To solve a problem that a distance between a spark discharging portion of an ignition plug and a plug of fuel injection varies if viscosity of fuel varies, leading to degradation in combustion conditions.
A spark ignition internal combustion engine 1 includes a fuel pressure sensor 3 for detecting the viscosity of fuel supplied to a fuel injection valve 4, and detects the viscosity of fuel based on a variation in a fuel pressure during operation of the fuel injection valve 4. In a case of stratified combustion by a spray guided injection, an ECU 5 advances fuel injection start timing of the fuel injection valve 4 according to a rise in the detected viscosity of the fuel. Thus, even if the viscosity of the fuel is significantly high (in case alcohol-containing gasoline is used, or a fuel temperature is low in a very cold place, for example), air-fuel mixture formation in the vicinity of the spark discharging portion 2a at the ignition timing can well take place so that a good combustion condition can be maintained even if the viscosity of the fuel increases.
HAYASHI TOMOHIRO
MIZOBUCHI TAKASHI
DENSO CORP
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Shinji Hase