不同燃料/润滑油组合下火花塞沉积物形成机理的建模和参数识别

Garima Kushwaha, Samir Saraswati, Bireswar Paul
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引用次数: 0

摘要

模型参数的确定非常复杂,需要许多近似值和实验室研究。这里提出了一种识别这些参数的新方法,即使用实验数据和参数估计方法来最小化由预测和实验沉积厚度之间误差构成的成本函数。针对不同的汽油乙醇混合物和润滑油确定了参数。与此同时,还对沉积物的热特性和电特性进行了研究,并将这些特性与确定的参数一起用于提取有关火花塞上沉积物形成的可能来源、机制和其他影响因素及其特性的信息。研究发现,沉积物形成模型和确定的参数有可能可靠地估计沉积物随时间的增长,因为在所有燃料和润滑油中,火花塞沉积物质量的测量值和预测值之间存在良好的相关性。火花塞沉积物的热导率和电导率随乙醇含量和机油粘度的增加而增加,从而导致侧火花发生的几率增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling and Parameter Identification of Spark Plug Deposit formation mechanism for Different Fuel/Lubricant Combination
The identification of model parameters is complex and requires many approximations and laboratory investigations. Here, a novel approach of identifying these parameters is proposed, that uses experimental data, and a parameter estimation method to minimize a cost function made up of errors between the predicted and experimental deposit thickness. The parameters are identified for different gasoline-ethanol blends and lubricants. Concomitantly, the study of thermal and electrical properties of deposits is done, which along with the identified parameters are used to extract information about the possible sources, mechanisms and other factors that will affect deposit formation on the spark plug and its characteristics. It is found that the deposit formation model along with the identified parameters has the potential to reliably estimate the deposit growth with time as good correlations have been observed between measured and predicted spark plug deposit mass for all fuels and lubricants. The thermal and electrical conductivity of spark plug deposit increases with high ethanol fraction and high viscous oil that consequence in increased chances of side sparking.
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