초록 ▼

A method of controlling hydraulically actuated electrically controlled unit fuel injectors to operate quietly and with less seat wear on a valve disposed therein is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the injector to inje

A method of controlling hydraulically actuated electrically controlled unit fuel injectors to operate quietly and with less seat wear on a valve disposed therein is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the injector to inject the proper amount of fuel in the cylinders of an internal combustion engine; and responding to changes in the pressure of the working fluid to vary the timing duration and amplitude of a current pulse which activates a stator that draws an armature to the stator and opens a first seat of the poppet valve or other flow regulating device against a spring bias to allow the high pressure working fluid into the injector and closes a second seat to prevent the working from draining from the injector to allow the working fluid to operate the injector. Upon deactivation of the stator the spring bias moves the armature away from the stator, closes the first seat and opens the second seat of the poppet valve in a manner that reduces noise and wear on the seats.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling hydraulically actuated electronically controlled unit fuel injector having a stator, an armature and a flow regulating device with a first and second seat and connected to the armature, the stator, when electrically actuated, draws the armature to

[ What is claimed is:] [1.] A method of controlling hydraulically actuated electronically controlled unit fuel injector having a stator, an armature and a flow regulating device with a first and second seat and connected to the armature, the stator, when electrically actuated, draws the armature to the stator and operates the flow regulating device to open a first valve seat to allow working fluid to operate an intensifier piston, which intensifies the pressure of fuel fed to the injector and injects the fuel into an associated cylinder of an internal combustion engine and closes a second valve seat, which when open allows working fluid to drain from the fuel injector, the method comprising the steps of:controlling the amount of fuel injected into the associated cylinder by regulating the pressure of the working fluid;generating an electrical pulse to actuate the stator and move the armature and allow the flow regulating device to inject fuel into the associated cylinder;varying the timing, duration, and amplitude of the pulse in response to changes in working fluid pressure to reduce noise and wear at idle, light load and normal load operation of the engine.