Air-fuel ratio control system for internal combustion engines

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

1993-10-15

1995-03-21

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123703, F01N 320

Patent

active

053985010

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, a first air-fuel ratio sensor arranged upstream of the catalytic converter, and a second air-fuel ratio sensor arranged downstream of the catalytic converter, calculates an air-fuel ratio control variable, based on an output from the second air-fuel ratio sensor. An air-fuel ratio correction amount is calculated based on an output from the first air-fuel ratio sensor and the air-fuel ratio control variable. The air-fuel ratio of a mixture supplied to the engine is controlled based on the air-fuel ratio correction amount. The air-fuel ratio control variable is corrected in the rich direction such that the air-fuel ratio of the mixture supplied to the engine becomes richer, when deterioration of the catalytic converter is detected.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff
patent: 4729220 (1988-03-01), Terasaka
patent: 5099646 (1992-03-01), Nada
patent: 5154054 (1992-10-01), Nakane
patent: 5154055 (1992-10-01), Nakane
patent: 5172549 (1992-12-01), Kako
patent: 5203165 (1993-04-01), Wild
patent: 5209060 (1993-05-01), Hirschmann
patent: 5267472 (1993-12-01), Schneider

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