Patent ID: 6253736
Filing Date: 2001-07-03
Classification: F02D,F02M

Abstract:
A closed nozzle injector for injecting fuel at high pressure into the combustion chamber of an engine, comprising:an injector body containing an injector cavity and an injector orifice communicating with one end of said injector cavity to discharge fuel into the combustion chamber;a nozzle valve element positioned in one end of said injector cavity adjacent said injector orifice, said nozzle valve element movable between an open position in which fuel may flow through said injector orifice into the combustion chamber and a closed position in which fuel flow through said injector orifice is blocked;a control volume positioned to receive a pressurized supply of fuel;a drain circuit for draining fuel from said control volume to a low pressure drain;an injection control valve positioned along said drain circuit to control fuel flow from said control volume, said injection control valve including a reciprocally mounted control valve member positioned in said control volume; andnozzle valve element lift detecting means for detecting movement of said nozzle valve element into said open position and for providing a nozzle valve element lift feedback signal.