Measurement of Cylinder Gas Temperature of Internal Combustion Engines

概要

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All the techniques that have been previously developed for unsteady-state determination of cylinder gas temperature are used exclusively for measuring comparatively higher gas temperature with spatial variation existing in a cylinder such as flame or combustion gas temperature. This paper introduces a new method for the determination of average gas temperature in a cylinder during compression and expansion strokes. The principle is as follows : At the maximum or minimum point of the fluctuating temperature of a thin metallic wire exposed to gas, the wire temperature agrees with gas temperature, thus giving a basic temperature to determine gas temperature at the other points using the equation of state in conjunction with an indicator diagram, in so far as the maximum or minimum temperature is representative of the temperature of the whole gas in a cylinder. The temperature data taken on a two-stroke diesel engine by employing a platinum resistance thermometer are presented. The principle of this method is verified by the test results obtained in motoring. The results of the firing tests show that the minimum temperature appearing in a compression stroke indicates average gas temperature, which is applicable as the basic temperature, while the maximum temperature occurring in an expansion stroke scarcely represents everage temperature.
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