A rotational combustion engine that generates force from the reciprocal motion and centripetal motion of one or more pistons that is then converted into rotational motion of a first cam and second cam wherein the cams are separated by a 2-3 degree horizontal offset and an angle of 60 degrees as well as camshaft assembly and driving shaft to provide power to an entity such as an automobile.

An engine brake device is disclosed. The engine brake device includes at least one intake camshaft which includes at least one intake cam group having at least one firing cam and at least one braking cam, at least one intake cam follower that is assigned to the firing cam and is provided for actuating at least one intake valve in a firing mode, at least one braking intake cam follower that is assigned to the braking cam and is provided for actuating the at least one intake valve in a braking mode, and a switchover device that is assigned to the intake camshaft and is provided for the purpose of translating a torque of the intake camshaft into a force for switching between the firing mode and the braking mode.

An engine brake device is disclosed. The engine brake device includes at least one intake camshaft which includes at least one intake cam group having at least one firing cam and at least one braking cam, at least one intake cam follower that is assigned to the firing cam and is provided for actuating at least one intake valve in a firing mode, at least one braking intake cam follower that is assigned to the braking cam and is provided for actuating the at least one intake valve in a braking mode, and a switchover device that is assigned to the intake camshaft and is provided for the purpose of translating a torque of the intake camshaft into a force for switching between the firing mode and the braking mode.

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: 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 for operating a drive apparatus, having a reciprocating-piston engine and an exhaust-gas-driven turbocharger, of a motor vehicle, the reciprocating-piston engine being operated in a four-stroke mode during on-load operation; and the exhaust-gas-driven turbocharger having an electrical machine, in particular a media gap machine, that is operated in generator mode during overrun operation of the reciprocating-piston engine. During overrun operation, the reciprocating-piston engine is operated in a two-stroke mode.

A method for operating a drive apparatus, having a reciprocating-piston engine and an exhaust-gas-driven turbocharger, of a motor vehicle, the reciprocating-piston engine being operated in a four-stroke mode during on-load operation; and the exhaust-gas-driven turbocharger having an electrical machine, in particular a media gap machine, that is operated in generator mode during overrun operation of the reciprocating-piston engine. During overrun operation, the reciprocating-piston engine is operated in a two-stroke mode.

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.

Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.