Liquid fuel carburetion system

A carburetion system for an internal combustion engine comprising:

• an air inlet into the engine, said air inlet being of fixed configuration and having upstream and downstream ends;
• a fuel reservoir adapted to contain a level of liquid fuel therein;
• main conduit means of predetermined fluid flowing capacity;
• said main conduit means intersecting said air inlet proximate said upstream end such that a pressure reduction proportional to the quantity of air flowing through said air inlet is applied to said main conduit means;
• throttle valve means disposed in said air inlet downstream from said intersection;
• fuel conduit means connecting said main conduit means to liquid fuel in said reservoir;
• auxiliary conduit means of predetermined fluid flowing capacity connected to said main conduit means and connected to said air inlet downstream from said throttle valve means;
• the connection of said auxiliary conduit means to said main conduit means located above the plane of the liquid fuel level in said reservoir when the engine is operating at idle load condition such that air from said air inlet is flowed through said main conduit means into said auxiliary conduit means to cause an auxiliary pressure reduction of predetermined magnitude to be generated in said main conduit means;
• said predetermined fluid flowing capacity of said auxiliary conduit means specifically proportioned to said predetermined fluid flowing capacity of said main conduit means such that the quantity of air flowed into said auxiliary conduit means from said main conduit means determines said magnitude of said auxiliary pressure reduction;
• said auxiliary pressure reduction being such that an essentially correct amount of fuel is metered to said engine at all speeds and loads;
• said pressure reduction and auxiliary pressure reduction functioning cooperatively in acting on said fuel conduit means to cause fuel to flow from said fuel reservoir into said fuel conduit means;
• whereby fuel is metered from said fuel conduit means into said main and auxiliary conduit means to be delivered to said air inlet.

A carburetion system for an internal combustion engine comprising:

• an air inlet into the engine, said air inlet being of fixed configuration and having upstream and downstream ends;
• a fuel reservoir adapted to contain a level of liquid fuel therein;
• main conduit means of predetermined fluid flowing capacity;
• said main conduit means intersecting said air inlet proximate said upstream end such that a pressure reduction proportional to the quantity of air flowing through said air inlet is applied to said main conduit means;
• throttle valve means disposed in said air inlet downstream from said intersection;
• fuel conduit means connecting said main conduit means to liquid fuel in said reservoir;
• auxiliary conduit means of predetermined fluid flowing capacity connected to said main conduit means and connected to said air inlet downstream from said throttle valve means;
• the connection of said auxiliary conduit means to said main conduit means located between said intersection and any operating level of essentially liquid fuel in said main and fuel conduit means when the engine is operating at idle load condition such that air from said air inlet is flowed through said main conduit means into said auxiliary conduit means to cause an auxiliary pressure reduction of predetermined magnitude to be generated in said main conduit means;
• said predetermined fluid flowing capacity of said auxiliary conduit means specifically proportioned to said predetermined fluid flowing capacity of said main conduit means such that the quantity of air flowed into said auxiliary conduit means from said main conduit means determines said magnitude of said auxiliary pressure reduction;
• said auxiliary pressure reduction being such that an essentially correct amount of fuel is metered to said engine at all speeds and loads;
• said pressure reduction and auxiliary pressure reduction functioning cooperatively in acting on said fuel conduit means to cause fuel to flow from said fuel reservoir into said fuel conduit means;
• whereby fuel is metered from said fuel conduit means into said main and auxiliary conduit means to be delivered to said air inlet.

A carburetion system for an internal combustion engine comprising:

