| 摘要 |
PROBLEM TO BE SOLVED: To shift to variable valve timing control (phase feedback control) immediately after start even if learning of reference phase (most retarded phase or most advanced phase) has not been completed in a variable valve timing device with an intermediate lock mechanism. SOLUTION: In the variable valve timing device with the intermediate lock mechanism, the reference phase is estimated based on the learning value of the intermediate lock phase, a range in which the target phase can be set is narrowed as compared to a case in which learning of the reference phase has been completed, and camshaft phase is controlled with the target phase set based on the estimated value of the reference phase, when learning of the reference phase (the most retarded phase or the most advanced phase) has not been completed and learning of the intermediate lock phase has been completed. Consequently, the device shifts to the variable valve timing control (phase feedback control) immediately after start even of learning of the reference phase has not been completed. COPYRIGHT: (C)2010,JPO&INPIT
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