Method and system for controlling engine air-fuel ratio

Details Method and system for controlling engine air-fuel ratio Method and system for controlling engine air-fuel ratio

1998-03-16

1999-11-02

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

701103, F02D 4114

Patent

active

059750669

ABSTRACT:
An air-fuel ratio in an engine provided with an air-fuel ratio control unit is controlled, by using an oxygen sensor disposed in an exhaust gas passage in operative association with the air-fuel ratio control unit, by the steps of setting a feedback control mode for detecting states of the exhaust gas by using the oxygen sensor, operating the engine in one of a plurality of operating areas which are sectioned in accordance with an engine operational conditions such as engine revolution speed, determining a correction value of the air-fuel ratio in accordance with the engine operation with respect to a set value, and calculating another correction value of the air-fuel ratio in another operating area on the basis of the correction value previosly determined.

REFERENCES:
patent: 4748956 (1988-06-01), Iwaki
patent: 5024199 (1991-06-01), Abe
patent: 5099817 (1992-03-01), Nakaniwa
patent: 5743244 (1998-04-01), Bush et al.

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