Method and apparatus for controlling the air-fuel ratio in an in

Details Method and apparatus for controlling the air-fuel ratio in an in Method and apparatus for controlling the air-fuel ratio in an in

1998-12-02

2000-01-18

Solis, Erick R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

701109, F02D 4100

Patent

active

060149639

ABSTRACT:
A method and apparatus for controlling the air-fuel ratio in an internal combustion engine wherein, when the operating condition of the internal combustion engine has shifted between learning zones, a learning control updates a correction value after the shift is made in accordance with a stand-by function of a control unit to reduce the occurrence of mislearning, perform the correction value updating learning control efficiently and effect the purification of exhaust gases. In the air-fuel ratio controlling method for the internal combustion engine, when the operating condition of the engine has shifted between learning zones, a learning control updates a correction value in accordance with a stand-by function. In the air-fuel ratio controlling apparatus for the internal combustion engine, a stand-by function is added to the control unit so that, when the operating condition of the engine has shifted between learning zones, a learning control for updating a correction value after the shift is conducted in a delayed manner in accordance with a preset wait count. Further, a stand-by function is added to the control unit so that the correction value updates learning control after the shift is performed, in a delayed manner in accordance with a preset wait time.

REFERENCES:
patent: 4773016 (1988-09-01), Abe et al.
patent: 4872117 (1989-10-01), Suzuki et al.
patent: 4991102 (1991-02-01), Sakamoto et al.
patent: 5001643 (1991-03-01), Domino et al.
patent: 5713332 (1998-02-01), Adler et al.

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