Control method for a turbocharger supercharged internal combustion engine

1) A control method of an internal combustion engine (1) supercharged by means of a turbocharger (12) provided with a turbine (13) and with a compressor (14);

• the control method comprises the steps of:
• establishing at least one operating limit curve (29;
• 30) on a Reduced Mass Flow Rate/Compression Ratio map;
• establishing at least one intervention curve (31;
• 32) of a wastegate valve (16) which adjusts a bypass pipe (15) of the turbine (13) on a Reduced Mass Flow Rate/Compression Ratio map;
• establishing at least one intervention curve (33;
• 34) of a Poff valve (19) which adjusts a bypass pipe (18) of the compressor (14) on a Reduced Mass Flow Rate/Compression Ratio map;
• using the operating limit curve (29;
• 30) to limit the pressure target downstream of the compressor (14) used by the engine control;
• controlling the opening of the wastegate valve (16) if the intervention curve (31;
• 32) of the wastegate valve (16) is exceeded;
• and
• controlling the opening of the Poff valve (19) if the intervention curve (33;
• 34) of the Poff valve (19) is exceeded.