Electronic fuel injection control system for an internal combustion engine
First Claim
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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Accused Products
Abstract
A fuel injection control system that controls the quantity of injected fuel for an internal combustion engine of the type such as a V-8 engine is disclosed. Such fuel injection control system first calculates a basic amount of fuel to be injected per engine revolution Tp (Tp =Q/N ×Constant Q: intake air flow rate N: engine revolution speed, e.g., rpm), then calculates correction coefficients (COEF, αL and αR) on a basis of other various engine operating parameters (e.g., cooling water temperature) and the air-fuel mixture ratio of each bank of cylinders as sensed by exhaust gas detectors and combines either of their numerical results with the numerical result Tp to obtain a pulse width representing an amount of fuel per revolution Ti, and lastly opens either or both groups of fuel injectors whereby when the intake air flow rate Q is more than a predetermined value Qo, the fuel injectors of both groups are simultaneously opened to inject the fuel during an interval determined by Ti =1/2×Tp ×COEF in synchronism with one half of engine rotation; when Q is less than Qo, the fuel injectors of either group are alternatingly opened to inject the fuel during an interval determined by Ti =Tp ×COEF×(αL or αR).
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Citations
23 Claims
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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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel injection control system for an internal combustion engine having two banks of cylinders, two groups of fuel injectors, each group having fuel injectors equal in number to the cylinders of the corresponding bank, and each fuel injector having a variable open interval, and two exhaust manifolds each provided at the corresponding bank of cylinders, comprising:
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(a) a first sensing means for producing a first signal with a numerical value representing an engine operating parameter, the numerical value of the first signal being a nonlinear function of the engine fuel requirement; (b) a second sensing means for producing a second signal with a numerical value representing another engine operating parameter, the numerical value of the second signal being a nonlinear function of the engine fuel requirement; (c) a first calculating means for arithmetically operating on the numerical values of the first and second signals from said first and second sensing means respectively so as to calculate a basic amount of fuel to be injected per engine revolution from the fuel injectors of each group; (d) A second calculating means for arithmetically operating on numerical values of other sensed signals, the numerical values of the other sensed signals representing various engine operating parameters other than those of the first and second signals so as to calculate correction coefficients to correct the numerical result of said first calculating means and for additively combining correction coefficients according to the fuel requirement with the numerical result from said first calculating means; (e) a means for converting the numerical result from said first calculating means additively combined with the numerical result from said second calculating means into a first pulse signal having a width corresponding to a combination of said numerical results; (f) a means for driving the fuel injectors of each group to open to inject a required amount of fuel to respective cylinders during an interval of time corresponding to the width of the first pulse signal outputted from said pulse converting means; and (g) a means for selectively switching the first pulse signal outputted from said pulse converting means to said driving means according to a numerical result from said second calculating means so as to open either of the two groups of the fuel injectors alternatingly or simultaneously in synchronism with one half of an engine revolution. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification