To surely prevent abnormal combustion of a low boiling point fuel and discharge of the low boiling point fuel to atmosphere, the low boiling point fuel being leaked to an inside of a combustion chamber from a fuel injection device 10 during engine stopping in case where the low boiling fuel such as dimethyl ether(DME) or the like is used in a diesel engine 1.
Prior to motoring of an engine of by a starter motor 28 at staring, temperature of an EHC 20 provided to an exhaust passage 3 is controlled to be more than a predetermined value, and then the motoring of the engine is allowed. Until a time after the motoring of the engine has been started by the starter motor 28, fuel supply to the engine is stopped, and an intake throttle means 7 is driven to be closed, thereby scavenging fuel inside an engine combustion chamber. Whether or not scavenging of the engine combustion chamber is terminated is determined, and after determining of the scavenging, the intake throttle valve 7 is driven to be opened, thereby starting the fuel supply to the engine.
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