Air-fuel ratio feedback control for engines

Details Air-fuel ratio feedback control for engines Air-fuel ratio feedback control for engines

1998-08-31

2000-07-11

Yuen, Henry C.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60274, F01N 300

Patent

active

060855185

ABSTRACT:
An air-fuel ratio feedback control has an air-fuel ratio sensor and an oxygen sensor at an upstream side and a downstream side of a catalytic converter. A CPU feedback controls an air-fuel ratio detected by the air-fuel ratio sensor to a target air-fuel ratio, with a feedback gain being varied with an output of the oxygen sensor. The CPU further estimates an air-fuel ratio response speed based on a ratio between an exhaust gas flow amount and a capacity of the catalyst and determines a rate of deterioration of the catalyst. The CPU varies further the feedback gain based on the estimated response speed and the determined rate of deterioration.

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patent: 5619852 (1997-04-01), Uchikawa
patent: 5758494 (1998-06-01), Davey
patent: 5762055 (1998-06-01), Yamashita et al.
patent: 5797261 (1998-08-01), Akazaki et al.
patent: 5851376 (1998-12-01), Nishioka et al.

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