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METHOD FOR OPERATING A COMBUSTION ENGINE SYSTEM

  • US 20200131981A1
  • Filed: 10/25/2019
  • Published: 04/30/2020
  • Est. Priority Date: 10/26/2018
  • Status: Active Grant
First Claim
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1. A method for operating a combustion engine system, comprising:

  • generating exhaust gas via a combustion engine when in operation,feeding fresh air via a fresh air system to the combustion engine and dissipating exhaust gas via an exhaust gas system from the combustion engine,operating an exhaust gas turbocharger that comprises a compressor wheel incorporated in the fresh air system for compressing the fresh air and a turbine wheel incorporated in the exhaust gas system for driving the compressor wheel,providing an adjustable waste gate valve of the exhaust gas turbocharger, structured and arranged in a bypass position to guide exhaust gas via a bypass channel past the turbine wheel,providing a pollutant conversion system incorporated in the exhaust gas system for reducing pollutants in the exhaust gas, the pollutant conversion system configured such that it has a threshold temperature above which pollutants are reduced,providing a variable turbine geometry of the exhaust gas turbocharger comprising adjustable guide elements surrounding the turbine wheel in a circumferential direction, the guide elements following one another in the circumferential direction and define an overall cross-section in their respective direction position for the exhaust gas to flow through,adjusting the guide elements in a control mode, where the pollutant conversion system comprises a temperature above the threshold temperature, such that the overall cross-section is between a control minimum value and a control maximum value, andoperating in a heat-up mode at temperatures of the pollutant conversion system below the threshold temperature where the guide elements are moved into a heat-up position (34), in which the overall cross-section is smaller than the control minimum value.

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