Control valve
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United States of America Patent
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-
Feb 1, 2000
Grant Date -
N/A
app pub date -
Aug 13, 1998
filing date -
Aug 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Pumps and injectors having a control valve with an adjustable stroke for rate shaping and associated methods for operating a control valve are provided. The pump or injector comprises a body with a pumping chamber and a control valve chamber. A plunger is disposed in the pumping chamber. An actuatable control valve disposed in the control valve chamber controls fuel. The control valve includes a valve body moveable over an adjustable stroke range including opened and closed positions. The stroke range is adjustable to vary an effective open gap when the valve body is in the open position. An actuatable valve stop assembly adjacent to the control valve chamber includes a main body and a stop member that is moveable between extended and retracted positions. The stop member limits the stroke range such that the control valve has a first effective open gap when the stop member is in the extended position, and such that the control valve has a second effective open gap when the stop member is in the retracted position. A first armature and first stator assembly operate to actuate the control valve. A second armature and second stator assembly operate to actuate the valve stop assembly.
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