| 摘要 |
PURPOSE:To detect knocking with high accuracy, by detecting the vibration of cooling water and the variation of pressure in a water chamber, which are caused through a partition wall by knocking in the combustion chamber. CONSTITUTION:In a knocking detection device installed to a water-cooling system internal combustion engine, when knocking occurs in a combustion chamber 2, cooling water in a water chamber 4 vibrates through its knocking cylinder 3, and its vibration is detected by a vibration-detecting part 14 of a vibrometer. As a result, a bimorph element 18 of the vibrometer resonates, and the output voltage of the bimorph pressure element 18 is outputted to a terminal 19. Since the vibrometer 13 is insulated in vibration from engine blocks 1, 7 and faces the water chamber 4, the vibration of the engine blocks 1, 7 having a lot of noises is not detected and the vibration of cooling water in the water chamber 4, which scarcely has a noise is detected, therefore, the SN-ratio is raised and the detecting accuracy of knocking becomes high. |
