| 摘要 |
PROBLEM TO BE SOLVED: To detect opening/closing abnormality of a valve which opens and closes an oil passage with high precision.SOLUTION: A hydraulic pressure introduction port 71a of an OSV 7 is linked to a main oil hole 21, and a valve pressure port 71b of the OSV 7 is linked to a back pressure space 81 of an oil jet switching valve 8. When the OSV 7 is ON, the respective ports 71a, 71b are linked to each other and the oil jet switching valve 8 is closed to stop jetting oil, and when the OSV 7 is OFF, the respective ports 71a, 71b are closed and the oil jet switching valve 8 is opened to jet oil. When the OSV 7 is switched, a hydraulic pressure sensor 105 senses change in hydraulic pressure of the main oil hole 21 in the switching of the OSV 7 and when the amount of change in hydraulic pressure is equal to or less than a predetermined amount, it is determined that the opening/closing operation of the oil jet switching valve 8 is abnormal. |
