Charge forming apparatus

Details Charge forming apparatus Charge forming apparatus

2006-04-18

2006-04-18

Chiesa, Richard L. (Department: 1724)

Gas and liquid contact apparatus

Fluid distribution

Pumping

C261S063000, C261S069100, C261SDIG074

Reexamination Certificate

active

07028993

ABSTRACT:
A charge forming apparatus for delivering a controlled mixture of fuel-and-air to an engine has a butterfly-type throttle-choke valve disposed in a fuel-and-air mixing passage. Incoming air flowing through a downstream primary venturi of the mixing passage creates a strong negative pressure which induces fuel flow through a feed passage into the venturi from a fuel metering chamber held at near atmospheric pressure. When the engine is decelerating, substantial closure of the choke valve creates a secondary venturi having a vacuum which dynamically counters the effect of the primary venturi vacuum reducing fuel flow through the feed passage and causing the engine to run leaner and preventing egine stalls and reducing emmissions.

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