US 4,089,313 AGranted

Closed-loop air-fuel mixture control apparatus for internal combustion engines with means for minimizing voltage swing during transient engine operating conditions

AssigneeNissan Motor Co., Ltd.

InventorsMasaharu Asano, Nobuzi Manaka

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Abstract

Apparatus for controlling air-fuel mixture applied to internal combustion engines comprises an exhaust composition sensor providing an electrical signal representative of the concentration of a composition of the exhaust gases, an integral controller receptive of the electrical signal to generate a correction signal for the air-fuel mixing and proportioning device to control the air-fuel ratio at a desired value. An engine condition sensor is provided to detect transient engine operating conditions to generate a control signal which is used to maintain the output voltage of the integral controller at a predetermined constant value so that the voltage swing during vehicle acceleration or deceleration is held within a minimum range.

Claims7

Dependent claims

Fuel control apparatus for an internal combustion engine including sensing means for sensing the concentration of a component within a composition of exhaust gases from an internal combustion engine and providing an electrical signal representative of the sensed concentration;

air-fuel supplying means for supplying air and fuel to the engine in a variable ratio;
an integral controller connected to the exhaust composition sensing means to process the electrical signal and apply a feedback signal to the air-fuel supplying means to effect a minimum amount of noxious components in the exhaust gases from the engine;
means for sensing transient operating conditions of the engine;
and
switching means responsive to the sensed operating conditions of the engine for disconnecting passage of said electrical signal to the integral controller and connecting a predetermined DC voltage to said air-fuel supplying means.

2 more elements

Dependencies are inferred from the claim text.