Digital valve
AssigneeSiemens Diesel Systems Technology
InventorsUlrich Augustin, Robert Straub
Life of this patent
Estimating the term…
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
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.
A fuel injector, comprising:
- a fuel injector body portion;
- and
- a control valve for controlling a flow of a working fluid to said fuel injector body portion, said control valve 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 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.
Dependencies are inferred from the claim text.