| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable valve control device which improves exhaust controlling performance, fuel efficiency, and fuel stability of an engine at the same time. SOLUTION: This variable valve control device controls an intake valve closing timing IVC according to an engine operating condition and sets a target residual gas ratio REGR. Effective intake volume VI (cylinder volume at IVC) calculated from IVC is multiplied with the target residual gas ratio REGR so as to calculate target residual gas volume VE (cylinder volume at the exhaust valve closing timing EVC). The target EVC is controlled by calculating from target residual gas volume VE. As a result, residual gas volume (internal EGR volume) is highly accurately controlled so that exhaust controlling performance, fuel efficiency, and fuel stability are improved at the same time.
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