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

1988-05-04

1990-04-03

Dolinar, Andrew M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123489, F02D 4114

Patent

active

049129260

ABSTRACT:
An air/fuel ratio control system is provided for an internal combustion engine. The system includes first and second oxygen density sensors, an air/fuel ratio control device and a standard-value changing device. The first oxygen density sensor is arranged on an upstream side of a catalytic converter, while the second oxygen density sensor is provided either inside or on a downstream side of the catalytic converter. The air/fuel control device controls the air/fuel ratio of the internal combustion engine on the basis of results of comparison between a detection value from one of the first and second oxygen density sensors and a predetermined standard value. The standard-value changing device changes the standard value on the basis of outputs from the first and second oxygen density sensors.

REFERENCES:
patent: 3939654 (1976-02-01), Creps
patent: 4027477 (1977-06-01), Storey
patent: 4235204 (1980-11-01), Rice
patent: 4712373 (1987-12-01), Nagai et al.

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