Exhaust gas-purifying device of an internal combustion engine

Details Exhaust gas-purifying device of an internal combustion engine Exhaust gas-purifying device of an internal combustion engine

1983-01-05

1985-03-26

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

261 44C, 261121B, 261DIG56, F02M 906

Patent

active

045066442

ABSTRACT:
An engine comprising a variable venturi-type carburetor which has a raised wall formed on the inner wall of the intake passage thereof. The suction piston of the carburetor has a tip face having a V-shaped cross-sectional upstream end portion which cooperates with the raised wall for defining an approximately isosceles triangle-shaped airflow-restricting opening therebetween when the amount of air flowing within the intake passage is small. An electromagnetic valve is arranged in an air-bleed passage of the carburetor and is periodically opened at a fixed frequency of 1 to 2 Hz so that the air-fuel ratio fluctuates at a fixed frequency within the range of .+-.0.2 A/F unit through a .+-.1.0 A/F unit relative to an approximately stoichiometric air-fuel ratio.

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Gandhi et al., "Laboratory Evaluation of Three-Way Catalysts", Society of Automotive Engineers, Inc. (Paper No. 760201, 1976 SAE Automotive Engineering Congress and Exposition, Detroit, MI) Feb. 1976.

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