Air-fuel ratio feedback control apparatus and method for...

Details Air-fuel ratio feedback control apparatus and method for... Air-fuel ratio feedback control apparatus and method for...

2006-03-14

2006-03-14

Argenbright, Tony M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S688000, C073S118040

Reexamination Certificate

active

07013214

ABSTRACT:
In a diagnosing process in which a target air-fuel ratio in an air-fuel ratio feedback control is forcibly changed, and based on a response time of a detection signal from an air-fuel ratio sensor to the change, a response characteristic of the air-fuel ratio sensor is diagnosed. When the diagnosis is finished, an air-fuel ratio feedback control signal is returned stepwise to a value immediately before the starting of diagnosis.

REFERENCES:
patent: 5758632 (1998-06-01), Yamashita et al.
patent: 6094975 (2000-08-01), Hasegawa et al.
patent: 11-264340 (1999-09-01), None

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