EMDEC Settings and Adjustments - Part 1-2 

EMDEC Settings and Adjustments - Part 1-2
EMDEC System on EMD 710 engine series: (Electronic Fuel Injection )
EMDEC is an acronym for the Electro Motive Diesel Engine Control system.
EMDEC is an electronic engine speed control and fuel management system. It is designed to provide optimal control of critical turbo charged engine functions which affect fuel economy, smoke, and emissions. The system also provides the capability to protect the engine from serious damage resulting from extreme operating conditions, such as high engine temperatures or low oil pressure.
EMDEC equipped engines utilize an electronic fuel injection (EUI) system which replaces the Mechanical unit injection system. An EUI Engine equipped with EMDEC is capable of improved fuel economy and a reduction in certain type of exhaust emissions due to the real time feedback and immediate computer response to the fluctuating parameters of an operating engine.
This is made possible by the system’s ability to sense changes in engine or ambient conditions and adjust fuel delivery rates and injection timing to compensate.
This electronically-controlled fuel delivery system is currently installed in EMD 710 G3BES engine. With EMDEC controlled engines, the quantity of fuel injected by the Electronic Unit Injector (EUI) is determined by its integral solenoid operated poppet valve which is
controlled by the master Electronic Control Module (ECM).
The EUI’s perform the same functions as the previous system’s mechanical unit injectors (MUI’s). They meter, time, pressurize and atomize the fuel. However, the functions performed by the governor have been taken over by the Engine. Control Modules (ECM’s). The lay shaft and injector racks have been replaced by a wiring harness. The helix and barrel assembly of the MUI has been replaced by a solenoid, and hollow poppet valve located on the new injector.
Currently there is one type of EUI available for all 710 engine applications. Fuel flows from the flexible jumper line to the EUI, entering through its inlet filter located in the body of the injector. An internals passage directs fuel to the control portion of the injector, filling the armature chamber below the “E” coil stator. The flow of fuel through the armature chamber cools the stator and armature, also providing lubrication for components. From this chamber, fuel is allowed to flow through a passage in the body of the injector to the lower fuel
chamber.
An additional flow of fuel to the lower chamber is through a passage to the hollow center of the poppet valve. Fuel flows through the valve into the lower fuel chamber to provide cooling of the valve. As the fuel enters the lower chamber, the flows splits, with most of the fuel leaving the injector through the return passage to the return fuel jumper line. From there it travels through the return system to the fuel tank.
If the injector is de-energized, the poppet valve is open allowing fuel to flow upwards around it. This fuel travels into a drilled passageway to fill the high pressure pump chamber below the plunger
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