圧力取出し管によるインジケータの誤差

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  • Errors of an Indicator Due to a Connecting Passage
  • アツリョク トリダシ カン ニ ヨル インジケータ ノ ゴサ

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An indicator passage is often oblized to be attached to the pressure sensing element in measuring cylinder pressure of an internal combustion engine. A vibration caused in the passage, however, often injures fidelity of pressure indicated. In this paper, the gas system inside the passage was firstly studied on 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 an passage, with accurate diagrams. From these, it was experienced that the diagram available for practical use was possibly obtained by raising the period of vibration twice as much as the rising time of pressure rise and by making the period lower than 2 to 3 degrees in crank angle. Further, damping effect of connecting passage or throttling was experimentally examined for improving the diagram accuracy, and an approximate formula was given to find out the optimum damping.

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