3 to be sucked into the combustion chamber of the 1st cylinder the other cylinders will be also subjected to similar series of operations for example in case of the 5th cylinder corresponding to the diagram c the fuel injected at a 2 and a 3 is sucked in at the period j 5 for which the suction valve of the 5th cylinder is opened in case of the 3rd cylinder corresponding to the diagram d a part of the fuel injected at a 2 the fuel injected at a 3 and a part of the fuel injected at a 4 are sucked in together while the suction valve is open for the period j 3 the part of the fuel injected at a 2 plus the part of the fuel injected at a 4 equals a quantity of fuel injected by a fuel injector at a single actuation therefore also during the suction step of the 3rd cylinder the quantity of fuel equal to the total quantities supplied through doubleactuations of the fuel injector will be sucked in also in case of the 6th 2nd or 4th cylinder as shown in the diagram e f or g the double quantity of fuel is sucked in during a single step of suction as apparentfrom the above description the quantity of fuel determined by the fuel injection signal.