| 摘要 |
PROBLEM TO BE SOLVED: To provide a failure detecting device for a variable valve system in an internal combustion engine capable of accurately detecting malfunction of a cam phase variable mechanism caused by switching inability of a lock pin, and capable of securely avoiding troubles caused by continuity of inappropriate cam phase control. SOLUTION: A vane rotor 9 is rotatably arranged inside a housing 6 of a timing pulley 4, and connected to a front end of a camshaft 3. A phase of the camshaft 3 is changed by applying oil pressure to the vane rotor 9 in accordance with switching of OCV 30, and when the vane rotor 90 is at a most delayed angle position, the lock pin 16 is switched by oil pressure to fix the vane rotor 9. When the switching of the lock pin 16 is not detected by an oil pressure sensor 41 although the vane rotor 9 is switched to the most delayed angle position, it is determined to be a failure, and phase control of the camshaft 3 is prohibited. COPYRIGHT: (C)2005,JPO&NCIPI
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