Multicylinder internal combustion engine

Details Multicylinder internal combustion engine Multicylinder internal combustion engine

1976-10-08

1978-01-17

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 52M, 123 59A, 123119R, 123119LR, 123127, 60274, 60278, F02M 2506, F01N 315, F02B 7510

Patent

active

040686370

ABSTRACT:
An automotive multicylinder internal combustion engine is liable to emit noxious gases under medium and low load conditions. Such air-polluting emissions as hydrocarbons, carbon monoxide and oxides of nitrogen are effectively reduced by supplying a rich mixture with air-fuel ratio of approximately 12 to 14 to a group of its cylinders, and a lean mixture with air-fuel ratio of approximately 17 to 20 to the remaining cylinders. While under high load conditions, substantially the same mixture with air-fuel ratio of approximately 13 to 15 is supplied to all the cylinders to prevent a drop in engine output and improve fuel economy.

REFERENCES:
patent: 3943906 (1976-03-01), Hirose et al.
patent: 4000614 (1977-01-01), Abthoft et al.
patent: 4006722 (1977-02-01), Hata et al.
patent: 4024708 (1977-05-01), Takemoto

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