| 摘要 |
An automotive variable valve timing engine arranged to control the quantity of intake air to be supplied to a cylinder by regulating valve timings of an intake valve. An intake air quantity measuring device is provided for measuring the intake air quantity. An intake air quantity estimating system is provided including a control unit which is programmed to carry out (a) judging that a trouble arises in the intake air quantity measuring device, so as to provide a judgment result, and (b) calculating the intake air quantity in accordance with the valve timing of the intake valve, upon providing the judgment result.
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