Air-fuel ratio feedback control method for internal combustion e

Details Air-fuel ratio feedback control method for internal combustion e Air-fuel ratio feedback control method for internal combustion e

1989-02-14

1990-05-22

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

049268287

ABSTRACT:
An air-fuel ratio feedback control method for an internal combustion engine in which when the engine is operating in a feedback control region, the concentration of an ingredient in exhaust gases from the engine is detected by an exhaust gas ingredient concentration sensor arranged in the exhaust system of the engine and compared with a reference value, and the air-fuel ratio of an air-fuel mixture to be supplied to the engine is controlled to a desired value in a feedback manner responsive to the result of the comparison. Atmospheric pressure is detected, and the reference value is set to a value depending on the detected value of atmospheric pressure. The reference value is set to a higher value as the detected value of atmospheric pressure is lower. The reference value is set to a lower value when the engine is operating in an idling region than when the engine is operating in a region other than the idling region.

REFERENCES:
patent: 4651700 (1987-03-01), Kobayashi et al.

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