Abstract
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.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
