How does electronic unit injector work?

An electronic unit injector system is installed directly into a cylinder head over every combustion chamber. An engine camshaft drives the injector typically through the rocker lever, resulting in an efficient mechanical and hydraulic fuel system that can minimize parasitic losses.

What is a unit fuel injector?

A unit injector (UI) is a high pressure integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component. In a unit injector, the device is usually lubricated and cooled by the fuel itself.

What is a CP4 injection pump?

Fuel injection pumps are used to pump diesel fuel into a diesel engine’s internal combustion chamber. The CP4 pump creates higher pressure with less volume, thereby being a more efficient pump than its predecessor.

What is electronic unit injection?

An electronically controlled unit injector (EUI) is a unit injector (UI) with electronic control. It performs the same function as a conventional unit injector in an internal combustion engine, such as in an on-road or off-road vehicle or a diesel-electric locomotive.

How does the injector make high pressure?

If the spill control valve is closed before the needle control valve is opened, then fuel pressure can be raised to a much higher value before the needle control valve is opened to allow the nozzle needle to open. This provides a means of substantially increasing the pressure during injection.

How many types of unit injectors are used?

For passenger cars, there are two types of unit injector (UI-1, UI-2), which – while having an identical function – differ in size. In a 2-valve engine, the UI-1 is secured using a clamping block at an angle of ap- prox.

Where does a high pressure fuel injector deliver fuel?

Explanation: Most diesel engines use a high-pressure fuel-injector system that will deliver pressurised fuel directly into the combustion chamber of the engine. This system is known as a direct-injection engine.

What do you mean by electronic fuel injection system?

What is Electronic Fuel Injection System (EFI) A system which aims at optimizing fuel/air ratio entering a vehicles engine is referred as Electronic Fuel Injection System. EFI System has almost completely replaced usage of carburetors.

Why is a plunger pump used in a unit injector?

The plunger pump used is usually driven by a shared camshaft. In a unit injector, the device is usually lubricated and cooled by the fuel itself. High pressure injection delivers power and fuel consumption benefits over earlier lower pressure fuel injection, by injecting fuel as a larger number of smaller droplets,…

How does a unit injector work in a diesel engine?

Unit injector. A Unit injector (UI) is a high pressure integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component. The plunger pump used is usually driven by a shared camshaft. In a unit injector, the device is usually lubricated and cooled by the fuel itself.

How does a high pressure fuel pump work?

The key to direct injection is a high-pressure fuel pump. This pump is precision-machined to generate fuel pressure to the rail up to 2,500 psi. These high-pressure fuel pumps are typically driven by a camshaft and are able to vary their displacement and output to match the needs of the engine.

Who are the manufacturers of electronic fuel injection?

In 1995, Electro-Motive Diesel converted its 710 diesel engines to electronic fuel injection, using an EUI which replaces the UI. Today, major manufacturers include Robert Bosch GmbH, CAT, Cummins, Delphi, Detroit Diesel, Electro-Motive Diesel.