Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1992-12-01
1993-10-26
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123672, 60276, F02B 7508, F01N 300
Patent
active
052556620
ABSTRACT:
A first O.sub.2 sensor is installed upstream, and a second O.sub.2 sensor downstream, of the catalyst converter in the exhaust passage of an engine. It is judged from the output of this first O.sub.2 sensor whether the air-fuel ratio (AFR) has changed beyond the theoretical AFR, and AFR feedback control is performed based on the judgment result. A correction value of an AFR feedback control coefficient is previously stored in each learning area in a memory corresponding to the engine running conditions, and the fuel injection amount supplied by the fuel injector is corrected based on this correction value.
The correction value is updated by an updating amount corresponding to the magnitude of the difference between the output of the second O.sub.2 sensor and a value corresponding to the theoretical AFR. Undershoot or overshoot of the AFR is thereby prevented, and the AFR is rapidly brought within a desired range.
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patent: 5090199 (1992-02-01), Ikuta et al.
patent: 5115639 (1992-05-01), Gopp
patent: 5129228 (1992-07-01), Kondo
patent: 5136842 (1992-08-01), Achleidnor et al.
patent: 5138833 (1992-08-01), Kabasin et al.
patent: 5158058 (1992-10-01), Yoshida et al.
patent: 5163290 (1992-11-01), Kinnear
patent: 5168700 (1992-12-01), Furuya
Nelli Raymond A.
Nissan Motor Company Ltd.
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