Patent ID: 7156070

Claim:
An internal combustion engine provided with at least one cylinder ( 1 ) and comprising: a fuel injector ( 2 ), through which fuel is injected into a combustion chamber ( 3 ), for each cylinder; a fuel injection control unit ( 4 ) that controls fuel injection quantity per combustion cycle injected through each fuel injector; a piston ( 5 ) in the engine cylinder whose compression action causes a mixture of air and fuel within the combustion chamber to be ignited; at least one inlet valve ( 6 ) for admitting gas which includes fresh air into said cylinder; at least one exhaust valve ( 7 ) for exhausting combusted gases from said cylinder; at least one sensor for measuring an engine operation parameter; wherein during compression ignition mode, the exhaust valve is arranged to be closed before top dead center during an exhaust stroke of the piston and the intake valve is arranged to be opened after top dead center during an induction stroke of the piston, in order to retain residual exhaust gas, and the fuel injection control unit is arranged to control the fuel injection quantity so as to perform a first fuel injection before top dead center of the piston exhaust stroke and to perform at least one further fuel injection in the interval after top dead center of the piston stroke and before top dead center of a subsequent piston compression stroke.