Petrol engines can use gasoline direct injection, where the fuel is directly delivered into the combustion chamber, or indirect injection where the fuel is mixed with air before the intake stroke. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Our folks have several options from basic to completely trick. The mechanical fuel injection system has recently been overshadowed by modern electronic injection, which enables the use of lambda closed loop control. An air flow meter, located in the air intake chamber, converts angular movement of an air baffle plate into a voltage signal, which is sent to the control unit. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though. Ljetronic established the principle of calculating the fuel quantity r equired and thus the pulse time of the injectors the basis of airflow sequential fuel injection sfi. Feb 12, 2019 bosch digifant engine management system jetronic motronic. The l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle l jetronic fuel injection system. Ljetronic system fuel flow n fuel is pumped up to fuel rail and excess returned to tank n because so much fuel is circulated, filter is quite large. K jetronic system overview the k jetronic is a mechanically and hydraulically controlled fuel injection system which needs no form of drive and which meters the fuel as a function of the intake air quantity and injects it continuously onto the engine intake valves. Kjetronic is different from pulsed injection systems in that the fuel flows. A4 ignition and gasoline injection systems from bosch ignition and gasoline injection systems from bosch more than a century of system expertise l jetronic components ke jetronic components motronic components renowned vehicle manufacturers rely on bosch as original equipment supplier and thus form the basis for a fruitful replacement.
Download gasoline fuelinjection system ljetronic technical. Gasoline fuel injection system ljetronic bosch pdf. Pdf electronic fuel injection system electronic fuel. The bosch djetronic electronic fuel injection system is composed of 3 major. A closedloop catalyst reduces emission of hydrocarbons, nitrogen oxides and carbon. Direct petrol injection system with bosch motronic med 7. Before troubleshooting, testing or adjusting the kjetronic fuel injection system, the ignition system and the mechanical system of the engine compression, valve timing, etc. Feb 20, 2016 testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration. An engine out of adjustment can cause excessive exhaust smoke, poor fuel economy, heavy carbon buildup within the combustion chambers, and short engine life. The average system pressure on all k jetronic fuel systems should be 520 kpa. Pdf gasoline engine management systems and components. Apr 14, 2016 pdf gasoline fuelinjection system ljetronic. Bosch l jetronic fuel injection troubleshooting, maintenance. Nissan offered electronic, multiport fuel injection in 1975 with the bosch l jetronic system used in the nissan l28e engine and installed in the nissan fairlady z, nissan cedric, and the nissan gloria.
In 2012, roughly 60 percent of all newly manufactured vehicles featured gasoline port fuel injection. More clearly stated, this means that if you have a gasoline engine that makes 300 brake horsepower, its total maximum fuel requirement in lbhr can be calculated as follows. This manual is designed to assist the technician unfamiliar with robert bosch fuel injection systems in locating faults in the ljetronic system, isolating the. Choose from larger fuel injectors, fuel rails, fuel injection controllers, mass air meters, bigger throttle bodies, complete fuel injection kits and more from leading fuel injection leaders. Many of them use a fuel pump essentially identical to the carbureted fuel systems. The ljetronic was the first massproduced, fully electronic fuel injection system. Free download free online viewing free printables home all car manuals online how to download pdf for free about us. Examples home mechanical fuel injection volvo owners club. The bosch gasoline injection system presented at the frankfurt motor show in 1951 for the gutbrod superior twostroke engine achieved fuel savings of around 20 percent and raised the vehicle power from 23 to 28 hp. In japan, the toyota celica used electronic, multiport fuel injection in the optional 18re engine in january 1974. Gasoline fuel injection system k jetronic gasoline engine management technical instruction published by. Ljetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant temperature sensor, fuel injectors, and the electronic control unit terminal for the constant idle systems cis if equipped. The only vehicle that runs a higher pressure than this is the porsche turbo carrara models from 1975 to 1979 which have a system pressure of 600 kpa.
All enginerelated changes are recorded by a variety of sensors and processed in the electronic control unit. In gasoline port fuel injection, the air fuel mix is created. Licensing some of boschs ljetronic concepts and technologies, lucas. L jetronic electronic control unit ecu, airflow sensor, system relay, fuel pump relay, lambdasond oxygen sensor, vacuum switch, electric fuel pump, coolant temperature sensor, fuel injectors, and the electronic control unit terminal for the constant idle systems cis if equipped.
This following overview is a brief description of the system. Fuel injection system the ke2 jetronic fuel injection system is fitted to turbocharged engines. Gasoline fuel injection system kejetronic by robert bosch doc. A thorough understanding of the various components is required before working on kjetronic fuel systems. Bosch is the worlds largest manufacturer of injectors, supplying some 70 automakers worldwide with its systems. In this chapter you will learn the major components of the diesel fuel system and how they operate so.
