Engine brake method for operating a vehicle with a turbocharged internal combustion engine and associated vehicle

An engine brake method for operating a vehicle with a turbocharged internal combustion engine, wherein:

• the engine comprises:
• several cylinders, which are connected to an intake manifold, collecting fresh air, and to an exhaust manifold, collecting exhaust air from the cylinders;
• a turbocharger, with a compressor driven by a turbine, the compressor being configured to increase a boost pressure of the fresh air in the intake manifold, while the turbine is configured to be driven by the exhaust air flowing from the exhaust manifold;
• a boost pressure regulation device, which is configured to adjust the boost pressure in the intake manifold;
• and
• an exhaust gas restriction device, which is located downstream from the turbine and which is configured to regulate an air exhaust pressure in the exhaust manifold,
• the engine brake method comprises a dual phase during which, simultaneously:
• the boost pressure regulation device regulates the air exhaust pressure in the exhaust manifold in closed loop, in order to regulate the exhaust pressure to a pre-determined first threshold, and
• the exhaust gas restriction device controls the boost pressure in closed loop, in order to regulate the boost pressure to a pre-determined second threshold.