Air-fuel ratio control system for an internal combustion engine

Details Air-fuel ratio control system for an internal combustion engine Air-fuel ratio control system for an internal combustion engine

1984-08-28

1986-04-29

Cuchlinski, Jr., William A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123589, 123179G, F02M 108

Patent

active

045849790

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having an oxygen concentration sensor for a feedback control of air-fuel ratio, including an intake air temperature sensing means and a control means for operating/stopping the feedback control of air-fuel ratio in accordance with the detected value of the intake air temperature. When the intake air temperature is below a predetermined level, the feedback control is stopped, and an auxiliary fuel supply means is activated, and at the same time a supply of atmospheric air into a slow speed fuel supply system of the engine is stopped. Thus, the air-fuel ratio is controlled to the rich side when the open loop control is selected, in order to secure a stable engine operation.

REFERENCES:
patent: 4364354 (1982-12-01), Kosuge et al.
patent: 4407247 (1983-10-01), Masaki
patent: 4480618 (1984-11-01), Kamifuji et al.

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