Verfahren zum Steuern eines Turboladers

摘要

In a method and a system for preventing a reverse gas mass flow through a compressor of a turbo charged combustion engine, the maximum allowed pressure drop over the compressor for each gas mass flow is mapped in a pressure difference gas mass flow map stored in the control system of the engine. When the readings of current pressure difference and current gas mass flow indicates that engine operation is close to a value pair resulting in a reverse gas mass flow through the compressor, the control unit, in particular the electronic control unit (ECU), controlling the engine controls the turbine speed of the turbo charger to a reduced speed resulting in a lower pressure difference over the compressor thereby avoiding a reverse gas mass flow through the compressor of the turbo charger. Because the pressure difference can be derived from the turbine speed it is possible to directly control the turbine speed using the current gas mass flow as input signal in addition to the turbine speed signal.