首页> 外文期刊>日本機械学会論文集. C編 >薄膜型熱電対を用いた内燃機関の燃焼室壁表面瞬間温度計測システム
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薄膜型熱電対を用いた内燃機関の燃焼室壁表面瞬間温度計測システム

机译:薄膜热电偶用于内燃机燃烧室壁面瞬时温度测量系统

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摘要

内燃機関の燃焼室内ガスから燃焼室壁面への熱損失状態を把握する事は熱効率向上を図る上で重要な手掛かりとなる.サイクル中の燃焼室壁面への瞬間的な流入熱量を評価するためには薄膜型熱電対(Thin-Film Thermocouple,以下TFTと称す)を用いて燃焼室壁表面の瞬間温度を計測し,その結果を基に熱量解析を行うことで瞬時熱流束を算出する方法が有効である.%The state of heat loss from combustion gas to combustion chamber walls during the cycle in an internal combustion engine can be evaluated from instantaneous surface temperature of the walls measured by thin-film thermocouples (TFTs). Not only a suitable temperature probe but also an appropriate measurement system is necessary for accurate measurement. TFTs developed by the authors' group were designed and fabricated so that disturbance of the temperature filed could be minimized when they were embedded into combustion chamber walls. Appropriate measurement circuits and devices are necessary for accurate measurement of thermoelectromotive force generated by the TFTs because it changes very quickly as the crank angle, and the amplitude of its fluctuation is considerably small, usualy less than 3 mV. Therefore, the authors' group established a measurement system which consists of measurement circuits of thermoelectromotive force, an A/D (analog to digital conversion) system and a data processing device. The authors' measurement circuit has an advantage of being noise-free and quick in switching channels. On the other hand, the A/D system is of high accuracy and synchronizes with the engine operation. Furthermore, meaningfully reproductive data is generated by the data processing device. In this report, the authors' measurement system is presented.
机译:了解从内燃机燃烧室中的气体到燃烧室壁表面的热损失状态是提高热效率的重要线索。为了评估在循环期间输入到燃烧室壁的瞬时热量,薄膜热电偶(TFT)用于测量燃烧室壁表面上的瞬时温度。通过进行基于热量的分析来计算瞬时热通量是有效的。内燃发动机在循环期间从燃烧气体到燃烧室壁的热损失状态可以通过薄膜热电偶(TFT)测量的壁的瞬时表面温度来评估。设计和制造了由作者小组开发的,用于精确测量TFT所必需的合适的测量电路和设备,以便在将温度场嵌入到燃烧室壁中时可以将对温度场的干扰降到最低。 TFT产生的热电动势是因为它随着曲柄角变化非常快,并且其波动幅度很小,通常小于3 mV。因此,作者团队建立了一个由热电动势测量电路组成的测量系统,A / D(模拟到数字转换)系统和数据处理处理装置。作者的测量电路具有无噪音,切换通道快捷的优点;另一方面,A / D系统具有很高的精度并与发动机运行同步。Excel可以产生有意义的生殖数据。在报告中,提出了作者的评估系统。

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