Fluidic carburetor

Claim 2

A fluidic carburetor including means defining a carburetor bore through which air may flow to the intake manifold of an engine; a fluid amplifier having a power stream input, first and second outputs, and first, second, third and fourth control inputs; a fluid capacitance means connected between said first and second control inputs, said first and second control inputs being disposed on opposing sides of said power stream input; means for applying a positive pressure signal to said third control input that reduces with engine speed, said third control input being disposed on the same side of said power stream input as said first control input; meanS for applying fuel to said power stream input; fuel return means connected to said first output; means for conveying fuel from said second output to said bore; and, means connected between said manifold and said second and fourth control inputs for applying a signal representing manifold vacuum to said capacitance means and said second and fourth control inputs, said control inputs coacting to deflect said power stream to said second output for a predetermined interval of time when said manifold vacuum drops.

Claim 3

A fluidic carburetor as claimed in claim 1 wherein said bore has a Venturi throat formed therein, said carburetor further comprising: a second fluid amplifier having a power stream input, first and second outputs, and first and second control inputs; first means connected to said first control input and terminating at a first orifice in said throat for applying a first control signal to said second amplifier dependent upon the vacuum at said throat; second means connected to said second control input and terminating at a second orifice in said bore upstream of said throat for applying a second control signal to said second amplifier dependent upon the vacuum at said second orifice; means for supplying fuel to the power stream of said second amplifier; said second output being connected to said fuel return means and to said means for applying a positive pressure signal to the third control input of said fluid amplifier; and, means connected to said second output of said second fluid amplifier for injecting fuel into said bore, said first and second control signals controlling said second fluid amplifier to direct more of its power stream to said second output and less to said first output as said first signal increases in magnitude with respect to said second signal.

Claim 4

A fluidic carburetor as claimed in claim 2 and further comprising: temperature sensing means disposed to sense engine temperature, said temperature sensing means including means for reducing the magnitude of said first control signal relative to the vacuum at said throat as said engine temperature approaches normal operating temperature.

Claim 5

A fluidic carburetor as claimed in claim 2 and further comprising a throttle valve in said bore downstream of said throat.

Claim 6

A fluidic carburetor as claimed in claim 2 wherein said first means comprise an air passage including a temperature sensitive capillary tube responsive to engine temperature.

Claim 7

A fluidic carburetor as claimed in claim 5 wherein said first means includes a further temperature sensitive capillary tube disposed in said bore for sensing the temperature of the air flowing therethrough.