Air/fuel ratio control apparatus

Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means

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F05D 4114

Patent

active

056900864

ABSTRACT:
An apparatus for use with an internal combustion engine having a fuel vapor trap from which fuel vapor is purged into the engine through a purge passage having a purge control valve provided therein. The purge control valve is controlled to permit fuel vapor purge through the purge passage based on the existing engine operating conditions. An air/fuel ratio feedback control correction factor is calculated to correct the air/fuel ratio within a predetermined range based on the air/fuel ratio of the mixture supplied to the engine. A gain value is calculated based on a deviation between the air/fuel ratio feedback correction factor calculated with the fuel vapor purge and the air/fuel ratio feedback correction factor calculated without the fuel vapor purge and a purge rate of the fuel vapor flow rate to the intake air flow rate. The calculated gain values are stored in a memory in respective memory locations addressable by different fuel vapor amounts. The calculated gain value is stored in the memory in a memory location corresponding to the sensed fuel vapor amount to update a gain value stored previously in the memory location. A gain value is read from the memory location corresponding to the fuel vapor amount. The amount of fuel supplied to the engine is controlled according to a target value calculated based on the read gain value and the engine operating conditions.

REFERENCES:
patent: 4821701 (1989-04-01), Nankee, II et al.
patent: 4977881 (1990-12-01), Abe et al.
patent: 5090388 (1992-02-01), Hamburg et al.
patent: 5404862 (1995-04-01), Ohta et al.
patent: 5423307 (1995-06-01), Okawa et al.
patent: 5425349 (1995-06-01), Nagaishi et al.

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