Back to results
US 4,379,441 AGranted
System for controlling the air-fuel ratio in a combustion engine
AssigneeNissan Motor Co., Ltd.
InventorMakoto Anzai
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNissan Motor Co., Ltd.
InventorMakoto Anzai
Estimating the term…
Improvement is introduced in a conventional feedback control system for supplying an optimal air-fuel mixture to an internal combustion engine on the basis of a sensed component of exhaust gases thereof. The conventional system generally comprises: a sensor, such as an oxygen analyzer, for sensing a component of exhaust gases of the internal combustion engine, the sensor being deposited in an exhaust line generating an electrical signal representative of the sensed component, a differential signal generator being connected to the sensor for generating an electrical signal representative of a differential value between the signal from the sensor and a reference signal, the reference signal being previously determined in due consideration of an optimal supply of an air-fuel mixture to the engine for maximizing the efficiency of a catalytic reactor, a controller including an integrator such as, for example, a p-i (proportional-integral) controller being connected to the differential signal generator, and another controller for generating a control signal connected to the p-i controller, the control signal being fed to an air-fuel regulating means for supplying an optimal air-fuel mixture to the engine, wherein the integrator of the p-i controller is substituted by one or two simple circuits embodying the present invention for simplifying the p-i controller without reducing the efficiency thereof.
In a closed loop mixture control system for an internal combustion engine including exhaust means, means for generating a first signal representative of the deviation of the air-fuel ratio within said exhaust means from a desired air-fuel ratio, an integration circuit for providing integration of said first signal and mixture supplying means responsive to the output of said integration circuit to supply air and fuel in a variable ratio to said engine, wherein said integration circuit comprises:
In a closed loop mixture control system for an internal combustion engine including exhaust means, means for generating a first signal representative of the deviation of the air-fuel ratio within said exhaust means from a desired air-fuel ratio, an integration circuit for providing integration of said first signal and mixture supplying means responsive to the output of said integration circuit to supply air and fuel in a variable ratio to said engine, wherein said integration circuit comprises:
Dependencies are inferred from the claim text.