Carburetor idle system control

Claim 2

An idle air fuel system for a carburetor having a main induction passage having one end connected to a source of air at essentially atmospheric pressure and its other end adapted to be connected to the intake manifold of an internal combustion engine to be subject to the change in vacuum therein and a throttle valve mounted across said passage to control flow therethrough and rotatably movable between an engine idle speed position essentially closing said main passage and a second position permitting an essentially unrestricted flow therethrough, said idle system including an air fuel emulsion passage in a circuit in parallel to said main passage, said emulsion passage having an air inlet at one end connected to said main induction passage at a location anterior of said throttle valve and a restricted fuelair outlet at the opposite end connected to said induction passage at a location posterior of said throttle valve, said one end of said emulsion passage containing a fuel jet connected to a source of fuel and positioned in the path of flow of air therepast from said air inlet and at an attitude effecting a discharge of fuel therefrom essentially along the axis of said emulsion passage, said latter passage being of a diameter sufficiently large relative to the size of said outlet that wetting of the walls of said emulsion passage by the fuel is essentially eliminated whereby fluctuations in fuel flow rate are minimized, said idle system including transfer port means opening into said main induction passage and straddled by said throttle valve in its engine idle speed position so as to variably control air fuel flow during idle and off idle speeds as a function of the position of said throttle valve, conduit means of smaller cross-sectional area connecting said transfer port to said emulsion passage, and flow restricting means in said latter means to control flow therethrough to minimize disturbances to flows through said emulsion passage.

Claim 3

An idle system as in claim 1, said flow restricting means being adjustable in area.

Claim 4

An idle air fuel system for a carburetor having a main induction passage having one end connected to a source of air at essentially atmospheric pressure and its other end adapted to be connected to the intake manifold of an internal combustion engine to be subject to the change in vacuum therein and a throttle valve mounted across said passage to control flow therethrough and rotatably movable between an engine idle speed position essentially closing said main passage and a second position permitting an essentially unrestricted flow therethrough, said idle system including an air fuel emulsion passage in a circuit in parallel to said main passage, said emulsion passage having an air inlet at one end connected to said main induction passage at a location anterior of said throttle valve and a restricted fuel-air outlet at the opposite end connected to said induction passage at a location posterior of said throttle valve, said one end of said emulsion passage containing a fuel jet connected to a source of fuel and positioned in the path of flow of air therepast from said air inlet and at an attitude effecting a discharge of fuel therefrom essentially along the axis of said emulsion passage, said latter passage being of a diameter sufficiently large relative to the size of said outlet that wetting of the walls of said emulsion passage by the fuel is essentially eliminated whereby fluctuations in fuel flow rate are minimized, said emulsion passage containIng wirelike means extending axially from said fuel jet through said emulsion passage whereby fuel discharged from said nozzle flows along the surface of said latter means and is retained thereagainst by the surface tension thereof, said guide means being mounted at one end essentially in the center of said fuel jet and being supported at its opposite end in said emulsion passage outlet wherein the increased air velocity of the flow therein effects a movement of said fuel away from said wirelike means and through said passage outlet in the form of an atomized spray.

Claim 5

An idle air fuel system for a carburetor having a main induction passage having one end connected to a source of air at essentially atmospheric pressure and its other end adapted to be connected to the intake manifold of an internal combustion engine to be subject to the change in vacuum therein and a throttle valve mounted across said passage to control flow therethrough and rotatably movable between an engine idle speed position essentially closing said main passage and a second position permitting an essentially unrestricted flow therethrough, said idle system including an air fuel emulsion passage in a circuit in parallel to said main passage, said emulsion passage having an air inlet at one end connected to said main induction passage at a location anterior of said throttle valve and a restricted fuel-air outlet at the opposite end connected to said induction passage at a location posterior of said throttle valve, said one end of said emulsion passage containing a fuel jet connected to a source of fuel and positioned in the path of flow of air therepast from said air inlet and at an attitude effecting a discharge of fuel therefrom essentially along the axis of said emulsion passage, said latter passage being of a diameter sufficiently large relative to the size of said outlet that wetting of the walls of said emulsion passage by the fuel is essentially eliminated whereby fluctuations in fuel flow rate are minimized, said emulsion passage containIng wirelike means extending axially from said fuel jet through said emulsion passage whereby fuel discharged from said nozzle flows along the surface of said latter means and is retained thereagainst by the surface tension thereof, said guide means being mounted at one end essentially in the center of said fuel jet and being supported at its opposite end in said emulsion passage outlet wherein the increased air velocity of the flow therein effects a movement of said fuel away from said wirelike means and through said passage outlet in the form of an atomized spray.