A process relating to a two-stroke cycle internal combustion engine to control the pressure and/or the temperature of the gaseous blend inside the combustion chamber at the time of ignition of combustion, while the air/fuel mixture is maintained close to the stoichiometric ratio. The process is mainly based on high compression by an auxiliary compressor of air that is accumulated in a reservoir. The compressed air is typically injected at two different temperatures, one being relatively cold and the other being relatively hot, as heated by the heat energy recovered from exhaust gases or heaters. The intake compressed air is carried out with predetermined quantity from both temperatures as an injection into the cylinder which already contains a predetermined quantity of the burnt gases from the previous combustion cycle.

A process relating to a two-stroke cycle internal combustion engine to control the pressure and/or the temperature of the gaseous blend inside the combustion chamber at the time of ignition of combustion, while the air/fuel mixture is maintained close to the stoichiometric ratio. The process is mainly based on high compression by an auxiliary compressor of air that is accumulated in a reservoir. The compressed air is typically injected at two different temperatures, one being relatively cold and the other being relatively hot, as heated by the heat energy recovered from exhaust gases or heaters. The intake compressed air is carried out with predetermined quantity from both temperatures as an injection into the cylinder which already contains a predetermined quantity of the burnt gases from the previous combustion cycle.