Electronic Unit Injector Fuel System

The unit injector system UIS is a nozzle. An electronic unit injector system is installed directly into a cylinder head over every combustion chamber.

Unit Injector Fuel Injection Combustion Engine Engine Control Unit

A type of electronic fuel injection system that uses a single injector or pair of injectors mounted in a centrally located throttle body.

Electronic unit injector fuel system. Unlike other cam boxes the RTF25040 can accept a wide variety of unit injectors and unit pumps with its unique injector block design. Sensors are installed in numerous points of the engine and their function is to send out information to the ECU. Fuel is sprayed directly into the throttle bores by the injectors.

Another advantage is the system. It is the same purpose as the carburettor choke. Electronic unit injectors are mechanically pressurized using electronic control of governing timing and metering functions.

The spring-loaded plunger and barrel assembly to pressurize fuel inside the injector. Fuel is supplied to the injector supply passage by a low pressure transfer pump generally belt-driven from the engine. The HEUI injector serves four functions.

Because the injectors are both injector and pump in one part the individual components themselves are slightly more complicated. The injectors are connected to the electronic control unit through a wiring harness. Hydraulic Electronic Unit Injector HEUI C7 and C9 - Components.

Unit injectors have been both electronic and mechanical depending on the engine type. 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new form of unit injector called the electronic unit injector in which the traditional P-L-N pumping element design has been replaced by a plain plunger and a high speed electromagnetically solenoid operated spill valve.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 HEUI injector functions as an atomizer by pumping high-pressure fuel through orifice holes in the unit injector tip.

It is an extra injector that sprays fuel into the centre of the engine intake manifold to start the engine easily. The HEUI fuel system is completely free of adjustment. Proper filters and strainers are required to protect the injectors.

Conventional Fuel Supply Systems in diesel engines require high-pressure lines to deliver the pressurised fuel into the injectors. Fuel droplet sizes are smaller for enhanced emissions and this finer atomization enables EGR flow tolerance into combustion. In a unit injector system the fuel is not kept at a constant high pressure before entering the injectors.

The Electronic Control Unit is responsible for the measurement of the sensors and the. 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. The unit pump injection system UPS injects the fuel into the engine cylinder.

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. Diagnostic tests on Common Rail fuel systems. 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 throttle unit resembles a carburetor except that there is no fuel bowl float or metering jets. It consists of an electronically controlled unit pump and a nozzle holder assembly connected via a precisely adapted high-pressure line. Architecture of Electronic Fuel Injection System Sensors.

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. Transferring fuel through. The HEUI injector pressurizes supply fuel from 450 kPa 65 psi to 175 MPa 25382 psi.

This helps the engine to start. The electronic fuel injection system has a cold start injector too. Adjustments to the components that are mechanical can not be made.

A poppet valve known also as a spill control valve or solenoid needle valve that. A unit injector consists of several basic elements. 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.

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