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Air-fuel ratio feedback control system

  • US 4,176,626 A
  • Filed: 07/05/1977
  • Issued: 12/04/1979
  • Est. Priority Date: 07/03/1976
  • Status: Expired due to Term
First Claim
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1. In combination with a fuel supply system for an internal combustion engine, said fuel supply system controlling the amount of air-fuel mixture to be supplied to an engine in accordance with preset air-fuel ratio characteristics of the fuel supply system, and an air-fuel ratio sensing means for sensing the oxygen concentration of the exhaust gas of an engine and generating an output signal corresponding to the air-fuel ratio of the air-fuel mixture supplied by the fuel supply system, the improvement comprising:

  • (a) a feedback control circuit connected to the fuel supply system and to the air-fuel ratio sensing means, said feedback control circuit including means for integrating the output signal of the air-fuel ratio sensing means and applying an integrated signal to the fuel supply system;

    (b) a disabling circuit connected to the feedback control circuit for disconnecting the feedback control circuit from the fuel supply system when engine speed is above a predetermined value; and

    (c) a fuel increment signal generating circuit connected to the fuel supply system and the disabling circuit for generating and applying a compensating signal to the fuel supply system corresponding to engine speed in order to increase the fuel quantity supplied by the fuel supply system when the feedback control circuit is disconnected from the fuel supply system.

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