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Electronic fuel injection control system for an internal combustion engine

  • US 4,383,515 A
  • Filed: 03/16/1981
  • Issued: 05/17/1983
  • Est. Priority Date: 03/18/1980
  • Status: Expired due to Term
First Claim
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1. A fuel injection control system for an internal combustion engine having two banks of cylinders, a fuel injector located at an intake of each cylinder, and an exhaust manifold for each bank of cylinders having a catalytic converter positioned therein, said system comprising:

  • (a) a first circuit for calculating a pulse width representing an amount of fuel to be injected into the engine in synchronism with engine speed on a basis of two input signals, one signal representing an intake air flow rate and the other signal representing the instantaneous engine revolution speed, and for producing a signal corresponding to one of tri-state logic signals depending upon whether the intake air flow rate exceeds a predetermined value to thereby enable the fuel injectors of both banks of engine cylinders to be simultaneously actuated or for the fuel injectors of either bank of cylinders to be alternatingly actuated;

    (b) a second circuit for converting the calculated result from said first circuit into an actual pulse of a corresponding width;

    (c) a driving circuit for operating the fuel injectors of both banks of cylinders simultaneously or for operating the fuel injectors of each bank of cylinders alternatingly during an interval of time corresponding to the pulse width of the pulse signal from said second circuit depending on the state of said tristate logic signals from said first circuit; and

    (d) a third circuit for actuating said driving circuit according to the level of the tri-state logic signal fed from said first circuit.

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