Closed-loop fluidic control system for internal combustion engines
A closed-loop fluidic control servo system is described for a vehicle having an internal combustion engine provided with a variable venturi carburetor having an axially-shiftable spool operated by a vacuum motor. The system acts automatically through the motor to maintain the ratio of fuel-to-air supplied by the venturi carburetor to the intake manifold of the system at the optimum value during all prevailing conditions of engine speed and load encountered in vehicular operation. The system includes a vacuum amplifier coupled to the intake manifold and responsive to a differential vacuum signal developed between the pressures existing at the inlet and throat of the venturi to produce a proportionally amplified vacuum which is derived from the intake manifold vacuum and is a function of the vacuum signal. The proportionally amplified vacuum serves to energize the vacuum motor to shift the axial position thereof in a direction and to an extent bringing about the desired fuel-to-air ratio.
- Assignee:
- IFI; EDB-82-077555
- Patent Number(s):
- US 4308835
- OSTI ID:
- 5512146
- Resource Relation:
- Patent File Date: Filed date 10 Dec 1980; Other Information: PAT-APPL-214626
- Country of Publication:
- United States
- Language:
- English
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