FIELD: fuel.
SUBSTANCE: invention relates to internal combustion engine fuel type or properties determining device. Disclosed is internal combustion engine fuel properties determining device, equipped with ignition plug and ignition advance controller. Electronic control unit, located in fuel properties determining device, performs process of determining, performing determining properties of fuel supplied to internal combustion engine based on ignition sufficiency coefficient during preset time interval after internal combustion engine starting. Electronic control unit is made with possibility to determine that, fuel is heavy when determining index value produced by ignition sufficiency coefficient processing in procedure of smoothing, is equal to or exceeds specified threshold value. Electronic control unit is made with possibility to establish smoothing coefficient equal to value, corresponding to its value for each of periods: first period, second period and third period.
EFFECT: technical result is more accurate determination even at low temperatures, if fuel, supplied to internal combustion engine, is heavy fuel.
5 cl, 7 dwg
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