In an engine having an intake device provided with a solenoid valve, an amount of intake air is controlled on a basis of a duty control by means of a control unit, and the control unit includes an element for recognizing a state which is evidently different from a normal state to thereby stationarily hold a duty of the solenoid valve at a necessary set value.

En un motor que tiene un dispositivo del producto proporcionado una válvula de solenoide, una cantidad de aire de producto es controlada sobre una base de un control del deber por medio de una unidad de control, y la unidad de control incluye un elemento para reconocer un estado que sea evidentemente diferente de un estado normal de tal modo stationarily celebrar un deber de la válvula de solenoide en un valor necesario del sistema.

 
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