| 摘要 |
PROBLEM TO BE SOLVED: To quickly learn a reference phase upon start in a variable valve timing device with an intermediate lock mechanism. SOLUTION: The variable valve timing device 18 with the intermediate lock mechanism 50 learns an intermediate lock phase as a reference phase when a VCT phase is locked at the intermediate lock phase with engine start in a state where the VCT phase is locked to the intermediate lock phase upon start taken into account, operates actual VCT phase and target VCT phase with an intermediate lock phase learning value set as the reference phase, and executes feedback control of control duty of a hydraulic control valve 25 so as to make the actual VCT phase agree with the target VCT phase. Consequently, the reference phase (intermediate lock phase) can be quickly learned upon start, and a situation where VCT phase is controlled while the reference phase (intermediate lock phase) is not clear after start is avoided. COPYRIGHT: (C)2011,JPO&INPIT
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