Double air-fuel ratio sensor system in internal combustion engin

Details Double air-fuel ratio sensor system in internal combustion engin Double air-fuel ratio sensor system in internal combustion engin

1991-03-29

1992-08-04

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

051348470

ABSTRACT:
In a double air-fuel ratio sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, the actual air fuel ratio is adjusted in accordance with the air-fuel ratio correction amount calculated by using the output of the upstream-side air-fuel ratio sensor and the output of the downstream-side air-fuel ratio sensor. In this system, a detection whether or not the catalyst converter is deteriorated is carried out by using the output of the downstream-side air-fuel ratio sensor when the feedback control condition is satisfied. This detecting operation is prohibited when the upstream-side air-fuel ratio sensor is in an abnormal state.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4177787 (1979-12-01), Hattori
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 4817383 (1989-04-01), Masui

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