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Fuel demand engine control system

  • US 4,138,979 A
  • Filed: 09/29/1977
  • Issued: 02/13/1979
  • Est. Priority Date: 09/29/1977
  • Status: Expired due to Term
First Claim
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1. A closed loop system for controlling the air-fuel mixture in an internal combustion engine comprising:

  • accelerator means for supplying a quantity of fuel to said internal combustion engine;

    means responsive to said accelerator means for generating a first signal indicative of said quantity of supplied fuel;

    means for controlling the flow of air into said internal combustion engine;

    means responsive to said air flow control means for generating a second signal indicative of the actual air flow into said engine;

    control signal-computing means responsive to at least said first and second signals for generating a basic control signal for regulating said air flow control means, said basic control signal commanding a desired air flow as a function of the quantity of fuel supplied to the engine;

    means responsive to the actual air-fuel mixture existing in said engine for generating a feed-back signal indicative thereof; and

    means responsive to said feed-back signal for correcting said basic control signal, said air flow control means being responsive to said corrected control signal for selectively increasing and decreasing the air flow into said engine to maintain a desired optimal air-fuel ratio under substantially all engine operating conditions.

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