Split cycle internal combustion engine

A split cycle internal combustion engine comprising:

• a combustion cylinder accommodating a combustion piston;
• a compression cylinder accommodating a compression piston and being arranged to provide compressed fluid to the combustion cylinder;
• wherein
• the compression cylinder comprises a liquid coolant inlet, wherein the liquid coolant inlet is in fluid communication with a liquid coolant reservoir via a liquid coolant flow path, wherein the liquid coolant reservoir comprises a driver arranged to create a pressure differential in the liquid coolant reservoir to drive a portion of the liquid coolant towards the compression cylinder, wherein the driver comprises a heater arranged to heat a portion of the liquid coolant reservoir in response to a control signal from a controller to create a pressure differential in the liquid coolant reservoir to drive a portion of the liquid coolant towards the compression cylinder.

A filter apparatus for use in a split cycle internal combustion engine for removing solid contaminants from a liquid, wherein the liquid is condensed into a liquid phase via a refrigeration process, wherein the filter apparatus comprises:

• a liquid inlet;
• a liquid outlet, wherein the liquid inlet is coupled to the liquid outlet via a filtering element, the filtering element comprising a first portion and a second portion;
• and
• a diverter arranged to direct liquid through the first portion of the filtering element and, in response to a control signal, direct liquid through the second portion of the filtering element;
• wherein the first and second portions of the filtering element are each configured to filter a liquid coolant which has been condensed into its liquid phase via a refrigeration process;
• and
• wherein the filter apparatus is configured to heat a respective one of the first and second portions of the filtering element while liquid coolant is directed through the other one of the first and second portions of the filter.