| 摘要 |
An electronic control unit 10 of an internal combustion engine sets a target throttle valve opening degree based on the amount of accelerator pedal operation, and starts driving an electronically controlled throttle valve 16 after a predetermined delay time has passed in order to precisely estimate the actual throttle valve opening degree when the intake valve of the cylinder is closed and to estimate the amount of the intake air filled in the cylinder. In an engine equipped with a variable valve timing mechanism 50, the ECU 10 estimates the target throttle valve opening degree of when the intake valve closes, estimates the actual valve timing when the intake valve closes based on the estimated target opening degree, and estimates the amount of the air filled in the cylinder when the intake valve of the cylinder closes based on the estimated throttle valve opening degree and on the estimated valve timing. The amount of the air taken in is thus precisely estimated even in a variable valve timing engine.
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