Air-fuel ratio control system for engine

Details Air-fuel ratio control system for engine Air-fuel ratio control system for engine

1994-03-29

1996-03-26

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

055012060

ABSTRACT:
An air-fuel ratio control system, has an air-fuel ratio feedback control for feedback controlling an-air-fuel ratio of a mixture to be supplied into an engine based on a parameter detected from an exhaust gas discharged from the engine so as to set said air-fuel ratio to a target air-fuel ratio in an internal combustion engine. Vaporized fuel is supplied from a fuel tank to the engine. During an initial interval, the supply of vaporized fuel gradually increases. Learning an updating of a control value are accomplished in the feedback control based on a deviation of the air-fuel ratio from the target air-fuel ratio during supply of the vaporized fuel. Upon a resumption of supply of vaporized fuel, a learned value setting arrangement gradually changes the learned control value from zero (0) to a learned control value obtained during a preceding period of supply of vaporized fuel according to a gradually increasing amount of supply of vaporized fuel over a given interval.

REFERENCES:
patent: 5213088 (1993-05-01), Harada
patent: 5243951 (1993-09-01), Nakaniwa
patent: 5245978 (1993-09-01), Orzel

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