| 摘要 |
PROBLEM TO BE SOLVED: To perform fail safe control for maintaining satisfactory drivability by a normal variable valve system when any of variable valve systems causes failure in an internal combustion engine provided with the variable valve systems changing valve characteristics related to effective amount of opening per a plurality of cylinder groups. SOLUTION: Valve characteristics (operation angle, lift amount) by the variable valve systems in left and right banks of the V-type internal combustion engine are detected by operation angle sensors 115L, 115R, and failure on a left bank side and a right bank side is diagnosed (B4, B5). When lift amount of the valve characteristics in a failure condition is above a predetermined value while the variable valve system in the bank on one side causes failure, control by matching the valve characteristics by the variable valve system in the normal side bank with the valve characteristics in the failure condition is performed. When lift amount is less than the predetermined value, the valve characteristics on the normal side are the valve characteristics for increasing lift amount by compensation amount set in accordance with an engine operation condition for the valve characteristics in the failure condition (B6 to B10→B2, B3). COPYRIGHT: (C)2005,JPO&NCIPI
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