Patent ID: 7853396

Claim:
A multifuel internal combustion engine which is driven mainly at a theoretical air fuel ratio by introducing at least one of at least two kinds fuel having different properties into a combustion chamber or by introducing mixed fuel including the at least two kinds of fuel into the combustion chamber, the multifuel internal combustion engine comprising: fuel characteristics determining unit that determines ignitability and anti-knocking performance of the fuel introduced into the combustion chamber; combustion mode setting unit that sets a compression hypergolic diffusion combustion mode when ignitability of the fuel introduced into the combustion chamber is excellent, sets a premixed spark-ignition flame propagation combustion mode when the ignitability of the fuel introduced into the combustion chamber is poor and anti-knocking performance is excellent, and sets a spark assist compression hypergolic diffusion combustion mode when both the ignitability and anti-knocking performance of the fuel introduced into the combustion chamber are poor; and combustion control execution unit that makes the engine to drive in a combustion mode which is set by the combustion mode setting unit.