| 摘要 |
PROBLEM TO BE SOLVED: To provide a vane type valve-timing control device to control the valve timing by the sliding mode control, where mixing in of air into a hydraulic chamber is presumed to serve for air bleeding. SOLUTION: A changeover function S (S=γ×(PERR)+d(PERR)/dt) is calculated from a deviation PERR and an inclinationγ, and using the obtained changeover function, a nonlinear term operating amount UNL=-kS/(|S|+δ) is calculated from a nonlinear term gain (k) and chattering preventing factorδ. When the variation frequency of UNL is higher than the reference frequency, inclusion of air in the hydraulic chamber is presumed (S2). If it is a yes, air bleeding is conducted upon executing a control to the most retarded angle, if operation is in the low rotation and low load region (S6) and it is set to the most advanced angle, if it is in high rotation and high load region (S5).
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