Internal combustion engine

A combustion engine, having an exhaust valve and a valve for the new gas coming to the cylinder (scavenging valve), each cylinder produces work at each rotation of the crank shaft, the compressor part is differentiated from the work part, after the compressor part the gas goes to the gas exchange ducts, the fuel ignites or shall be ignited (glow plug, injection of the assistant fuel, spark and so on), the exhaust gases exit through the exhaust valve,

• characterized in that the scavenging gas has a high pressure (for example 20 bar), the temperature of the compressed gas can be controlled (for example lower when needed), the exhaust gas exit through the exhaust valve during about 180° crank angle, the gas exchange occurs during a small crank angle, close to the top dead centre of the piston (measured in distance), before it, as the pictures 4 and 5 shows, in other word, the gas exchange has occurred before the piston has reached its top dead centre, then the secondary compression, the self ignition of the mixture, and or the ignition and then the expansion. The size of the combustion chamber is adjustable, when needed. The fuel shall be injected to the hot compressed air.