UNIT FOR ESTIMATING THE ROTATIONAL SPEED OF A TURBOCHARGER AND SYSTEM AND METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE WITH A TURBOCHARGER

摘要

A unit for estimating a rotational speed of a turbocharger is provided. The unit includes a microprocessor comprising input ports configured for receiving measurement signals from an exhaust gas flow control system of an internal combustion engine and an output port for outputting a signal indicative of the rotational speed of the turbocharger. The input ports are adapted to receive a first set of measurement signals and a second set of measurement signals. A microprocessor is configured to calculate an estimated rotational speed of the turbocharger using a turbocharger model, based on the first set of measurement signals and the second set of measurement signals. The second set of measurement signals include signals indicative of a pressure difference across a turbine of the turbocharger.