US 4,480,619 AGranted

Flow control device

AssigneeNippon Soken, Inc.

InventorsToshihiko Igashira, Yasuyuki Sakakibara, Toru Yoshinaga, Seiko Abe, Kazuhide Watanabe

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Abstract

A flow control device advantageously used in a fuel injection system for a diesel engine. The flow control device includes a spool valve defining on its sides first and second chambers which are connected with each other by means of a throttle. The second chamber is connected to a high pressure pipeline connecting a fuel pump with a fuel injector, while the first chamber is selectively opened to a relief line by means of an electrically operated valve. A cylinder has an annular groove opened to the relief line. When the valve is opened, the first chamber is opened to the relief line. A pressure difference is thus created between the first and the second chambers so as to move the spool valve to open. Thus fuel injection is stopped.

Claims45

Dependent claims

A flow control device arranged between a high pressure line and a relief line for control of pressure in the high pressure line, said device comprising:

a means for defining a cylinder bore;
a spool axially movably arranged in the cylinder bore;
first and second chambers formed on opposite sides of the spool in said cylinder bore, the spool having a throttle for attaining a fluid connection between the first and second chambers;
an electrically operated valve means for selectively opening the first chamber to the relief line, the second chamber being always in connection with the high pressure line;
a relief port means located at an inner surface of the cylinder bore for opening to the relief line;
a means for defining a stopper portion adjacent to said relief port means;
and
a means for resiliently urging the spool to abut the stopper portion to disconnect the second chamber from the relief port means, whereby the first chamber is opened to the relief line when the electrically operated valve means is open, causing a pressure difference to be created between the first and second chamber, to move the spool against the resilient means to open the second chamber to the relief line.

5 more elements

A fuel injection system for an internal combustion engine, comprising:

a fuel tank;
a high pressure pump operated by the engine,
a fuel injection means for introduction of fuel into the engine;
a high pressure line for connecting the high pressure pump to the fuel injection means;
a relief line for discharging excess fuel into the tank;
a flow control device comprising
a casing;
a means arranged in the casing for defining a cylindrical bore;
a spool axially movably arranged in the cylinder bore;
first and second chambers formed on opposite side of the spool in said cylinder bore, the spool having a throttle for attaining a fluid connection between the first and second chambers;
an electrically operated valve means for selectively opening the first chamber to the relief line;
the second chamber being always in connection with the high pressure line;
said means for defining the cylinder bore comprising a relief port means at its inner surface for opening to the relief pressure line and means for defining a stopper portion adjacent to said groove;
a means for resiliently urging the spool to abut the stopper portion to disconnect the second chamber from the relief port means;
and
a means for controlling the operation of the electrically operated valve means in accordance with the operational condition of the engine for controlling fuel injection of the internal combustion engine.

13 more elements

A fuel injection system for an internal combustion engine, comprising:

a fuel tank;
a high pressure pump operated by the engine;
a fuel injector means for introduction of fuel into the engine;
a low pressure line for connecting the fuel tank with the pump;
a high pressure line for connecting the high pressure pump to fuel injector;
a relief line for returning excess fuel to the tank;
a pressure multiplying means arranged in the high pressure line for obtaining a high pressure of fuel to be supplied to the fuel injector means;
a metering means for setting an amount of fuel to be directed to the injector;
a flow control device comprising:
a means for defining a cylinder bore;
a spool axially movably arranged in the cylindrical bore;
first and second chambers formed on opposite side of the spool in said bore, the spool having a throttle for attaining a fluid connection between the first and second chambers;
an electrically operated valve means for selectively opening the first chamber to the low pressure line;
the second chamber being always in connection with the high pressure line;
said means for defining the cylinder bore comprising a relief means at its inner surface for opening to the relief line and means for defining a stopper portion adjacent to said relief port means;
and
a means for resiliently urging the spool to abut the stopper portion to disconnect the second chamber from the relief port means;
and
a means for controlling the operation of the electrically operated valve means so that said opening is closed and opened at selected crank angles of the engine to control the amount of fuel to be measured by the metering means so as to correspond to a predetermined value at an operating condition of the engine.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/501,788Filed 7 Jun 1983
Priority: JP 57-990318 Jun 1982
Granted: 6 Nov 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02M 41/125
Characterised by means for varying fuel delivery or injection timing: variably-timed valves controlling fuel passages
F02M 59/105
Characterised by the piston-drive: hydraulic drive
F02M 59/36
Varying fuel delivery in quantity or timing: by variably-timed valves controlling fuel passages to pumping elements or overflow passages
F02M 59/366
By variably-timed valves controlling fuel passages to pumping elements or overflow passages: valves being actuated electrically