Multiple cylinder engine

An internal combustion engine comprising:

• a first piston reciprocatingly disposed in a first cylinder;
• a combustion chamber fluidly coupled with the first cylinder;
• an ignition source at least partially disposed within the combustion chamber;
• an intake valve providing selective fluid communication between an intake system and the combustion chamber;
• an exhaust valve providing selective fluid communication between an exhaust system and the combustion chamber;
• a second piston reciprocatingly disposed within a second cylinder, wherein reciprocating movement of the second piston draws air into the second cylinder via a fluid inlet and expels the air from the second cylinder via a fluid outlet;
• a pressure accumulator fluidly coupled with the fluid outlet of the second cylinder configured to provide a reservoir of pressurized air;
• a crankshaft coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of the first piston and the second piston;
• and
• a turbine fluidly coupled with an outlet of the pressure accumulator for selectively receiving pressurized air from the pressure tank and rotationally driving the crankshaft.

An internal combustion engine comprising:

• a first piston reciprocatingly disposed in a first cylinder;
• a combustion chamber fluidly coupled with the first cylinder;
• an ignition source at least partially disposed within the combustion chamber;
• an intake valve providing selective fluid communication between an intake system and the combustion chamber;
• an exhaust valve providing selective fluid communication between an exhaust system and the combustion chamber;
• a second piston reciprocatingly disposed within a second cylinder, wherein reciprocating movement of the second piston draws a fluid into the second cylinder via a fluid inlet and expels the fluid from the second cylinder via a fluid outlet;
• a pressure tank fluidly coupled with the fluid outlet of the second cylinder configured to provide a reservoir of pressurized fluid, the pressure tank including a compliant member between the reservoir of pressurized fluid and a volume of compressible fluid;
• a crankshaft coupled with the first piston and the second piston for rotational motion associated with reciprocating movement of the first piston and the second piston;
• and
• a hydraulic motor fluidly coupled with an outlet of the pressure tank for selectively receiving pressurized fluid from the pressure tank and rotationally driving the crankshaft.