| 摘要 |
PROBLEM TO BE SOLVED: To rapidly measure the volume of a combustion chamber, having a complicated shape in a dried state, as it is, with high accuracy, in an engine manufacturing process. SOLUTION: A reference vessel is mounted on the combustion chamber of a transferred engine head block. An alternating volume change is given differentially to the spaces inside the reference vessel and the combustion chamber by a loudspeaker, the output of a second microphone for detecting the sound pressure, at a place where the sound pressure inside the communication pipe communicating through the space inside the reference vessel and the space inside the combustion chamber is rectified synchronously by the output of a first microphone for detecting the sound pressure in the reference vessel. The volume difference between the combustion chamber and a standard vessel is determined from a signal that is synchronously rectified, when the reference vessel is mounted to the standard vessel and a signal synchronously rectified, when the reference vessel is mounted to the combustion chamber. COPYRIGHT: (C)2006,JPO&NCIPI
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