Arrangement for controlling an air-fuel ratio of an air-fuel mix

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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123124R, 123124B, F02B 3300

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active

041694414

ABSTRACT:
An arrangement for controlling an air-fuel ratio of an air-fuel mixture depending on changes in the operating condition of an internal combustion engine provided with a catalytic converter comprises a main fuel passage to supply a fuel forming part of a lean air-fuel mixture distributed into the engine, an enriching fuel supply passage which is opened by a valve actuated in response to an output of an operating condition-detecting means to enrich the lean air-fuel mixture to a level slightly leaner than a stoichiometric air-fuel ratio, and an additional fuel supply passage having an additional fuel supply nozzle capable of supplying a predetermined amount of an additional fuel into the engine to minutely correct the air-fuel ratio of the slightly leaner air-fuel mixture to the stoichiometric air-fuel mixture level.

REFERENCES:
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patent: 3866588 (1975-02-01), Nakada et al.
patent: 3942493 (1976-03-01), Linder et al.
patent: 3977375 (1976-08-01), Laprade et al.
patent: 4007719 (1977-02-01), Brettenschnieder et al.
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patent: 4015568 (1977-04-01), Horiye et al.
patent: 4023357 (1977-05-01), Masaki
patent: 4057042 (1977-11-01), Aono
patent: 4062337 (1977-12-01), Rivere
patent: 4065920 (1918-01-01), Minami et al.
SAE Paper 750371, pp. 145-154, Spilski and Creps.

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