초록 ▼

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 surfac

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. An air-fuel dispersion is fed into the primary passage to intermingle with air flowing therethrough to create an atomized mixture which is fed through the variable throat of the secondary passage to further atomize the mixture which is then fed into the manifold. The air pressure difference between the inlet to the Venturi and the effective throat of the combined passages is sensed to produce a command signal for governing a servo motor in a closed loop arrangement to adjust the axial position of the spool to attain an optimum fuel-air ratio.

대표청구항 ▼

An automatic control system for supplying a fuel-air mixture to the intake manifold of the internal combustion engine of a vehicle for regulating the ratio of air to fuel so that this ratio is optimized for prevailing conditions of engine speed and load, said system comprising: A. a variable Venturi

An automatic control system for supplying a fuel-air mixture to the intake manifold of the internal combustion engine of a vehicle for regulating the ratio of air to fuel so that this ratio is optimized for prevailing conditions of engine speed and load, said system comprising: A. a variable Venturi structure whose inlet is coupled to a source of incoming combustion air and whose outlet is coupled to said intake manifold, said structure including concentric passages constituted by a primary Venturi passage having a throat and leading to a secondary Venturi passage having a variable area throat, and a tertiary Venturi passage having a throat, incoming air flowing through an inlet into all three passages to said intake manifold, and a mechanism for adjusting said variable area throat; B. a servo motor operatively coupled to said mechanism to adjust said variable throat area; C. means to supply fuel into said primary passage to intermingle with the air passing therethrough to produce an air-fuel mixture; D. means communicating with said inlet and the throat of the tertiary passage to sense the pressure difference between that of the air at the inlet and that at the tertiary passage throat to produce a command signal that depends on the velocity of air flow through the Venturi structure; and E. a controller responsive to said command signal to govern said servo motor to adjust the area of the variable area throat and thereby change said air velocity so as to bring about the desired ratio of air and fuel in said mixture.