Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1993-11-01
1995-08-29
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, 60287, F01N 320
Patent
active
054449774
ABSTRACT:
An air/fuel ratio sensor abnormality detecting device avoiding influence of degradation of O.sub.2 storage effect of a catalyst due to deterioration, includes linear air/fuel ratio sensors for linearly detecting the air/fuel ratio being employed as upstream side and downstream side air/fuel ratio sensors, delay period deriving means for deriving a gas response delay period between the both air/fuel ratio sensors on the basis of the results of detection of the upstream side and downstream side air/fuel ratio sensors while the air/fuel ratio feedback control is effected under lean condition of the air/fuel ratio, and abnormality detecting means for detecting abnormality of the downstream side air/fuel ratio sensor on the basis of the derived delay period. Since the gas response delay period is derived on the basis of the results of detection in the upstream and downstream side linear air/fuel ratio sensors in a air/fuel ratio lean range which is not influenced by the O.sub.2 storage effect, the derived delay period is not influenced by the deterioration condition of the catalyst so that the abnormality detection for the downstream side linear air/flow rate sensor can be done with high accuracy. By employing the linear air/fuel ratio sensors, stable lean condition can be realized.
REFERENCES:
patent: 4908765 (1990-03-01), Murakami et al.
patent: 5022225 (1991-06-01), Sawada
patent: 5228286 (1993-07-01), Demura
patent: 5277161 (1994-01-01), Endou
Lazarus Ira S.
Nippondenso Co. Ltd.
O'Connor Daniel J.
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