EP 0253483 A2 19880120 - An air fuel control, and a plunger and barrel assembly for a fuel system, either for an internal combustion engine.
Title (en)
An air fuel control, and a plunger and barrel assembly for a fuel system, either for an internal combustion engine.
Title (de)
Luft-Kraftstoffregelung und Schlitzträger-Steurkolben für ein Kraftstoffsystem für eine Brennkraftmaschine.
Title (fr)
Réglage air-combustible, et tiroir et cylindre de commande pour un système d'alimentation en combustible, l'un et l'autre pour un moteur à combustion interne.
Publication
Application
Priority
US 88520086 A 19860714
Abstract (en)
A tamper-proof air fuel control for a compression ignition type i.c. engine is provided wherein fuel is supplied to cylinders in response to the pressure of air in the intake manifold. A pair of oppositely biased springs (40 and 42) controls movement of a stem valve (30) in response to intake manifold air pressure exerted on a flexible diaphragm (28) located between the springs (40 and 42). The stem valve (30) includes a plunger (32) within a barrel (31) in the air fuel control housing (20) in the engine fuel pump. The cross-sectional profiles of the plunger (32) and barrel (31) are designed to meter precisely a controlled amount of fuel to the engine fuel supply system as the intake air pressure increases and to reduce this metered flow as the intake air pressure decreases. A class fit between the barrel (31) and plunger (32) wherein the clearance must not exceed 1905 x 10<-><9> metres to 3175 x 10<-><9> metres (0.000075 to 0.000125 inches) and pressure regulating means in the plunger (32) substantially eliminate fuel leakage from the barrel (31). Internal venting means are provided to direct any minimal amount of fuel which might leak to the engine crankcase.
IPC 1-7
IPC 8 full level
F02D 1/06 (2006.01); F02D 3/00 (2006.01); F02D 7/00 (2006.01); F02M 59/20 (2006.01); F02M 69/00 (2006.01); F02M 69/52 (2006.01)
CPC (source: EP)
F02D 1/065 (2013.01); F02D 7/007 (2013.01); F02M 59/205 (2013.01)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0253483 A2 19880120; EP 0253483 A3 19890412; JP S6388270 A 19880419
DOCDB simple family (application)
EP 87304852 A 19870602; JP 17457087 A 19870713