Dual-sensor type air-fuel ratio control system for internal comb

Details Dual-sensor type air-fuel ratio control system for internal comb Dual-sensor type air-fuel ratio control system for internal comb

1994-09-21

1995-06-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

054269377

ABSTRACT:
A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter is disposed within an exhaust pipe for purifying an exhaust gas. A first air-fuel ratio sensor 11 is disposed upstream of the catalyst for detecting concentration of a particular component of the exhaust gas to output a first air-fuel ratio signal V1 indicating the concentration. A second air-fuel ratio sensor 12 is disposed downstream of the catalyst for detecting concentration of the particular exhaust gas component to output a second air-fuel ratio signal V2 indicating the concentration. An apparatus for detecting deterioration of the catalytic converter includes a deterioration decision means 54 for determining deterioration of the catalyst on the basis of at least the second air-fuel ratio signal, a filtering means 50 for filtering the second air-fuel ratio signal to thereby derive a filtered air-fuel ratio signal, and comparison means 51 for comparing the second air-fuel ratio signal with the filtered air-fuel ratio signal. The deterioration decision means compares a deterioration parameter value derived from the result of the comparison with a predetermined value corresponding to a detected operation state of the engine to determine deterioration of the catalyst when the deterioration parameter value exceeds the predetermined value.

REFERENCES:
patent: 3939654 (1976-02-01), Creps
patent: 5060473 (1991-10-01), Nakagawa
patent: 5220788 (1993-06-01), Kurita
patent: 5279114 (1994-01-01), Kurita
patent: 5280707 (1994-01-01), Nakashima
patent: 5301501 (1994-04-01), Shimizu
patent: 5307625 (1994-05-01), Junginger
patent: 5311737 (1994-05-01), Komatsu

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