Engine air/fuel control system with adaptively alignment of a ca

Details Engine air/fuel control system with adaptively alignment of a ca Engine air/fuel control system with adaptively alignment of a ca

1995-11-17

1997-08-05

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60274, F01N 300

Patent

active

056531044

ABSTRACT:
An engine air/fuel control system is disclosed which is responsive to first and second exhaust gas oxygen sensors respectively positioned upstream and downstream of a catalytic converter. Air/fuel feedback control is disabled, and a rich offset to fuel flow is provided to cause a corresponding rich offset in engine air/fuel ratio. A predetermined time afterwards, a lean offset in fuel flow is provided. Air/fuel feedback control is reinitiated, and fuel delivery is biased with a rich fuel bias when the downstream sensor indicates excessively lean engine exhaust in response to the lean fuel offset and biased with a lean fuel bias when the downstream sensor indicates excessively rich exhaust gases in response to the rich fuel offset.

REFERENCES:
patent: 5211011 (1993-05-01), Nishikawa et al.
patent: 5426935 (1995-06-01), Ogawa
patent: 5472888 (1995-12-01), Douta et al.
patent: 5492094 (1996-02-01), Cullen et al.
patent: 5499500 (1996-03-01), Hamburg et al.
patent: 5528899 (1996-06-01), Ono
patent: 5537816 (1996-07-01), Ridgway et al.
patent: 5544481 (1996-08-01), Davey et al.

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