Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-10-04
1997-12-02
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100, F02M 2300, F02M 2500
Patent
active
056924860
ABSTRACT:
An air-fuel ratio sensor deterioration-detecting system is provided for an internal combustion engine having first and second air-fuel ratio sensors arranged in the exhaust system upstream and downstream of a catalytic converter therein. An ECU calculates a control parameter, based on an output from the second air-fuel ratio sensor, calculates an air-fuel ratio correction amount, based on an output from the first air-fuel ratio sensor and the calculated control parameter, and executes air-fuel ratio feedback control, based on the calculated air-fuel ratio correction amount. The ECU also determines deterioration of the second air-fuel ratio sensor, based on the output from the same in such a manner that the air-fuel ratio correction amount is increased or decreased by a predetermined amount, based on the output from the second air-fuel ratio when a variation in the second air-fuel ratio sensor output falls within a predetermined small variation range during execution of the air-fuel ratio feedback control, and the second air-fuel ratio sensor is determined to be deteriorated when the output variation falls within the predetermined small variation range even after the increase or decrease of the air-fuel ratio correction amount.
REFERENCES:
patent: 5396765 (1995-03-01), Maruyama et al.
patent: 5462040 (1995-10-01), Krebs et al.
patent: 5526798 (1996-06-01), Seki
patent: 5577488 (1996-11-01), Sato et al.
Fujiki Yuji
Fujimoto Sachito
Hachiro Toshitaka
Hara Fumio
Kashiwabara Shigeto
Honda Giken Kogyo Kabushiki Kaisha
Nelli Raymond A.
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