| 摘要 |
PROBLEM TO BE SOLVED: To compatibly materialize characteristics attaching importance on fuel economy and characteristics attaching importance to torque response as setting of valve lift characteristics and to prevent torque variation at a time of change over of the characteristics. SOLUTION: This device is provided with a first variable valve system capable of continuously varying operation angle VEL of an intake valve and a second variable valve system capable of continuously varying center angle VTC, and controls intake air quantity by lift characteristics of the intake valve materialized by that. The device includes a mode attaching importance to fuel economy and a mode attaching response as setting of target operating angle and target center angle in relation to target torque, and changes the mode over according to an operation condition. The target operating angle gradually changes with change speed limited during change over and the target center angle is calculated based on actual operating angle, demand torque and engine speed. Consequently, torque variation accompanying change over is reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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