Air-fuel ratio control apparatus of internal combustion engine

Details Air-fuel ratio control apparatus of internal combustion engine Air-fuel ratio control apparatus of internal combustion engine

1993-12-16

1995-03-28

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 5100

Patent

active

054007615

ABSTRACT:
An air-fuel ratio control apparatus of an internal combustion engine capable of learning and controlling an air-fuel ratio accurately both in idling and non-idling without being affected by concentration of evaporated fuel. Uniform deviation of an air-fuel ratio is detected before starting purging of the evaporated fuel (steps S133 to S137), air-fuel ratio learning values KGI.sub.0 to KGI.sub.7 and KGS.sub.0 to KGS.sub.7 are stored respectively so that the uniform deviation shows a predetermined value or lower both at idling time and at non-idling time (steps S138 to S142), and air-fuel learning values KG.sub.0 to KG.sub.7 in respective areas including idling are updated or renewed with a value obtained by leveling or averaging air-fuel ratio learning values KGI.sub.0 to KGI.sub.7 and KGS.sub.0 to KGS.sub.7 stored both at idling time and at non-idling time (step S145). Thereafter, purging of the evaporated fuel is started, and area learning of the air-fuel ratio is also executed by air-fuel ratio learning values KG.sub.0 to KG.sub.7 in respective areas.

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patent: 5337557 (1994-08-01), Toyoda

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