Air-fuel ratio control system of internal combustion engine

Details Air-fuel ratio control system of internal combustion engine Air-fuel ratio control system of internal combustion engine

1994-06-10

1995-04-04

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123674, 123691, F01N 320

Patent

active

054026407

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine comprises a catalytic converter disposed in an exhaust line of the engine. The converter has an oxygen storage effect. First and second oxygen sensors are disposed in the exhaust line at positions upstream and downstream of the converter respectively. Each sensor varies the output in accordance the oxygen concentration in the exhaust gas flowing in the exhaust line. A first device is employed for deriving an air-fuel ratio feedback correction value in accordance with the output from the first oxygen sensor. A second device is employed for changing the air-fuel ratio feedback correction value of the first device in accordance with the output from the second oxygen sensor. A third device is employed for controlling the quantity of fuel fed to the engine in accordance with the air-fuel ratio feedback correction value derived by the first device. A fifth device is employed for detecting a converged condition of the oxygen storage effect of the catalytic converter. A fifth device is also employed for enabling the second device to operate only when the fourth device detects the converged condition of the oxygen storage effect of the converter.

REFERENCES:
patent: 5025767 (1991-06-01), Kume
patent: 5056308 (1991-10-01), Kume
patent: 5060474 (1991-10-01), Aramaki
patent: 5251437 (1993-10-01), Furuya
patent: 5255662 (1993-10-01), Nakajima
patent: 5335493 (1994-08-01), Uchida
patent: 5337555 (1994-08-01), Tokuda
patent: 5337558 (1994-08-01), Komatsu

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