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Control system for internal combustion engines

  • US 5,245,978 A
  • Filed: 08/20/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 08/20/1992
  • Status: Expired due to Term
First Claim
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1. A control system for controlling a mixture of air, fuel and fuel vapor inducted into an internal combustion engine having a fuel vapor recovery system coupled between a fuel system and an air/fuel intake of the engine, comprising:

  • feedback control means coupled to an exhaust gas oxygen sensor for controlling the fuel inducted into the engine to achieve a stoichiometric mixture of inducted air, fuel, and fuel vapors;

    said feedback means including learning means for learning mass flow rate of the inducted fuel vapors and correcting the inducted fuel in response to said learned vapor flow; and

    inhibiting means for providing a prediction of a rich offset from said stoichiometric mixture and for inhibiting said learning by said learning means in response to said prediction.

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