Air-fuel ratio control system for internal combustion engines, h

Details Air-fuel ratio control system for internal combustion engines, h Air-fuel ratio control system for internal combustion engines, h

1994-01-21

1995-02-07

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123703, F01N 322

Patent

active

053866959

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, and first and second air-fuel ratio sensors arranged upstream and downstream of the catalytic converter respectively has an ECU which calculates an air-fuel ratio correction amount, based at least on an output from the first air-fuel ratio sensor, and detects deterioration of the catalytic converter, based on an output from the second air-fuel ratio sensor when the engine is in a predetermined operating condition. The ECU inhibits detection of deterioration of the catalytic converter when the air-fuel ratio correction amount falls outside a predetermined range.

REFERENCES:
patent: 4106448 (1978-08-01), Noguchi
patent: 5074113 (1991-12-01), Matsuoka
patent: 5090199 (1992-02-01), Ikuta
patent: 5154055 (1992-10-01), Nakane
patent: 5228286 (1993-07-01), Demura
patent: 5247793 (1993-09-01), Yamada
patent: 5279114 (1994-01-01), Kurita
patent: 5280707 (1994-01-01), Nakashima
patent: 5311737 (1994-05-01), Komatsu
patent: 5325664 (1994-07-01), Seki

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