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Procedure and device for determining the composition of a fuel mixture

  • US 8,032,294 B2
  • Filed: 05/07/2009
  • Issued: 10/04/2011
  • Est. Priority Date: 05/08/2008
  • Status: Expired due to Fees
First Claim
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1. A method of determining a composition of a fuel mixture consisting of a first fuel and at least a second fuel for operating a self-igniting combustion engine with at least one sensor that is determining a course of combustion in at least one cylinder of the combustion engine, the method comprising:

  • creating a measure for stability of the combustion process from a parameter that characterizes a combustion process in at least one cylinder of the combustion engine, wherein the determination of the composition of the fuel mixture takes place from the measure for the stability of the combustion process;

    adjusting operating parameters of the combustion engines such that the measure for the stability of the combustion process does not exceed a predefined threshold value for the stability of the combustion process; and

    providing one or more of the following for complying with the predefined threshold value;

    an increase of a remaining gas mass in the at least one cylinder of the combustion engine;

    an early shifting of a nominal value of a regulation of a combustion focus position; and

    an introduction of a pre-injection of fuel.

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