Closed loop type air-fuel ratio control system of an internal co

Details Closed loop type air-fuel ratio control system of an internal co Closed loop type air-fuel ratio control system of an internal co

1981-10-21

1983-10-04

Lall, Parshotam S.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, F02B 300

Patent

active

044072473

ABSTRACT:
In an internal combustion engine having at its intake section a two-barrel type carburetor including a primary fuel supply system having a primary main fuel supply line and a primary slow fuel supply line and a secondary fuel supply system having a secondary main fuel supply line and a secondary step fuel supply line, and at its exhaust section a three-way catalytic converter, there is provided an improved closed loop type air-fuel ratio control system which controls not only the amount of air fed to the primary main and slow fuel supply lines but also the amount of air fed to the secondary main and step fuel supply lines in accordance with the concentration of a selected component of the engine exhaust gas. A switching valve is associated with both the primary slow fuel supply line and the secondary main or step fuel supply line so as to alter the course of the air introduction into the primary slow fuel supply line or into the secondary main or step fuel supply line in accordance with the engine load.

REFERENCES:
patent: 4050428 (1977-09-01), Masaki
patent: 4057042 (1977-11-01), Aono
patent: 4106464 (1978-08-01), Yamashita et al.
patent: 4192140 (1980-03-01), Yamashita et al.
patent: 4282840 (1981-08-01), Yamada et al.
patent: 4341190 (1982-07-01), Ishikawa et al.

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