The invention relates to a method (100) for operating an internal combustion engine (2), such as an internal combustion engine of a vehicle (1), the engine (2) comprising an engine cylinder (3) at least partly defining a combustion chamber (4) and a reciprocating piston (5), a number of inlet valves (20) in fluid communication with the combustion chamber and a number of exhaust valves (30) in fluid communication with the combustion chamber, wherein any one of the inlet valves and the outlet valves comprises at least one flow control valve. The method comprises the following steps: opening (105) at least one of the inlet valves and introducing the incoming fluid medium into the cylinder (3) of the engine by performing an intake stroke (S1); compressing (110) the trapped incoming fluid medium in a first compression stroke (CS1) of the cylinder (3), while having the number of the inlet valves and the number of the exhaust valves in a closed state; injecting (115) a quantity of fuel into the cylinder (3) and combusting said injected fuel; performing (120) a first work stroke (WS1) to produce power to a crank shaft of the engine, while controlling said flow control valve to partly exhaust burnt gases at the end of the work stroke; additionally compressing (125) remaining fluid medium in an additional compression stroke (CS2) of the cylinder (3), while having the number of the inlet valves and the number of the exhaust valves in a closed state; additionally injecting (130) an additional quantity of fuel into the cylinder (3); additionally performing (135) an additional work stroke (WS2) to produce power to the crank shaft of the engine, while controlling said flow control valve to partly exhaust burnt gases at the end of the additional work stroke; and opening (180) at least one of the exhaust valves and permitting partly burnt gases to expel from the cylinder via said at least one exhaust valve by performing an exhaust stroke (ES).

An internal combustion engine featuring a radial array of cylinders and pistons; the pistons having rods including cam followers engaging the surface of a cam drive to transfer reciprocating linear motion into rotary motion; wherein between the piston rods and the engine housing are disposed arrays of toothed rollers to provide a rolling interface.

The invention relates to a method (100) for operating an internal combustion engine (2), such as an internal combustion engine of a vehicle (1), the engine (2) comprising an engine cylinder (3) at least partly defining a combustion chamber (4) and a reciprocating piston (5), a number of inlet valves (20) in fluid communication with the combustion chamber and a number of exhaust valves (30) in fluid communication with the combustion chamber, wherein any one of the inlet valves and the outlet valves comprises at least one flow control valve. The method comprises the following steps: opening (105) at least one of the inlet valves and introducing the incoming fluid medium into the cylinder (3) of the engine by performing an intake stroke (S1); compressing (110) the trapped incoming fluid medium in a first compression stroke (CS1) of the cylinder (3), while having the number of the inlet valves and the number of the exhaust valves in a closed state; injecting (115) a quantity of fuel into the cylinder (3) and combusting said injected fuel; performing (120) a first work stroke (WS1) to produce power to a crank shaft of the engine, while controlling said flow control valve to partly exhaust burnt gases at the end of the work stroke; additionally compressing (125) remaining fluid medium in an additional compression stroke (CS2) of the cylinder (3), while having the number of the inlet valves and the number of the exhaust valves in a closed state; additionally injecting (130) an additional quantity of fuel into the cylinder (3); additionally performing (135) an additional work stroke (WS2) to produce power to the crank shaft of the engine, while controlling said flow control valve to partly exhaust burnt gases at the end of the additional work stroke; and opening (180) at least one of the exhaust valves and permitting partly burnt gases to expel from the cylinder via said at least one exhaust valve by performing an exhaust stroke (ES).

A method of controlling a reciprocating internal combustion engine comprising: a cylinder defining a cavity having a first end and a second end; and a piston moveable within the cavity of the cylinder between the first end and the second end, the method comprising: controlling injection of a quantity of liquid air, without fuel, into the first end of the cavity at a first time when the piston is closer to the first end than the second end to cause the piston to perform a first power stroke; and controlling injection of fuel into the first end of the cavity at a second time when the piston is closer to the first end than the second end to cause the piston to perform a second power stroke.

A method of controlling a reciprocating internal combustion engine comprising: a cylinder defining a cavity having a first end and a second end; and a piston moveable within the cavity of the cylinder between the first end and the second end, the method comprising: receiving at least a first signal; determining a quantity of liquid air to be injected using at least the received first signal; controlling injection of the determined quantity of liquid air into the first end of the cavity at a first time when the piston is closer to the first end than the second end.

A method of controlling a reciprocating internal combustion engine comprising: a cylinder defining a cavity having a first end and a second end; and a piston moveable within the cavity of the cylinder between the first end and the second end, the method comprising: receiving at least a first signal; determining a quantity of liquid air to be injected using at least the received first signal; controlling injection of the determined quantity of liquid air into the first end of the cavity at a first time when the piston is closer to the first end than the second end.

A method of controlling a reciprocating internal combustion engine comprising: a cylinder defining a cavity having a first end and a second end; and a piston moveable within the cavity of the cylinder between the first end and the second end, the method comprising: controlling injection of a quantity of liquid air, without fuel, into the first end of the cavity at a first time when the piston is closer to the first end than the second end to cause the piston to perform a first power stroke; and controlling injection of fuel into the first end of the cavity at a second time when the piston is closer to the first end than the second end to cause the piston to perform a second power stroke.