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DIGITAL ENGINE CONTROL APPARATUS AND METHOD

  • US 3,835,819 A
  • Filed: 12/29/1972
  • Issued: 09/17/1974
  • Est. Priority Date: 12/29/1972
  • Status: Expired due to Term
First Claim
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1. In a fuel system for an internal combustion engine including a source of fuel for a fuel injection means that is opened to admit a predetermined quantity of fuel to the engine in response to an electrical fuel signal, improved apparatus for controlling the fuel signal comprising:

  • first means for generating a first engine condition digital number having a value representing a first operating characteristic of the engine;

    second means for generating a second engine condition digital number having a value representing a second operating characteristic of the engine;

    data memory means for storing each of a plurality of fuel digital words representing a plurality of discrete engine fuel requirements;

    program memory means for storing a plurality of instruction digital words representing a plurality of operating instructions;

    a program sequencer for initiating the operating instructions in a predetermined order;

    selecting means responsive to the operating instructions for producing a resultant fuel digital word representing the engine fuel requirement by selecting one or more of the fuel digital words depending on the values of the first and second engine condition digital numbers;

    means for storing the resultant fuel digital word;

    means for generating a position signal when the engine is in a predetermined position;

    means responsive to the position signal for producing said fuel signal at the end of a predetermined operating interval; and

    means for altering the value of the fuel signal as a function of the value of the resultant fuel digital word so that the proper quantity of fuel is admitted to the engine through the fuel injector means.

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