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

1993-04-27

1994-04-05

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

052995461

ABSTRACT:
An air-fuel ratio control apparatus for an internal combustion engine for learning and controlling an air-fuel ratio accurately even during execution of purging of evaporated fuel. The evaporated fuel generated in a fuel tank is adsorbed to a canister, and the adsorbed fuel is evaporated and purged together with air to the intake side of the internal combustion engine through a purge valve. During normal purge rate control by the purge valve, air-fuel ratio feedback values detected by an oxygen sensor are averaged, and the concentration of the evaporated fuel taken into the internal combustion engine through the purge valve is detected by the deviation from a stoichiometric air-fuel ratio 1 of the averaged value and the purge rate. Further, after the lapse of a predetermined period of time after purging is started, air-fuel ratio learning values are renewed in accordance with the air-fuel ratio feedback value and stored in a RAM.

REFERENCES:
patent: 4748959 (1988-06-01), Cook
patent: 4831992 (1989-05-01), Jundt
patent: 4967713 (1990-11-01), Kojima
patent: 4977881 (1990-12-01), Abe
patent: 5048493 (1991-09-01), Orzel
patent: 5090388 (1992-02-01), Hamburg
patent: 5143040 (1992-09-01), Okawa
patent: 5188085 (1993-02-01), Habaguchi

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