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Title: Air-fuel ratio control apparatus of a fuel supply system for an internal combustion engine

Abstract

An air-fuel ratio control apparatus for an internal combustion engine has an air valve disposed in an intake passage downstream of a throttle valve to cooperate therewith to define an air pressure chamber and operative to maintain a substantially constant pressure therein. A fuel circuit includes a fuel discharge port open to the intake passage and a fuel-metering orifice operatively associated with the air valve such that the fuel-flowing section of the orifice is varied in proportion to the air-flowing section of the air valve. A constant differential fuel pressure valve is disposed in the fuel circuit to maintain a substantially constant fuel pressure difference across the fuel metering orifice during normal engine operation. The differential fuel pressure valve is mechanically operatively connected to a piston-cylinder assembly into which the fuel pressure upstream of the fuel-metering orifice is introduced. The position of the piston relative to the cylinder is varied when the engine operating condition is varied. The movement of the piston varies the fuel-flowing section of the differential fuel pressure valve thereby to vary the fuel pressure difference across the fuelmetering orifice whereby the air-fuel ratio is varied when the engine operating condition is varied.

Inventors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
5712644
Patent Number(s):
US 4207849
Assignee:
Aisan Industry Co Ltd (Japan); Toyota Jidosha Kogyo K K (Japan)
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 30 Aug 1977, Japan; Other Information: PAT-APPL-932939
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; FUEL-AIR RATIO; CONTROL SYSTEMS; INTERNAL COMBUSTION ENGINES; FLUID FLOW; FUEL SYSTEMS; VALVES; CONTROL EQUIPMENT; ENGINES; EQUIPMENT; FLOW REGULATORS; HEAT ENGINES; 330100* - Internal Combustion Engines

Citation Formats

Ando, T, Minoura, M, Motosugi, K, Sekiya, S, Sumiyoshi, M, Takeuchi, Y, and Uozumi, J. Air-fuel ratio control apparatus of a fuel supply system for an internal combustion engine. United States: N. p., 1980. Web.
Ando, T, Minoura, M, Motosugi, K, Sekiya, S, Sumiyoshi, M, Takeuchi, Y, & Uozumi, J. Air-fuel ratio control apparatus of a fuel supply system for an internal combustion engine. United States.
Ando, T, Minoura, M, Motosugi, K, Sekiya, S, Sumiyoshi, M, Takeuchi, Y, and Uozumi, J. Tue . "Air-fuel ratio control apparatus of a fuel supply system for an internal combustion engine". United States.
@article{osti_5712644,
title = {Air-fuel ratio control apparatus of a fuel supply system for an internal combustion engine},
author = {Ando, T and Minoura, M and Motosugi, K and Sekiya, S and Sumiyoshi, M and Takeuchi, Y and Uozumi, J},
abstractNote = {An air-fuel ratio control apparatus for an internal combustion engine has an air valve disposed in an intake passage downstream of a throttle valve to cooperate therewith to define an air pressure chamber and operative to maintain a substantially constant pressure therein. A fuel circuit includes a fuel discharge port open to the intake passage and a fuel-metering orifice operatively associated with the air valve such that the fuel-flowing section of the orifice is varied in proportion to the air-flowing section of the air valve. A constant differential fuel pressure valve is disposed in the fuel circuit to maintain a substantially constant fuel pressure difference across the fuel metering orifice during normal engine operation. The differential fuel pressure valve is mechanically operatively connected to a piston-cylinder assembly into which the fuel pressure upstream of the fuel-metering orifice is introduced. The position of the piston relative to the cylinder is varied when the engine operating condition is varied. The movement of the piston varies the fuel-flowing section of the differential fuel pressure valve thereby to vary the fuel pressure difference across the fuelmetering orifice whereby the air-fuel ratio is varied when the engine operating condition is varied.},
doi = {},
url = {https://www.osti.gov/biblio/5712644}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {6}
}