Air to fuel ratio control system for internal combustion engine

Details Air to fuel ratio control system for internal combustion engine Air to fuel ratio control system for internal combustion engine

1978-10-19

1980-05-06

Lazarus, Ronald H.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EA, 123119R, 261121B, F02M 712

Patent

active

042011663

ABSTRACT:
An air to fuel ratio control system for an internal combustion engine having a fixed venturi type carburetor is disclosed. The air to fuel ratio control system comprises a device for extracting an atmospheric pressure within a venturi or a pressure corresponding to a relieved venturi vacuum, a device for extracting a static fuel pressure downstream of a main jet provided in a fuel path, a device for comparing those pressures directly or indirectly and a device for controlling the static fuel pressure in accordance with an output of the detecting device. Control is made such that the difference between those pressures is always maintained substantially constant. The air to fuel ratio control system may further comprise a device for detecting composition of exhaust gas of the engine. An output of the composition detecting device is applied to a control device which controls the static fuel pressure based on the output of the differential pressure detecting device and the output of the composition detecting device.

REFERENCES:
patent: 3750632 (1973-08-01), Zechnall
patent: 3949714 (1976-04-01), Mitchell
patent: 4023357 (1977-05-01), Masaki
patent: 4050428 (1977-09-01), Masaki
patent: 4092380 (1978-05-01), Pierlot
patent: 4103654 (1978-08-01), Nakamura
patent: 4111170 (1978-09-01), Nakajima et al.
patent: 4150645 (1979-04-01), Berent

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