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Apparatus for metering an air-fuel mixture to an internal combustion engine

  • US 4,674,459 A
  • Filed: 01/30/1985
  • Issued: 06/23/1987
  • Est. Priority Date: 02/01/1984
  • Status: Expired due to Fees
First Claim
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1. Apparatus for metering an air-fuel mixture to an internal combustion engine, the apparatus comprising:

  • characteristic field means made up of operating quantities of said engine for anticipatorily controlling engine variables that influence the air-fuel mixture;

    a control arrangement responsive to at least one of the operating quantities for correctively influencing the characteristic field values, the control arrangement including;

    means for addressing characteristic field values stored in said characteristic field in dependence upon operating quantities of said engine; and

    ,control means for changing said characteristic field values to correctively influence the latter, said control means being a control directed to a minimal specific consumption of fuel (bemin -control) in the lower and part-load range and being a control directed to maximum power (Pmax -control) in the upper load range, said control means being configured so as to operate pursuant to an extreme-value control;

    one of said engine variables controlled by said characteristic field means being a fuel metering signal, said control means including a test signal generator for generating a test signal superposed on said fuel metering signal for controlling to maximum power (Pmax -control); and

    , measuring means for analyzing the reaction of the engine to said test signal; and

    speed sensor means for providing a speed signal indicative of the rotational speed of the engine, said measuring means receiving said speed signal for analyzing said reaction of the engine based on changes in said speed signal; and

    , said measuring means including a digital bandpass for use in analyzing said reaction.

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