| 摘要 |
In an engine such as an engine for driving a pump or dynamo, in which a load increasing state does not appear as an accelerating state of rotation speed, it is intended to prevent the smoke emission in an abruptly load-increasing state, which might otherwise be caused by the suppression or interruption of an EGR quantity. The engine 10 comprises a supercharger 11 and an exhaust gas recirculation (EGR) device 12. The engine 10 makes an isochronous control or a droop control, when its rotation speed N is shifted from a no-load (idle) or light-load run to a high-load (load-increasing) state. In case it is detected, when the state of the engine 10 shifts to a load state, that the actual rotation speed N becomes lower by a predetermined rotation speed &Dgr;N than a target rotation speed Nm, an EGR valve 13 of the exhaust gas recirculation (EGR) device 12 is either throttled to an opening smaller by a predetermined opening &Dgr;F than the ordinary set opening F corresponding to the load state or fully closed.
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