Abstract: An automatic control system for supplying a fuel-air mixture to an internal combustion engine through a Venturi structure conducting throttle-controlled incoming air to the intake manifold of the engine. Coaxially disposed in the casing of the structure is a cylindrical booster whose internal surface has a Venturi configuration to define a primary passage. Interposed between the booster and a ring having an external Venturi configuration mounted on the casing in an axially shiftable spool whose internal surface has a Venturi configuration to define a secondary passage having a variable throat between this surface and the spool. A tertiary passage is defined between the outer surface of the spool and the ring, incoming air passing through all three passages.

Abstract: An automatic control system for supplying a fuel-air mixture to an internal combustion engine including a variable-Venturi carburetor. Air is fed into the input of the Venturi, the air passing through the throat thereof whose effective area is adjusted by a mechanism operated by a servo motor. Fuel is fed into the input of the Venturi from a fuel reservoir through a main path having a fixed orifice and an auxiliary path formed by a metering valve operated by an auxiliary fuel-control motor. The differential air pressure developed between the inlet of the Venturi and the throat thereof is sensed to produce an air-velocity command signal that is applied to a controller adapted to compare the command signal with the servo motor set point to produce an output for governing the servo motor to cause it to seek a null point, thereby defining a closed process control loop.

Abstract: A tubular grid exhaust fume conducting heat exchanger is mounted on a horizontal top face of the fuel mixture manifold of an internal combustion motor, said grid supporting vertically centrally thereon a cylindrical tubular fuel and air mixing housing the upper end of which supports and receives air from an air filter, the lower portion of which housing has a butterfly valve mounted therein and connects downwardly, directly through said heat exchanger with said fuel mixture manifold.A jacketed and exhaust fume warmed fuel reserve canister provides a screen bottomed chamber which encloses a spherical plastic float and admits fuel axially downwardly into said chamber through a flow governing needle valve closed by said float when said float is lifted in said chamber by the fuel rising to its normal operating level.