US Patent:
20030106533, Jun 12, 2003
Inventors:
John Crofts - Edinburgh IN, US
Arthur Truman - Columbus IN, US
Jung-min Sung - Columbus IN, US
Peter Rauznitz - Columbus IN, US
Assignee:
Cummins Ins. - Columbus IN
International Classification:
F02M001/00
Abstract:
An injector is provided which includes a nozzle valve element, a control volume, and an injection control valve including a control valve member for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a nozzle valve lift detecting device for detecting nozzle valve lift and providing a nozzle valve element lift feedback signal. Feedback signals are improved and control valve member oscillations are minimized by positioning a valve seat associated with the control valve member a spaced distance from the control volume, positioning a drain orifice such that the nozzle valve element restricts flow through a drain circuit when in an open position and extending the control valve member from the valve seat to the control volume to form an end wall of the control volume.