Patent ID: 7707993

Claim:
A method of operating a fuel injector to produce multiple injection events during a single injection sequence, comprising the steps of: closing a spill valve while moving a plunger of the fuel injector in response to rotation of a cam; moderating fuel pressure in the fuel injector above a valve opening pressure of a nozzle check valve, while the plunger is moving and the nozzle check valve is closed, by at least partially opening the spill valve; opening the nozzle check valve after initiating the moderating step; injecting fuel via the nozzle check valve for a first injection event of a plurality of injection events in an injection sequence prior to opening the spill valve; and injecting fuel via the nozzle check valve for a second injection event of the plurality of injection events in the injection sequence responsive to closing the spill valve; wherein the first injection event is a main injection; and the second injection event is a post injection; and wherein the closing of the spill valve includes a step of closing the spill valve after the moderating step and prior to a spill valve member of the spill valve reaching a fully open position.