Air-to-fuel ratio adjusting system for an internal combustion en

Details Air-to-fuel ratio adjusting system for an internal combustion en Air-to-fuel ratio adjusting system for an internal combustion en

1975-08-15

1977-10-11

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EE, 123119D, 123124B, F02D 104, F02D 3500, F02D 3300, F02B 1500

Patent

active

040529681

ABSTRACT:
A carburetor for applying air-fuel mixture to an internal combustion engine includes a main passage for applying air-fuel mixture and principally controlling the amount thereof.
The air-to-fuel ratio of the air-fuel mixture to be supplied to the engine is detected by an air-to-fuel ratio detector mounted in an exhaust pipe of the engine, and when the detected ratio is lower than a stoichiometrically optimum air-to-fuel ratio for perfect combustion of the air-fuel mixture additional air is supplied to the main passage through a bypass passage, the amount of which is controlled by a bypass valve mounted in the bypass passage.
An intake air pressure detecting device is mounted in an intake pipe of the engine, and when the detected pressure (absolute pressure) in the intake pipe becomes higher additional fuel is supplied to the main passage through an auxiliary fuel jet provided in the carburetor.

REFERENCES:
patent: 2621911 (1952-12-01), Lindsteadt
patent: 3738341 (1973-06-01), Loos
patent: 3745768 (1973-07-01), Zechnall et al.
patent: 3861366 (1975-01-01), Masaki et al.
patent: 3974813 (1976-08-01), Knapp et al.

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