Bosch is the worlds largest manufacturer of injectors, supplying some 70 automakers worldwide with its systems. The following table is a guide to the fuel paths marked by each blue arrow in figure 6. Fuel injection systems after the gasoline travel all the way from the tank, passing all the equipment before, it is deliver to the equipment that is responsible from mixing the fuel whit the air, and supplying the fuel to the engine. This diagram was adapted from the porsche 912e workshop manual and has been enhanced to provide additional information to assist in isolating fuel injection problems. In 2012, roughly 60 percent of all newly manufactured vehicles featured gasoline portfuel injection. Understanding djetronic fuel injection an overview of bosch djetronic in jaguar v12s 19751980 an overview of bosch djetronic as used in jaguar v12s from 1975 to 1980. Today, it has been superseded by gasoline injection. This video is the working principle animation of electronic fuel injection system. Fuel injection system an overview sciencedirect topics.
Ljetronic, which is an electronically controlled fuel injection system, is particularly suitable for the above mentioned conditions. Vw ljetronic fuel injection workshop manual created date. Tbi systems were used in the late 1980s and early 1990s. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more. The following characteristics of an injection system are desirable in achieving these goals. The diesel engine is known as a compressionignition engine, while the gasoline engine is a sparkignition engine. Bosch gasoline fuel injection from the year 1954 12 15. A free powerpoint ppt presentation displayed as a flash slide show on id. 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. Automotive electrics and electronics, gasoline and diesel fuelinjection systems, brake. Bosch ljetronic fuel injection guide fiat fuel injected. All information, illustrations and specifications contained in this manual are based on the latest product information available at the time of publication approval. 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.
These fuel injection systems were considered to be really reliable and trustworthy. Page 20 ljetronic system diagram the next diagram is a schematic drawing of the complete ljetronics fuel injection system. Bosch licensed the concept to many automobile manufacturers. If in doubt, spray break cleaner on pipes, hoses, injectors, intake manifold and map sensor. The right is reserved to make changes at any time without notice. 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. Advanced diesel electronic fuel injection and turbocharging. Med motronic case study fuel injection vehicles free. See pages 286292 for important safety, emissions and warranty information. Ljetronic, lhjetronic, and motronicasanintegratedenginemanagement system. The system pressure of the kjetronic can not be reduced like an efi system when cleaning with our lb2912f flow meter.
Fuel injection systems have a significant influence on the combustion process and hence a key role to play in improving engine fuel consumption and reducing noxious exhaust emissions. Electronic luellnjectlon systems the l jetronic aod ils variants are electro. Fiis a fuel injection system for sm all displacem ent m otorcycle, and this system is not a simplified but a full functional system, as well as it of large displacement motorcycle. It gives the clear idea about how to work a fuel injection system. Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Approximately up until 1994 mechanical fuel injection systems have been installed on certain mercedes, audi, volkswagen, ford etc. Vw ljetronic fuel injection workshop manual author. Bosch ljetronic system on the fiat 1500cc engine how ljetronic works this basic operation is achievable without an electronic fuel injection system. Pdf gasoline engine management systems and components. Med motronic case study free download as powerpoint presentation. Testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration.
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. An engines operating conditions keep changing rapidly, hence fuel injection system should be fast enough to adhere to the changes and vary the fuel supply quantity at that very moment. Multi port fuel injection delivers a more evenly distributed mixture of air and fuel to each of the engines. Ecu can detect various states of engine by various sensors and control the optim al volum e of fuel. 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. The average system pressure on all kjetronic fuel systems should be 520 kpa. You should understand this fuel injection system before you begin working on the vehicle. Gasoline fuel injection system ljetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your. When the f uel oil enters the cylinder, it will ignite because of the high temperatures. L jetronic, lhjetronic, and motronicasanintegratedenginemanagement system. The bosch technical instruction booklet vdt ubp 7511b explains the ljetronic system in detail andwill increaseyour understanding of this system this will reduce repair times and facilitate the use of this. Bosch l jetronic system on the fiat 1500cc engine how l jetronic works this basic operation is achievable without an electronic fuel injection system. While new carburated engines were used in the european markets, vw adapted the ljetronic for the type 4 in the us due to more stringent emissions and fuel consumption regulations.
The abcs of carburetion click here now bosch electronically controlled gasoline fuelinjection system with lambda closedloop control kejetronic. Chapter of djetronic articles by drdjet describes systematic fault finding troubleshooting and repair on your bosch fuel injection system. Fuel injection basics car obd diagnostics, ecu chip. There are several variations of the technology offering technological development and refinement.
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. What an electronic system offers is precise control over fuel delivery and air flow. Idle switch is used for coasting fuelcutoff on later modelse12 7981. 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. These early motronic systems integrated the spark timing element with thenexisting jetronic fuel injection technology. Gasoline fuel injection system l jetronic bosch pdf download this manual may contain attachments and optional equipment that are not available in your. Ppt gasoline direct injection powerpoint presentation.
Gasoline fuel injection system ljetronic bosch pdf. So, technically, the engine only needs a 19 lbhr fuel injector to support 300 hp, but this will require that the injector is at nearly a 100% duty cycle in. This page was last edited on 30 novemberat sequential fuel injection and knock control. Kjetronic fuel injection system kjetronic is a mechanically and hydraulically operated fuel injection pump, introduced by bosch gmbh in the year 1973. Combustion in the gasoline engine the sparkignition or ottocycle engine 2 gasoline engine management technical requirements 4 cylinder charge 5 mixture formation 7 ignition function and requirements 10 inductive ignition systems gasoline injection systems overview 16 mmotronic engine management mmotronic. Online library bosch l jetronic fuel injection free manual bosch l jetronic fuel injection free manual bosch l jetronic fuel injection 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. 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. Bosch digifant engine management system jetronic motronic. A servojet electronic fuel injection system was designed and manufactured for the cummins vta903 engine. Bosch superseded the djetronic system with the kjetronic and ljetronic systems for 1974, though. After the more desirable products have been refined, residual fuel can be combined or diluted with a lighter fuel to produce a mixture that can. A throttle body injection tbi system has a single throttle body which contains one or two fuel injectors. L jetronic system throttle and idle control n throttle opens to allow more air to sucked in to engine n small amount of air bypasses the throttle so the engine gets air and will idle.
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