Split Cycle Internal Combustion Engine

The apparatus of any of the previous claims wherein the controller (60) is configured to control delivery of both the first liquid coolant and the second liquid coolant to the compression cylinder.

The apparatus of any of the previous claims wherein the combustion cylinder (20) is further coupled to a third liquid reservoir (80) for providing a source of fuel for a combustion process in the combustion cylinder (20).

The apparatus of any of the previous claims wherein the at least one indication comprises a demand signal, and wherein the controller (60) is configured to control delivery of at least one of the first liquid coolant from the first liquid coolant reservoir (40) and the second liquid coolant from the second liquid coolant reservoir (50) to the compression cylinder (10) based on the demand signal.

The apparatus of any of the previous claims wherein the at least one parameter comprises a temperature in the compression cylinder (10), and wherein the controller (60) is configured to reduce the delivery of the first liquid coolant and the second liquid coolant to the compression cylinder (10) in response to the indication of the temperature in the compression cylinder (10) being below a selected temperature threshold.

The apparatus of any of the previous claims wherein the at least one parameter comprises a pressure in the compression cylinder (10), and wherein the controller (60) is configured to reduce the delivery of the first liquid coolant and the second liquid coolant to the compression cylinder (10) in response to the indication of the pressure in the compression cylinder (10) being below a selected pressure threshold.

The apparatus of any of the previous claims wherein the at least one parameter comprises an oxygen saturation level and wherein the controller (60) is configured to reduce the delivery of the first liquid coolant and the second liquid coolant to the compression cylinder (10) in response to the indication of the oxygen saturation level being below a selected oxygen saturation threshold.

The apparatus of any of the previous claims wherein the compression cylinder (10) comprises an inlet port (8) for the admission of air and wherein the controller (60) is configured to control operation of the inlet port (8) to control the ratio of air to the ratio of the first liquid coolant and/or the second liquid coolant based on the indication of the at least one parameter.

The apparatus of any of the previous claims wherein the compression cylinder (10) comprises an outlet port (9) and the combustion cylinder (20) comprises an inlet port (18) coupled to the outlet port (9) of the compression cylinder (10) via a recuperator (30) for receiving a compressed fluid therefrom, wherein the recuperator (30) is arranged to control the temperature of the compressed fluid delivered to the combustion cylinder (20), and wherein the at least one parameter comprises at least one or a temperature, a pressure or an oxygen concentration of the fluid in the recuperator (30).

The apparatus of any of the previous claims wherein the combustion cylinder (20) is coupled to a third liquid coolant reservoir and wherein the controller (60) is configured to control the delivery of a third liquid coolant to the engine based on the indication of the at least one parameter.

A split cycle internal combustion engine apparatus (100), comprising:

• a combustion cylinder (20) accommodating a combustion piston (22), the combustion cylinder (20) being coupled to a fuel reservoir (80) for providing a source of fuel for a combustion process in the combustion cylinder (20);
• and
• a compression cylinder (10) accommodating a compression piston (12) and being arranged to provide compressed fluid to the combustion cylinder (20), the compression cylinder (10) being arranged to receive a first liquid coolant from a first liquid coolant reservoir (40) and a second liquid coolant from a second liquid coolant reservoir (50), wherein at least one of the first liquid coolant and the second liquid coolant comprises a liquid coolant condensed into a liquid phase via a refrigeration process.