| 摘要 |
PROBLEM TO BE SOLVED: To suppress occurrence of an overshoot or residual deviation, regardless of a change in viscosity of working fluid or an mechanical manufacturing error. SOLUTION: Based on deviationΔVθbetween a target value Vθ<SB>T</SB>relating to a position of a displacement part (rotor 29) of a variable valve timing mechanism 25 and an actual measurement value Vθ<SB>A</SB>, first controlled variables UNL are calculated by a sliding mode control, and second controlled variables UL are calculated by integration by using the deviationΔVθas an input, when the deviationΔVθis within a predetermined numerical rangeΔVθ<SB>range</SB>including a zero value. On the other hand, when the deviationΔVθis not within the numerical rangeΔVθ<SB>range</SB>, the second controlled variables UL are calculated by integration using a zero value as an input, and the first controlled variables UNL and second controlled variables UL are added to set correction controlled variables VUCDTY for correcting a position of the displacement part. COPYRIGHT: (C)2008,JPO&INPIT
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