Internal combustion engine and method of operating such engine

An internal combustion engine comprising:

• a pair of first and second cylinders configured to operate on a split-cycle principle, the first cylinder being configured to run intake and compression strokes, the second cylinder of the pair being configured to run power and exhaust strokes;
• a passage fluidly connecting the first and second cylinders and configured to enable transfer of a flow of pressurized fluid between the first and second cylinders;
• a cooling arrangement associated with the passage, the cooling arrangement operating to cool the flow of pressurized fluid;
• a valve arrangement to control the flow of the pressurized fluid into the second cylinder over a first period of time;
• a fuel injection arrangement configured to inject fuel into the second cylinder over a second period of time, the fuel injection arrangement being configured to inject the fuel into the flow of pressurized fluid upstream of the valve arrangement;
• and
• a control arrangement configured to control at least the fuel injection arrangement such that the first and second time periods at least partially overlap, wherein, during an overlap of the first and second time periods, an inlet valve of the valve arrangement is open so that a mixture of the flow of pressurized fluid and the fuel enter the second cylinder.

A method of operating a combustion engine comprising:

• causing an intake stroke in a first cylinder;
• causing a compression stroke in the first cylinder thereby creating pressurized fluid;
• releasing the pressurized fluid from the first cylinder;
• cooling the pressurized fluid that is released from the first cylinder to form a cooled fluid;
• directing the cooled fluid into a second cylinder;
• injecting fuel into the second cylinder for combustion with the cooled fluid, wherein the fuel is injected upstream of the second cylinder only while an inlet valve to the second cylinder, through which the cooled fluid enters the second cylinder, is open so that a mixture of the cooled fluid and the fuel enter the second cylinder.

A method of operating a combustion engine comprising:

• causing an intake stroke in a first cylinder;
• causing a compression stroke in the first cylinder thereby creating pressurized fluid;
• releasing the pressurized fluid from the first cylinder;
• flowing the pressurized fluid into a second cylinder during a first period of time;
• injecting fuel into the second cylinder during a second period of time wherein the first period of time and the second period of time at least partially overlap and wherein the fuel is injected into the pressurized fluid while the pressurized fluid is flowing upstream of the second cylinder in a direction generally towards a piston in the second cylinder only while an inlet valve, through which the cooled fluid enters the second cylinder, is open so that a mixture of the cooled fluid and the fuel enter the second cylinder.