Browse Publications Technical Papers 2018-32-0032
2018-10-30

Development of Coaxial Thin Film Temperature Sensor with Improved Measurement Accuracy Based on Principle of Thermoelectromotive Force 2018-32-0032

In recent years, improvement of fuel consumption and thermal efficiency is strongly required in the internal combustion engine to promote environmental. It is important to clarify the mechanism and reduce of cooling loss, however it is very difficult to measure cooling loss (heat transfer coefficient) from the working gas to combustion chamber wall. Measuring experimentally heat flux from chamber surface to coolant is one of evaluation methods of the cooling losses in the combustion chamber and has been widely used for R&D process in IC engines. Although this method has capability to measure detail of cooling process instantaneously and accurately including local phenomena, but it is necessary to improve the S/N ratio and responsiveness and durability. In order to solve these problems and evaluate cooling loss in combustion chamber of internal combustion engines with higher response and accuracy than previously, authors developed newly coaxial type thin-film temperature sensor which thin film fabrication technology based on PVD method (physical vapor deposition method). In the authors' previous paper, it was reported about development of measurement system for low noise measurement, and evaluation method and result of instantaneous responsiveness, and change of thin film material on sensor surface for durability improvement. In this paper, it was evaluated the frequency characteristics of wall temperature measurement results during operation of the engine and investigate the response characteristics necessary for this sensor. In addition, it was investigated the measurement errors occurred based on the thermocouple principle of thermocouples by changing the thin-film materials mentioned above, and its errors was evaluated from numerical analysis and experiment.

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