| 摘要 |
PROBLEM TO BE SOLVED: To improve transient performance of an engine. SOLUTION: In an engine having electromagnetically driven intake and exhaust valve, the fundamental value IVCo of the closing timing of the intake valve is calculated according to a target air amount QA (S1-S3). After the closing timing EVC of the exhaust valve, the opening timing IVO of the intake valve, and the opening timing EVO of the exhaust valve are calculated, limit treatment is effected onΔEVC,ΔIVO, andΔEVO byΔmax (S4 and S5), and after the IVC is corrected by an internal part EGR amount and set, IVO, IVC, EVO, and EVC are controlled. This constitution decreases the change speed of a valve timing except an intake valve closing timing to a value lower than the change speed of an intake valve closing timing and improves torque performance at a transient time.
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