空气的形式储存和回收能量。研究的重点是两种主要的气动模式：气动泵模式和气动马达模式。对于每一种发动机，都考虑了三种气门机构技术：四冲程模式、一个凸轮轴脱开的四冲程模式和二冲程全可变模式。在任何情况下，气门技术是最佳燃油经济性的关键。建立了增压阀执行机构的运动学模型，并将其应用于混合动力发动机的准维模型中。模拟结果为每种气动模式，为每种气门机构技术，以确定最佳的气门机构配置，并显示运动阀致动器的发动机的性能的影响。气门机构的复杂性和燃油经济性之间的权衡将为每种情况下。
Although internal combustion engines display high overall maximum global efficiencies, this potential cannot be fully exploited in automotive applications: in real conditions, the average engine load (and thus efficiency) is quite low and the kinetic energy during a braking phase is lost. This work presents a hybrid pneumatic-combustion engine and the associated thermodynamic cycles, which is able to store and recover energy in the form of compressed air. The study focuses on the two major pneumatic modes: pneumatic pump mode and pneumatic motor mode. For each of them, three valvetrain technologies are considered: 4-stroke mode, 4-stroke mode with one camshaft disengaged, and 2-stroke fully variable.The concept can be adapted to SI or CI engines. In any case the valvetrain technology is the key to best fuel economy. A kinematic model of the charging valve’s actuator is introduced, and implemented in a quasi dimensional model of the pneumatic-combustion hybrid engine. Simulation results are presented for each pneumatic mode, for each valvetrain technology, in order to determine the best valve train configuration, and to show the impact of the kinematic valve actuator on the performance of the engine The tradeoffs between valvetrain sophistication and fuel economy will be presented for each case.