Method for Regulating Stable Operation of an Exhaust-Gas Turbocharger of an Internal Combustion Engine, and a Corresponding Apparatus

A method for regulating stable operation of an exhaust-gas turbocharger of an internal combustion engine having a fresh-gas supply device, a switchover valve, a control device, a compressor for generating compressed air and an air-processing unit with a discharge valve, comprising the acts of:

• operating the compressor in a suction intake mode in which the switchover valve connects the compressor to an air inlet;
• monitoring operating parameters of the internal combustion engine, the air-processing unit and the exhaust-gas turbocharger when the compressor is in the suction intake mode;
• determining based on the monitored operating parameters whether to switch the switchover valve from the suction intake mode;
• switching the switchover valve to switch over the compressor from the suction intake mode to a pressure-charged mode in which the switchover valve connects the compressor to an exhaust-gas turbocharger compressor;
• and
• monitoring operating parameters of the internal combustion engine, the air-processing unit and the exhaust-gas turbocharger when the compressor is in the pressure-charged mode;
• determining based on the monitored operating parameters whether to switch the switchover valve from the pressure-charged mode;
• switching the switchover valve to switch over the compressor on the basis of the monitored operating parameters from the pressure-charged mode to the suction intake mode.