US 2003/0075153 A1Published application

Digital valve

AssigneeSiemens Diesel Systems Technology

InventorsUlrich Augustin, Robert Straub

Life of this patent

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Abstract

A control valve for a fuel injector generally includes a valve body and a spool positioned within a bore of said valve body. The spool is slideable between a first and second position. The control valve also comprises a first bore in fluid communication with a rail inlet of the fuel injector, a cross bore positioned within the valve body and offset from the first bore, and a groove located about the spool. The groove provides fluid communication between the cross bore and the first bore when the spool is in the first position, and seals fluid communication when the spool is in the second position. At least two solenoids are provided on opposing sides of the spool for moving the spool between the first and second positions, and a non-magnetic barrier is provided between the solenoids and the spool.

Claims15

Dependent claims

A control valve for a fuel injector, comprising:

a valve body;
a spool positioned within a bore of said valve body and slidable between a first position and a second position;
a first bore in fluid communication with a rail inlet of the fuel injector;
a cross bore positioned within said valve body and offset from said first bore;
a groove located about the spool, said groove providing fluid communication between said cross bore and said first bore when said spool is in the first position and sealing fluid communication between said first bore and said cross bore when said spool is in the second position;
at least two solenoids on opposing sides of said spool for moving said spool between the first and second positions;
and
a non-magnetic barrier for controlling latching forces between said spool and at least one of said at least two solenoids when said spool is in the first position or the second position, said latching forces being created by a current pulse of one of said at least two solenoids.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/106,123Filed 27 Mar 2002
Priority: 22 Oct 2001
Published: 24 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02M 57/026
Hydraulic, e.g. with pressure amplification: construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the…
F02M 59/366
By variably-timed valves controlling fuel passages to pumping elements or overflow passages: valves being actuated electrically
F02M 63/0019
Using electromagnetic operating means: characterised by the arrangement of electromagnets or fixed armatures
F02M 63/004
Characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details: sliding valves, e.g. spool…

Family

Application09/983,037Continuation in part · filed 22 Oct 2001
Application60/336,708Us provisional application · filed 7 Dec 2001
Application10/106,123Continuation in part · filed 27 Mar 2002
US 2002/0092501 A1Published application
US 6,526,943 B2Related patent
US 6,662,783 B2Related patent
US 2003/0075153 A1This patent

From the US filing history. Foreign family members aren’t listed.

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