• air inlet conduit means of fixed configuration supplying air to said engine;
• venturi means disposed in said air inlet conduit means for generating a pressure reduction proportional to the amount of air flowing therethrough;
• throttle valve means disposed in said air inlet conduit means downstream from said venturi means;
• liquid fuel reservoir means;
• main conduit means of predetermined fluid flowing capacity in communicative connection with said air inlet conduit means proximate said venturi means such that said pressure reduction is applied to said main conduit means;
• fuel conduit means connecting said main conduit means to said liquid fuel reservoir means for transporting liquid fuel from said reservoir to said main conduit means;
• auxiliary conduit means of predetermined fluid flowing capacity connecting said main conduit means to said air inlet conduit means at a location downstream of said throttle valve means;
• said connection of said auxiliary conduit means to said main conduit means located between said connection of said main conduit means with said air inlet conduit means and any operating level of essentially entirely liquid fuel in said fuel conduit and main conduit means when said engine is operating at idle load condition such that air from said air inlet conduit means is flowed through said main conduit means into said auxiliary conduit means to cause an auxiliary pressure reduction of predetermined magnitude to be generated in said main conduit means;
• said predetermined fluid flowing capacity of said auxiliary conduit means being specifically proportioned to said predetermined fluid flowing capacity of said main conduit means such that the quantity of air flowed into said auxiliary conduit means from said main conduit means determines said magnitude of said auxiliary pressure reduction;
• said auxiliary pressure reduction being such that an essentially correct amount of fuel is metered to said engine at all speeds and loads;
• said pressure reduction and auxiliary pressure reduction functioning cooperatively in acting on said fuel
• conduit means to cause fuel to flow from said reservoir into said fuel conduit means;
• whereby fuel is delivered from said fuel reservoir to said air inlet conduit means.

A carburetion system for an internal combustion engine comprising:

• air inlet conduit means of fixed configuration supplying air to said engine;
• venturi means disposed in said air inlet conduit means for generating a pressure reduction proportional to the amount of air flowing therethrough;
• throttle valve means disposed in said air inlet conduit means downstream from said venturi means;
• liquid fuel reservoir means;
• main conduit means of predetermined fluid flowing capacity in communicative connection with said air inlet conduit means proximate said venturi means such that said pressure reduction is applied to said main conduit means;
• fuel conduit means connecting said main conduit means to said liquid fuel reservoir means for transporting liquid fuel from said reservoir to said main conduit means;
• fuel vaporizing means for vaporizing liquid fuel;
• fuel vaporizing inlet conduit means of predetermined fluid flowing capacity connecting said main conduit means to said vaporizing means;
• said connection of said fuel vaporizing inlet conduit means to said main conduit means located between said connection of said main conduit means with said air inlet conduit means and any operating level of essentially entirely liquid fuel in said fuel conduit and main conduit means when said engine is operating at idle load condition such that air from said air inlet conduit means is flowed through said main conduit means into said fuel vaporizing inlet conduit means to cause an auxiliary pressure reduction of predetermined magnitude to be generated in said main conduit means;
• said predetermined fluid flowing capacity of said fuel vaporizing inlet conduit means being specifically proportioned to said predetermined fluid flowing capacity of said main conduit means such that the quantity of air flowed into said fuel vaporizing inlet conduit means from said main conduit means determines said magnitude of said auxiliary pressure reduction;
• said auxiliary pressure reduction being such that an essentially correct amount of fuel is metered to said engine at all speeds and loads;
• said pressure reduction and auxiliary pressure reduction functioning cooperatively in acting on said fuel conduit means to cause fuel to flow from said reservoir into said fuel conduit means;
• and
• fuel vaporizing outlet conduit means connecting said fuel vaporizing means to said air inlet conduit means at a location downstream of said throttle valve means;
• whereby fuel is delivered from said fuel reservoir to said air inlet conduit means.

A method for metering fuel to an internal combustion engine in a fuel system having:

• an air inlet of fixed configuration into the engine;
• a fuel reservoir;
• throttle valve means disposed in said air inlet;
• and
• first passageway means of predetermined fluid flowing capacity connected to said air inlet upstream from said throttle valve means and connected to fuel in said fuel reservoir, said method comprising:
• flowing air from said first conduit means to said air inlet downstream from said throttle valve means through second passageway means of predetermined fluid flowing capacity;
• generating a pressure reduction of predetermined magnitude in said first passageway means, said pressure reduction resulting from the air flowing out of said first passageway means into said second passageway means;
• flowing air from said air inlet into said first passageway means to replace air flowed out of said first passageway means into said second passageway means;
• specifically proportioning said predetermined fluid flowing capacity of said second passageway means to said predetermined fluid flowing capacity of said first passageway means such that said magnitude of said pressure reduction is determined;
• and
• determining said magnitude such that an essentially correct amount of fuel is delivered from said reservoir to said engine at all speed and load conditions.