Errors of an Indicator Due to a Connecting Passage

概要

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It is often compelled to attach an indicator passage to the pressure sensitive element in measuring the cylinder pressure of an internal combustion engine. A vibration caused in the passage, however, often injures the fidelity of pressure indicated. In this paper, the gas system inside the passage was firstly studied from the viewpoint of frequency-and transient-responses, and thus the relationship between the course of pressure in cylinder and the pressure indicated was derived. Then the amplitude error due to the passage was evaluated by comparing the pressure diagrams obtained by the use of a passage, with the accurate diagrams. From these, it was confirmed that a diagram available for practical use was possibly obtained by raising the period of vibration twice as much as the rising time of pressure and by making the period lower than 2 to 3 degrees in crank angle. Further, damping effects of connecting passage were experimentally examined for improving the diagram accuracy, and an approximate formula was given to find out the optimum damping.
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