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Examination of combustion characteristics and phasing strategies of a natural gas HCCI engine

机译：天然气HCCI发动机的燃烧特性检查和定相策略

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Controlling autoignition timing over a wide range of speeds and loads is challenging. Overcoming this challenge in practical HCCI engines requires an improved understanding of the in-cylinder processes and how these processes can be favorably altered by various control techniques. In the current study, a zero-dimensional thermodynamic model that contains a simple heat release sub-model and an autoignition model was used in a predictive fashion to better understand the in-cylinder processes and the efficiency potential of a natural gas engine in the HCCI mode. The model was also used for parametric studies to evaluate HCCI control strategies that can be tested on the research engine. The results indicated that if the initial conditions of the mixture are known precisely at intake valve closing, the autoignition timing is controllable. A thermal efficiency close to 0.45 is possible with an IMEP range from 4 to 5 bar for the described engine, also.
机译：在广泛的速度和负载范围内控制自动点火正时具有挑战性。为了克服实际HCCI发动机中的这一挑战，需要对缸内过程以及如何通过各种控制技术有利地更改这些过程有更好的了解。在当前研究中，以预测方式使用了包含简单放热子模型和自燃模型的零维热力学模型，以更好地了解HCCI中的缸内过程和天然气发动机的效率潜力模式。该模型还用于参数研究，以评估可在研究引擎上测试的HCCI控制策略。结果表明，如果在进气门关闭时准确知道混合物的初始条件，则自动点火正时是可控的。对于所述发动机，IMEP在4至5巴的范围内，热效率也可以接近0.45。

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