| 摘要 |
PROBLEM TO BE SOLVED: To provide a control system for an internal combustion engine capable of performing not only failure diagnosis of a sensor itself but also failure diagnosis of a transmission mechanism by suitably arranging a plurality of sensors in a valve operating characteristic varying mechanism for continuously changing a lift amount of an intake valve. SOLUTION: A control shaft 56 of a first valve operating characteristic varying mechanism is provided with a control shaft rotational angle sensor 14 for detecting a rotational angle of the shaft, and an output shaft 43a of a motor 43 for driving the control shaft 56 through the transmission mechanism 71 is provided with a motor output shaft rotational angle sensor 72 for detecting a rotational angle of the shaft. Failure diagnosis of the sensors 14, 72 and the transmission mechanism 71 is performed based on the detection values of the sensors 14 and 72. COPYRIGHT: (C)2010,JPO&INPIT
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