Fuel injector with piezoelectric actuator preload

Details Fuel injector with piezoelectric actuator preload Fuel injector with piezoelectric actuator preload

2006-11-28

2006-11-28

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C239S102200, C239S533200

Reexamination Certificate

active

07140353

ABSTRACT:
An piezoelectric actuated 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 preload chamber positioned along an injection control valve member for receiving high pressure fuel. The high pressure fuel acts on the injection control valve member to apply a preload force to supply a preload force to the stack of piezoelectric elements thereby ensuring more accurate control over fuel injection timing and metering.

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