Take a technological leap forward with a new electronic fuel injection system from summit racing. We carry many efi systems many selftuning and selflearningfrom the top players in engine performance, including msd ignition, edelbrock, holley, fast, accel, chevrolet performance, quick fuel, and more. Then, the command unit processes this information received and calculate the appropriate fuel injection time, through an electric signal. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed. Aug 11, 2014 gasoline engine management gasoline fuel injection system k jetronic technical instruction published by. The task of a fuel injection system is to supply precise amount of fuel to the. Diagnostics and spare parts from a single source product.
This paper describes advanced electronic fuel injection system for small 4stroke vehicles. I personally own a vintage porsche 914, and this book really helped me understand what was actually going on behind the scenes of my fuel delivery system. Direct petrol injection system with bosch motronic med 7 design and function. Electronically controlled gasoline fuelinjected system with lambda. Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector all diesel engines use fuel injection by design. Efielectronic fuel injection systems at summit racing. L jetronic, lh jetronic, and motronicasanintegratedenginemanagement system. R02cr e b colqegu couivo\ aglase we guq ph ph ecn le logq coucvtloue eae16uj sqgble 10 cugua vqsblsqou ob6lguua couqguoue guq nuq6l bgl11cr1gl logq. The system pressure of the k jetronic can not be reduced like an efi system when cleaning with our lb2912f flow meter. The latter is the simpler of the 2 systems and controls the fuel rail to a constant pressure via a nonvacuum referenced regulator in the tank, which is typically set to 55 psi.
Aug 20, 20 this video is the working principle animation of electronic fuel injection system. The injection has as function to provide the amount of fuel exactly. Robert bosch gmbh, 2000 postfach 30 02 20, d70442 stuttgart. With retrofit fuel injection systems many times we are drawing fuel from gas tanks that are many years old. Ljetronic fuel injection systems for bmw e12s peter florance. Now let us have a look how bosch ke jetronic fuel injection system can be diagnosed and repaired on an example of audi 100 2. The fuel pump, located in the fuel tank, pumps the fuel through a filter to the single fuel injector. The lejetronic system is electronically commanded and injects the fuel in the intake manifold. Many of them use a fuel pump essentially identical to the carbureted fuel system s. Apr 28, 2016 k jetronic fuel injection system k jetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. There are several variations of the technology offering technological development and refinement. Combining this direct injection theory with electronic sensors, valves. Singlepoint fuel injection singlepoint throttlebody injection tbi fuel injection is the concept behind this electronicallycontrolled injection system in which a centrally located solenoidoperated injection valve mounted upstream from the throttle.
Testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration. These fuel injection systems were considered to be really reliable and trustworthy. Djetronic fuel injection for the porsche 914 page 3 of 10. The ljetronic is an electronically controlled fuel injection system which has the advantage of direct air flow sensing.
The main difference between carburetor and fuel injection system carburetorzfuel is atomized by processes relying on the air speed greater than fuel speed at the fuel nozzle, zthe amount of fuel drawn into the engine depends upon the air velocity in the venturi fuel injection systemzthe fuel speed at the point of delivery is greater than the air speed to atomize the fuel. Domestic carmakers adopted electronic fuel injection extensively on breadandbutter production cars in the early 80s. Chapter of djetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. The electronically modified bosch ke also has this capability although it never achieved the popularity of the pure mechanical system. Bosch k jetronic fuel injection manual pdf document. Kjetronic fuel injection system kjetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. I will discuss the theory of operation, common problems, and then recommend a procedure for renewing the system as a whole.
Fuel air spark technology electronic fuel injection leader. The complete system contains the following components. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though some cars such as the volvo 164 continued. Bosch developed an electronic fuel injection system, called djetronic d for druck, german for pressure, which was first used on the vw 1600tle in 1967. View fuel injection system research papers on academia.
Bosch l jetronic fiat fuel injected engines guide file type. The bosch l jetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Direct petrol injection system with bosch motronic med 7 design and function selfstudy programme 253 service. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations.
Detach the operational relay set from the relay block as well as from the safety appliance located under the steering tube. The l jetronic was the first massproduced, fully electronic fuel injection system. Automotive equipment business sector, department for automotive services, technical publications khpdi2. This is an excellent book containing a detailed description of the ljetronic fuel injection system. Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems.
