Volvo Truck Corporation

Marcus Olsén

Björn Lundstedt

Johan Larsson

A turbocharger system () of a combustion engine () comprises a turbocharger turbine () operable by exhaust gases, a valve () configured to control gas flow of pressurized gas from a pressurized gas reservoir () to the turbocharger turbine (), and a sensor (). Turbocharger system operation comprises injecting a test pulse of pressurized gas from the pressurized gas reservoir () to drive the turbocharger turbine () by means of controlling the valve (), detecting an impact of injected pressurized gas on the turbocharger turbine () by means of the sensor (), collecting data from the sensor (), and diagnosing the turbocharger system () by evaluating an operational response of the turbocharger turbine () as a result of the injected test pulse of pressurized gas, based on the collected data.

On-board diagnostics of a turbocharger system

The invention relates to a method for controlling a turbocharger system () fluidly connected to an exhaust manifold () of a combustion engine (). The turbocharger system () comprises a turbocharger turbine () operable by exhaust gases from said exhaust manifold, and a tank () with pressurized gas, said tank being fluidly connectable to said turbocharger turbine. The method comprises the steps of: determining an engine operational mode in which the combustion engine runs below a predetermined speed, determining an external load requiring engine torque which at said engine operational mode would cause the combustion engine to stall, and subsequently injecting pressurized gas from said tank to drive said turbocharger turbine such that the turbocharger turbine is at least partly driven by said pressurized gas, thereby preventing stalling of the combustion engine.

Method for controlling a turbocharger system for a combustion engine and a turbocharger system for use together with a combustion engine

A method for controlling a turbocharger system fluidly connected to an exhaust manifold of a combustion engine and an exhaust after treatment system. The turbocharger system comprises a turbocharger turbine operable by exhaust gases from the exhaust manifold, and a tank with pressurized gas, the tank being fluidly connectable to the turbocharger turbine. The method comprises the steps of: determining a NOx parameter being indicative of, or correlated to, NOx emissions from the exhaust after treatment system; and injecting pressurized gas from the tank to drive the turbocharger turbine based on the determined NOx parameter, wherein a determined NOx parameter above a pre-defined first threshold determines that pressurized gas from the tank is injected.

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Kungsbacka, Sweden

Marcus Olsén