Gas and liquid contact apparatus – Fluid distribution – Valved
Reexamination Certificate
1993-10-01
2001-03-06
Chiesa, Richard L. (Department: 1724)
Gas and liquid contact apparatus
Fluid distribution
Valved
C261S039500, C261S121400, C261SDIG008
Reexamination Certificate
active
06196524
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates generally to internal combustion engines which can be either of the two-stroke or four-stroke type. In addition, the invention relates to fuel feeding systems including systems for enriching fuel flow when the ambient air is below a predetermined temperature (and for discontinuing such fuel enrichment when the ambient air is above the predetermined temperature). Still further in addition, the invention relates to fuel feeding systems for enriching fuel flow when the vacuum condition in the air induction passage is above a predetermined absolute pressure and for discontinuing such enrichment when the vacuum condition in the air induction passage is below the predetermined absolute pressure.
SUMMARY OF THE INVENTION
The invention provides a fuel supply system for an internal combustion engine, which system comprises a carburetor a venturi, a throttle valve located in the air induction passage downstream of the venturi, a fuel enrichment conduit communicating between the fuel bowl and the air induction passage downstream of the throttle valve, and means for admitting air to the fuel enrichment conduit when the engine temperature is above a predetermined level and for admitting air to the air induction passage when the engine temperature is below the predetermined level.
The invention also provides a fuel supply system for an internal combustion engine, which system comprises a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in the air induction passage downstream of the venturi, a fuel enrichment conduit communicating between the fuel bowl and the air induction passage downstream of the throttle valve, and means for admitting air to the fuel enrichment conduit when the engine temperature is above a predetermined level.
The invention also provides a fuel supply system for an internal combustion engine, which system comprises a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in the air induction passage downstream of the venturi, a fuel enrichment conduit communicating between the fuel bowl and the air induction passage downstream of the throttle valve, and means for admitting air to the air induction passage when the engine temperature is below the predetermined level.
The invention also provides a fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in the air induction passage downstream of the venturi, a fuel enrichment conduit communicating between the fuel bowl and the air induction passage downstream of the throttle valve, and means responsive to the pressure in the air induction passage downstream of the throttle valve and communicating with the fuel enrichment conduit for admitting air to the fuel enrichment conduit when the pressure in the air induction passage downstream of the throttle valve is below a predetermined level.
The invention also provides a fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in the air induction passage downstream of the venturi, and means for supplying additional fuel to the air induction passage in response to the pressure condition in the air induction passage and including a pressure operated fuel pump having an outlet communicating with the air induction passage and having a pumping member subject to the pressure in the air induction passage.
Other features of and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
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Berg Jeffrey A.
Billingsley Henry C.
Jourdan Donovan K.
Armstrong Teasdale LLP
Chiesa Richard L.
Outboard Marine Corporation
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