Fuel enrichment system
AssigneeOutboard Marine Corporation
InventorsDonovan K. Jourdan, Henry C. Billingsley, Jeffrey A. Berg
Life of this patent
Estimating the term…
Abstract
Disclosed herein is 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 a temperature responsive valve for admitting air to the fuel enrichment conduit when the ambient temperature is above a predetermined level and for admitting air to the air induction passage when the engine temperature is below the predetermined level.
Claims23
A fuel supply system for an internal combustion engine, said system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a fuel enrichment conduit communicating between said fuel bowl and said air induction passage downstream of said throttle valve for delivering fuel unmixed with air to said air induction passage when the engine temperature is below a predetermined temperature level, a temperature responsive valve including a first port communicating with the atmosphere, a second port communicating with the fuel enrichment conduit between the fuel bowl and said air induction passage, a third port communicating with said air induction passage downstream of said throttle valve, and means including a temperature responsive element operative alternately for communicating said first and second ports when the engine temperature is above a predetermined temperature level and for communicating said first and third ports when the engine temperature is below said predetermined temperature level, whereby air is admitted to said fuel enrichment conduit when the engine temperature is above said predetermined temperature level and air is admitted to said air induction passage when the engine temperature is below said predetermined temperature level.
A fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a fuel enrichment conduit openly communicating between said fuel bowl and said air induction passage downstream of said throttle valve at all times for delivering fuel unmixed with air to said air induction passage downstream of said throttle valve when the engine temperature is below a predetermined level, and means for admitting air to said fuel enrichment conduit when the engine temperature is above said predetermined level.
A fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a fuel enrichment conduit openly communicating between said fuel bowl and said air induction passage downstream of said throttle valve at all times for delivering fuel unmixed with air to said air induction passage when the engine temperature is below a Predetermined level, and means for admitting air to said air induction passage when the engine temperature is below said predetermined level.
A fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a fuel enrichment conduit communicating between said fuel bowl and said air induction passage downstream of said throttle valve for delivering fuel unmixed with air to said air induction passage when the pressure in said air induction passage downstream of said throttle valve is above a predetermined level, and means responsive to the pressure in said air induction passage downstream of said throttle valve and communicating with said fuel enrichment conduit between said fuel bowl and said air induction passage for admitting air into said fuel enrichment conduit when the pressure in said air induction passage downstream of said throttle valve is below said predetermined level and independently of engine temperature.
A fuel supply system for an internal combustion engine, said system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a fuel enrichment conduit communicating between said fuel bowl and said air induction passage downstream of said throttle valve for delivering fuel unmixed with air to said air induction passage when the engine temperature is below a temperature predetermined level and the pressure in said air induction passage downstream of said throttle valve is above a predetermined pressure, a temperature responsive valve including a first port communicating with the atmosphere, a second port communicating with the fuel enrichment conduit between said fuel bowl and said air induction passage, a third port communicating with said air induction passage downstream of said throttle valve, and means including a thermally responsive member operative alternately for communicating said first and second ports when the engine temperature is above a predetermined temperature level and for communicating said first and third ports when the engine temperature is below said predetermined temperature level, whereby air is admitted to said fuel enrichment conduit when the engine temperature is above said predetermined temperature level and air is admitted to said air induction passage when the engine temperature is below said predetermined temperature level, and means responsive to the pressure in said air induction passage downstream of said throttle valve and communicating with said fuel enrichment conduit between said fuel bowl and said air induction passage for admitting air into said fuel enrichment conduit when the pressure in said air induction passage downstream of said throttle valve is below said predetermined level.
A fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a main nozzle communicating between said fuel bowl and said air induction passage, a fuel enrichment conduit openly communicating at all times between said fuel bowl and said air induction passage downstream of said throttle valve and independently of the communication of said main nozzle with said fuel bowl for delivering fuel unmixed with air to said air induction passage when the engine temperature is below a predetermined level, means for admitting air to said air induction passage when the engine temperature is below said predetermined level, and means responsive to the pressure in said air induction passage and communicating with said fuel enrichment conduit for admitting air to said fuel enrichment conduit.
A fuel supply system comprising a carburetor including a fuel bowl, an air induction passage including therein a venturi, a throttle valve located in said air induction passage downstream of said venturi, a main nozzle communicating between said fuel bowl and said air induction passage, a fuel enrichment conduit communicating between said fuel bowl and said air induction passage downstream of said throttle valve and independently of the communication of said main nozzle with said fuel bowl for delivering fuel unmixed with air to said air induction passage when the pressure in said air induction passage downstream of said throttle valve is above a predetermined level, and means responsive to the pressure in said air induction passage downstream of said throttle valve and communicating with said fuel enrichment conduit between said fuel bowl and said air induction passage for admitting air into said fuel enrichment conduit when the pressure in said air induction passage downstream of said throttle valve is below said predetermined level and independently of engine temperature.
Dependencies are inferred from the claim text.