Electronic Unit Injector Fuel System

Unit injectors have been both electronic and mechanical depending on the engine type. Fuel droplet sizes are smaller for enhanced emissions and this finer atomization enables EGR flow tolerance into combustion.

Pin On Common Rail Injector

Conventional Fuel Supply Systems in diesel engines require high-pressure lines to deliver the pressurised fuel into the injectors.

Electronic unit injector fuel system. It consists of an electronically controlled unit pump and a nozzle holder assembly connected via a precisely adapted high-pressure line. Sensors are installed in numerous points of the engine and their function is to send out information to the ECU. A type of electronic fuel injection system that uses a single injector or pair of injectors mounted in a centrally located throttle body.

The unit injector system UIS is a nozzle. A poppet valve known also as a spill control valve or solenoid needle valve that. It is an extra injector that sprays fuel into the centre of the engine intake manifold to start the engine easily.

Hydraulic Electronic Unit Injector HEUI C7 and C9 - Components. In a unit injector system the fuel is not kept at a constant high pressure before entering the injectors. Fuel is sprayed directly into the throttle bores by the injectors.

It is the same purpose as the carburettor choke. Another advantage is the system. Unlike other cam boxes the RTF25040 can accept a wide variety of unit injectors and unit pumps with its unique injector block design.

Electronic control unit sendselectric signal to electro-valve A solenoid electric valve allowsfuel to pass to injector nozzle -Injection made in typical wayalready explained In figure the injection pumpand the injector are a same unit. Architecture of Electronic Fuel Injection System Sensors. The HEUI injector functions as an atomizer by pumping high-pressure fuel through orifice holes in the unit injector tip.

The HEUI injector pressurizes supply fuel from 450 kPa 65 psi to 175 MPa 25382 psi. The Electronic Control Unit is responsible for the measurement of the sensors and the. The fuel is supplied to the injector through a passage in the cylinder head and excess fuel is returned from the injector to the fuel supply system through another passage also in the cylinder head.

The unit pump injection system UPS injects the fuel into the engine cylinder. The HEUI injector serves four functions. When joined with the RTF25040 Cam Box the system can perform a full range of tests on most Electronic Unit Injectors as well as Electronic Unit Pumps.

A unit injector consists of several basic elements. Adjustments to the components that are mechanical can not be made. Proper filters and strainers are required to protect the injectors.

Diagnostic tests on Common Rail fuel systems. Fuel is supplied to the injector supply passage by a low pressure transfer pump generally belt-driven from the engine. Because the injectors are both injector and pump in one part the individual components themselves are slightly more complicated.

The throttle unit resembles a carburetor except that there is no fuel bowl float or metering jets. Electronic unit injectors are mechanically pressurized using electronic control of governing timing and metering functions. The injectors are connected to the electronic control unit through a wiring harness.

The HEUI fuel system is completely free of adjustment. This helps the engine to start. The electronic fuel injection system has a cold start injector too.

An electronic unit injector system is installed directly into a cylinder head over every combustion chamber. Electronic Unit Injector The requirement for more flexible control of injection parameters gave rise to a new form of unit injector called the electronic unit injector in which the traditional P-L-N pumping element design has been replaced by a plain plunger and a high speed electromagnetically solenoid operated spill valve. The operation of the Hydraulic Electronic Unit Injector HEUI fuel system is completely different from any other type of fuel system that is actuated mechanically.

Transferring fuel through. The spring-loaded plunger and barrel assembly to pressurize fuel inside the injector. 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.

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