Air-fuel ratio control apparatus for internal combustion...

Details Air-fuel ratio control apparatus for internal combustion... Air-fuel ratio control apparatus for internal combustion...

2005-12-20

2005-12-20

Solis, Erick (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S685000, C123S689000, C701S109000

Reexamination Certificate

active

06976483

ABSTRACT:
When an internal combustion engine is in a low load and low rotation operation, and also an elapsed time after the starting of engine operation is less than a predetermined period of time, a heater heating an air-fuel ratio sensor is turned OFF, to stop an air-fuel ratio feedback control. When the internal combustion engine is in the low load and low rotation operation after the predetermined period of time has elapsed, a low voltage is applied to the heater and also a gain is lowered, to perform the air-fuel ratio feedback control.

REFERENCES:
patent: 6304813 (2001-10-01), Ikeda et al.
patent: 6696673 (2004-02-01), Okamoto
patent: 6816774 (2004-11-01), Yasui et al.
patent: 6879906 (2005-04-01), Makki et al.
patent: 2002/0078938 (2002-06-01), Hada et al.
patent: 9-088688 (1997-03-01), None

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