Gasoline fuel injection system ljetronic bosch pdf download. Fitech fuel injection has been supplying automotive products, specifically fuel injection products, since 2012. This fuel system has been used on lots of automobiles from the 1970s and 1980s. Thisis necessary due to the added complexity and increased power output of the engine, the system provides a higher degree of mixture strength control than that provided by the k jetronic system. The kjetronic pump requires no form of drive and one of its features is that it can meter the fuel as a function of the intake air quantity. All information, illustrations and specifications contained in this manual are based on the latest product.
Some, however, use a vane type fuel pump mounted directly to the injection pump fuel distributor assembly. File type pdf bosch l jetronic fiat fuel injected engines guide file type. Ljetronic the ljetronic is an electronically controlled injection system with airflow metering based on the air vane principle and electromagnetically controlled fuel injection into the intake manifold. Robert bosch gmbh, 2000 postfach 3002 20, d70442 stuttgart. Nov 21, 2009 gasoline injection systems gasoline injection systems carburetors and gasoline injection sys representative examples are the various tems are designed for a single purpose. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel. Chapter of d jetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection systemfehlersuche.
It features a lambda probe aggregated to the injection system, installed in the exhaust pipe. Gasoline fuelinjection system kjetronic fuelinjection. Motronic as an integrated engine manage ment system. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in. The bosch ljetronic fuel injection system is electronically controlled to regulate the fuel supply in relation to the air flow.
Gasoline injection systems overview 10 k jetronic system overview fuel supply 14 fuel metering 18 adapting to operating conditions 24 supplementary functions 30 exhaustgas treatment 32 electrical circuitry 36 workshop testing techniques 38 k jetronic since its introduction, the k jetronic gasoline injection system has pro. The earliest bosch installations were the d jetronic and l jetronic systems, and we can still find their operating principles at work in vehicles for the 2001 model year. Fast is the leading developer of electronic fuel injection systems, efi components, intake manifolds, tuning tools for high performance and street applications fuel air spark technology javascript seems to be disabled in your browser. All the old model vehicle were equipped with carburetor for air fuel mixing and now im going to explain you electronic fuel injection system that has been. Jetronic is a trade name of a fuel injection technology for automotive petrol engines, developed and marketed by robert bosch gmbh from the 1960s onwards.
This manual may contain attachments and optional equipment that are not available in your area. This page was last edited on 30 novemberat sequential fuel injection and knock control. The diesel fuel injection system is a major component of a properly operating engine. It differentiates from the le jetronic for having, in addition to the injection system, also the ignition system incorporated in the command unit.
Preferably unmolested or modified and in working order. This video is the working principle animation of electronic fuel injection system. Originally, volkswagen adapted the l jetronic for the type 4 air cooled 411 engines sold in the united states due to more stringent emissions and fuel consumption regulations. Ljetronic fuel injection system hi fellow fiat enthusiasts, just putting it out there if anyone has or knows where i can get a bosch ljetronic fuel injection air flow meter. Jegs has a large selection of high performance and replacement fuel injection parts to increase horsepower or just get you back on the road. Prior to l jetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. The electric fuel pump installed for a fuel injection system will draw considerable more volume of fuel from your tank than your old system did. The primary objective of engine development is to minimise fuel consumption and exhaust emissions.
The task of a fuel injection system is to supply precise amount of fuel to the combustion chamber at that particular moment. The k jetronic pump requires no form of drive and one of its features is that it can meter the fuel as a function of the intake air quantity. These early motronic systems integrated the spark timing element with thenexisting jetronic fuel injection technology. This article does not cover the l jetronic system used on the 1. Ljetronic, lhjetronic, and motronicasanintegratedenginemanagement system. Aem, accel, bbk, edelbrock, fast, fitech, ford racing. Motronic as an integrated enginemanage ment system. Bosch licensed the concept to many automobile manufacturers. Gasoline engine management gasoline fuel injection system kjetronic technical instruction published by. The ljetronic is an electronically controlled injection system with airflow metering based on. In the le jetronic system, the injection valves spray the fuel simultaneously, what is to say, they are all driven at the same time. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc.
Jan 03, 2016 apakah anda ingin menghapus semua pencarian terakhir. Prior to ljetronic, mechanical fuel injection systems had proven that directly injecting atomized fuel into the cylinder resulted in better engine operation. Vw ljetronic fuel injection workshop manual created date. Electronic luellnjectlon systems the l jetronic aod ils variants are electro nically controlled fuelinjection systems solenoidopersle system is described in t booklet ljetronic in iha bosch technical instruclion series. Today, it has been superseded by gasoline injection. We are leading providers of fuel systems and ultra ram sbc efi. Online gasoline fuel injection system kejetronic by robert bosch ebook pdf download. It gives the clear idea about how to work a fuel injection system. Product information automotive gasoline systems diagnostics and.
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