Mixture forming assembly for closed loop air-fuel metering syste

Details Mixture forming assembly for closed loop air-fuel metering syste Mixture forming assembly for closed loop air-fuel metering syste

1978-07-24

1980-02-26

Lazarus, Ronald H.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123119R, 261121B, 261 69R, F02M 2304, F02M 2102

Patent

active

041900286

ABSTRACT:
The idle and main fuel passages of a carburetor are controlled by metering apparatus which is regulated to maintain the idle and part throttle air-fuel mixtures at a selected air-fuel ratio, but during low temperature engine operating conditions the part throttle mixture is leaner than the idle mixture in any particular regulated mode of the metering apparatus. This invention provides a mixture forming assembly which further includes means for leaning the idle mixture only during such low temperature operating conditions; the metering apparatus is then regulated to a rich mode at idle during low temperature engine operating conditions to provide an idle mixture which is leaned to the selected air-fuel ratio, and a lean part throttle mixture is avoided as the throttle is opened from idle to a part throttle position.

REFERENCES:
patent: 3936516 (1976-02-01), Nakagawa
patent: 4091780 (1978-05-01), Masaki
patent: 4135482 (1976-05-01), Bier et al.

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