Air-fuel ratio control system for engines

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

1996-01-26

1998-11-10

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60288, 123688, 123685, F01N 300

Patent

active

058327240

ABSTRACT:
An air-fuel control system for an internal combustion engine is equipped with an exhaust system having a catalytic converter, a linear O.sub.2 sensor and a .lambda.O.sub.2 sensor for feedback controlling an air-fuel ratio on the basis of output representative of oxygen content from at least the linear O.sub.2 sensor. The system delivers a target air-fuel ratio of a fuel mixture. A determinant output, based on which the air-fuel ratio is feedback controlled, is shifted from output from the linear O.sub.2 sensor to output from the .lambda.O.sub.2 sensor before the linear O.sub.2 sensor is effectively active.

REFERENCES:
patent: 5090199 (1992-02-01), Ikuta
patent: 5159810 (1992-11-01), Grutter

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