| 摘要 |
PURPOSE:To prevent a rapid increase in engine speed even when an auxiliary air quantity is excessive because of abnormality of a control valve or the like, by conducting fuel cut, when the engine speed is within a predetermined range and an intake manifold pressure is a predetermined pressure or more. CONSTITUTION:When a throttle valve 32 is in a substantially full closed position, and an engine speed is a predetermined speed or more, an electronic control device 40 generates to output a fuel cut signal to cut a current flowing through a solenoid of an injection nozzle 34, thereby stopping the supply of fuel. Also when an intake manifold pressure to be detected by a pressure sensor 41 is a predetermined valur or more, and the engine speed is within a predetermined range, the fuel cut is conducted. Accordingly, even when the fuel cut is canceled, and an auxiliary air quantity passing through a bypass passage 31 becomes excessive because of abnormality or the like of a control valve 30, the fuel cut can be conducted again, provided that the engine speed is within the predetermined range.
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