Air/fuel ratio control system for internal combustion engine

Details Air/fuel ratio control system for internal combustion engine Air/fuel ratio control system for internal combustion engine

1990-06-27

1992-03-17

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

60276, F02D 4114

Patent

active

050958780

ABSTRACT:
An air/fuel ratio control system is provided for use with an internal combustion engine. The system includes a first air/fuel ratio detector arranged on an upstream side of a catalytic converter so as to detect the air/fuel ratio of the engine from components of exhaust gas, a second air/fuel ratio detector arranged in the exhaust system and having a detection response speed slower than the first air/fuel ratio detector, a device for controlling the air/fuel ratio of the engine on the basis of results of a comparison between a detection value from the first air/fuel ratio detector and a predetermined first reference value, a device for effecting a correction to the control of the air/fuel ratio by the air/fuel ratio control device on the basis of results of a comparison between a detection value from the second air/fuel ratio detector and a predetermined second reference value, and a device for shifting the second reference value to a lean air/fuel ratio side in a specific operation state of the engine.

REFERENCES:
patent: 4117815 (1978-10-01), Ikeura
patent: 4156413 (1979-05-01), Taplin
patent: 4253302 (1981-03-01), Asano et al.
patent: 4337746 (1982-07-01), Masaki
patent: 4362605 (1982-12-01), Bozon et al.
patent: 4809501 (1989-03-01), Kayanuma et al.
patent: 4926828 (1990-05-01), Fujimoto et al.
patent: 5025767 (1991-06-01), Kume et al.

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