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Exhaust gas control in an engine having a two-stage turbocharger

  • US 6,801,846 B1
  • Filed: 10/24/2003
  • Issued: 10/05/2004
  • Est. Priority Date: 10/24/2003
  • Status: Expired due to Term
First Claim
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1. An internal combustion engine comprising:

  • combustion chambers within which fuel is combusted;

    an exhaust system through which exhaust flow containing products of combustion is conveyed from the engine, including first and second turbines of a multi-stage turbocharger and a valve for selectively by-passing the exhaust flow around one of the turbines; and

    a control system comprising a processor for processing data to develop data for controlling the extent to which the valve selectively by-passes the exhaust flow around the one turbine, wherein the processor comprises a control strategy a) for processing data values of various parameters to develop a data value representing a desired set-point of operation for the valve corresponding to a desired exhaust by-pass flow around the one turbine, b) for processing the desired set-point data value and a data value correlated with the actual set-point of operation of the valve to develop a set-point error data value for closed-loop control of the actual set-point, c) for selecting a data value of closed-loop gain from a schedule based on a data value of a parameter that characterizes an aspect of engine operation, d) for processing both the selected data value of closed-loop gain and the set-point error data value to create a data value for a closed-loop output, and e) for using the data value for the closed-loop output to create a data value for a final output for forcing the actual set-point to the desired set-point.

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