Electronically controlled unit injector

An Electronically-controlled Unit Injector (EUI) is a Unit Injector with electronic control. It performs the same function as a conventional unit injector in an internal combustion engine, such as in a diesel-electric locomotive. The pressurized delivery of fuel is camshaft driven but the "fill" and "dump" operations are controlled by the engine control unit so as to achieve certain advantages.

Advantages

• Minimum emissions, possibly at the expense of slightly increased fuel consumption
• Minimum fuel consumption, possibly at the expense of slightly increased emissions

Construction

Central to the EUI is the built-in pump, which, as before EUI, allows for low-pressure fuel delivery and return to all injectors, yet provides exceptionally high pressure and concomitant injection and atomization of the fuel to the cylinder during the engine's power cycle.

Users

This system is employed primarily on Electro-Motive Diesel (EMD) locomotive, marine and stationary engines, and primarily on the EMD 710 family of diesel engines.