Method for controlling a turbocharger with the help of a physical model of the turbocharger's load

摘要

The method involves transforming a pressure set point into a desired load value (Nd), and defining a physical relation between a load of a turbocompressor and a ratio of outlet fluid pressure to inlet fluid pressure of a turbine (TU). A desired turbine pressure ratio is calculated by applying the relation to the load value. A law for controlling actuator e.g. wastegate type valve, of the turbine is estimated from a turbine cartography, fluid rate measurement and pressure ratio. The law is applied to the actuator such that pressure in an intake manifold is equal to the set point pressure.