Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-11-25
1998-11-24
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123467, F02M 3704
Patent
active
058394125
ABSTRACT:
A method of controlling hydraulically actuated, electrically controlled unit fuel injectors to operate in response to the pressure of the working fluid or changes in the pressure of the working fluid is disclosed. The disclosed method comprises controlling the pressure of a high pressure working fluid which operates the fuel injector to inject the proper amount of fuel in the cylinders of an internal combustion engine and varying or adjusting the timing, duration and amplitude of a current pulse which activates the fuel injector in response to the pressure of the working fluid or changes thereto. The fuel injector is activated by energizing a stator that draws an armature to the stator and opens a first seat of the flow regulating device such as a poppet valve 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 improves the overall performance of the fuel injector.
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Rodier William J.
Stockner Alan R.
Baehr Fred J.
Caterpillar Inc.
Hampsch Robert J.
Miller Carl S.
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