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

1993-10-08

1994-11-15

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

053636473

ABSTRACT:
A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter disposed within an exhaust pipe is flanked by first and second upstream and downstream air-fuel ratio sensors 11, 12. An apparatus for detecting deterioration of the catalytic converter includes a deterioration decision circuit 54 for determining deterioration of the catalyst on the basis of at least the second air-fuel ratio sensor signal, a filter circuit 50 for filtering the second sensor signal, and a comparison circuit 51 for comparing the second sensor filtered and unfiltered signals. The deterioration decision circuit 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: 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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