When considering standard EHI operation in a typical CR diesel fuel system, what happens the instant the actuator is energized?
A) pressure builds in the upper (control) pressure field
B) pressure collapses in the upper (control) pressure field
C) pressure builds in the lower pressure field
D) pressure collapses in the lower pressure field

Question

Quizplus · Accepted Answer

When the actuator in an Electro-Hydraulic Injector (EHI) of a Common Rail (CR) diesel fuel system is energized, pressure collapses in the upper (control) pressure field. This is because energizing the actuator typically opens a valve that allows the high-pressure fuel in the control chamber to escape, reducing the pressure in that area.

When Considering Standard EHI Operation in a Typical CR Diesel