Internal combustion engine and a method for enhancing the yield of an internal combustion engine

An internal combustion engine comprising:

• a power shaft;
• a compressor system for effecting pre-compression and volume reduction of a working gas, thereby to obtain a pre-compressed working gas at a first pressure;
• an engine block positive displacement mechanism having a working chamber partly defined by a piston coupled to the power shaft, and in which the pre-compressed working gas is successively subjected to:
• a heating by combustion near a top dead center of the piston at which the volume of the working chamber is minimal;
• at least an initial part of an expansion-depressurization, while the piston moves towards a bottom dead center;
• a discharge;
• at least one fuel introduction device;
• a heat exchanger which, during warm engine operation at a load level pertaining to a part-load range in which the engine produces driving torque on the power shaft, withdraw heat from the working gas, having been discharged from and travelling downstream of the discharge of the positive displacement mechanism at a second pressure lower than the first pressure, and yielding said heat to the pre-compressed working gas, thereby to cause a temperature of the pre-compressed working gas to be higher at the outlet of the heat exchanger than at an outlet of the compressor system;
• a at least one depollution system;
• and
• a control unit;
• wherein:
• the pre-compressed working gas, heated in the heat exchanger at a first temperature at a hot outlet of the heat exchanger, is subjected, at least in part in the working chamber, to an additional compression with reduction of a specific volume of said working gas and increase of the temperature of the working gas above the first temperature before the heating by combustion,
• at least except in said at least one depollution system, the working gas is in essentially adiabatic conditions between the discharge of the positive displacement mechanism and a hot inlet of the heat exchanger;
• and
• said engine further comprises a thermal adjustment and gas distributor system being connected to said control unit for:
• moderating the temperature of the pre-compressed working gas reaching the positive displacement mechanism by comparison with the temperature of the discharged working gas discharged from the engine block positive displacement mechanism available upstream of the heat exchanger, when the load level exceeds a first threshold within said part-load range;
• and
• cooling down the working gas sent to the positive displacement mechanism, relatively to the temperature of the end of pre-compression, when the load level exceeds a second threshold higher than said first threshold.