Abstract: The invention relates to a method for regulating or controlling the compressor (2) of an exhaust gas turbocharger (3) of an internal combustion engine (4), having the following method steps: measuring an ambient air pressure (PU); measuring a static pressure (PV) upstream of the engine inlet; measuring the rotational speed (U) of the exhaust gas turbocharger (3); determining a static pressure (PE) which is present directly at the compressor inlet (11) by calculating a vacuum (Pdyn) in the compressor inlet line (11) and subtracting the calculated vacuum (Pdyn) from the measured ambient air pressure (PU); determining a static pressure (PA) which is present directly at the compressor outlet (12) by calculating the pressure loss (PDV) in the compressor outlet line (18) and adding the calculated pressure loss (PDV-) to the measured static pressure (PV); and regulating or controlling the compressor operation corresponding to at least one of the determined pressure values (PE or PA) and the rotational speed signal (

Abstract: The invention relates to a turbocharger (1) comprising a compressor (2) provided with a housing (3), an overrun air valve (4) provided with a valve housing (6) which is fixed to the compressor housing (3), and a boost pressure regulating valve (5). Said turbocharger is characterised in that the boost pressure regulating valve (5) is fixed to the valve housing (6) and connected in a pressurised manner to an internal pressure chamber (7) of the overrun air valve (4).

Abstract: The invention relates to a turbocharger (1) comprising a turbine (2) and a compressor (3), connected to the turbine (2) so as to drive it and having a compressor housing (5) which has a by-pass channel (9) for connecting the compressor outlet with the compressor inlet and a diverter valve (10) which comprises a sealing element (11) having an obturator (12) and a valve face (13), the obturator (12) having a sealing lip (14).