Patent ID: 8113186

Claim:
A multifuel internal combustion engine in which single low boiling point component fuel and at least one kind of fuel having properties different from those of the single low boiling point component fuel are introduced into a combustion chamber separately or together thereby operating the multifuel internal combustion engine, comprising: lubricant-oil temperature detecting unit that detects a temperature of lubricant oil, or lubricant-oil temperature estimating unit that estimates the temperature; and purge control unit that prohibits purge control by an evaporation gas purge apparatus or reduces a purge flow rate of evaporation gas in the purge control, when the detected or estimated temperature of the lubricant oil is near a boiling point temperature of the single low boiling point component fuel at which it is necessary to reduce a fuel injection amount from a fuel injection valve to a predetermined amount or less to adjust an air/fuel ratio of the combustion chamber to a target air/fuel ratio.