The primary pressure regulator that is installed in the fuel distributor housing maintains a constant pressure in the fuel system of the kjetronic. Between the years 1973 and 1995, the highly reliable, mechanical multipoint injection system kjetronic was installed as original equipment in seriesproduction vehicles. Gasoline direct injection key technology for greater. Vw ljetronic fuel injection workshop manual created date. Diesel distributor fuelinjection pumps technical instruction. Gasoline direct injection introduced by bosch in 1937 on engines. The following table is a guide to the fuel paths marked by each blue arrow in figure 6.
Pilot injection of common rail fuel injection system. Until about 1970 it was both rare and expensive, restricted to some aircraft applications. Bosch is the worlds leading supplier of diesel fuel injection systems and is standard equipment on many diesel engines today. The injection pump is an inline, plunger type, with an individual plunger and barrel pumping element for each engine cylinder. Pdf electronic fuel injection system electronic fuel. The bosch fuel injector has a return rate of 1 part per million ppm, making bosch the industry. Gasoline injection systems by bosch were already used in 1954 in the legendary mercedes benz 300. The bosch fuel injector has a return rate of 1 part per million ppm, making bosch the industry benchmark. Pdf diagnosing methods common rail fuel injectors researchgate. Many of them use a fuel pump essentially identical to the carbureted fuel systems. The system is designed to optimize the performance. Although gasoline fuel injection fi has been around just about as long as the automobile itself, it has always been a mysterious technology. Primarypressure regulator, kjetronic bosch classic. Today, it has been superseded by gasoline injection systems which thanks to.
Fuel delivery system certain mechanical fuel injection systems also utilize a mechanical fuel pump, typically some early gasoline fuel injection systems. The highpressure pump delivers fuel at high pressure to the connected. This costeffective systems approach can reduce fuel consumption by as much. Advanced diesel common rail injection system for future.
Bosch genuine oe injectors provide superior performance and durability and are manufactured to original equipment specifications. Excellent background information on various bosch fuel injection and engine management systems. Fuel injection systems diesel ruimanuelvieirapinto 1090039 sistemas automoveis anolectivo20092010 fuel injectionsystems diesel sistemas automoveis anolectivo20092010 1 basic diesel fuel systems 2 injection pumps 3 injectors 4 inline injection pump 5 radial rotary injection pump 6 electronic injection systems 7 bibliography. The triedandtested technology still features a high potential for the further reduction of fuel consumption and emissions. An auxiliary air valve, cold start injector and thermotime switch aid in cold starting and operation. Bosch port fuel injectors pfi have a robust design and are capable of using ethanol fuel e100. In bosch enginemanagement systems featuring electronic throttle control etc, the cylindercharge control subsystem determines the required inductionair. Boschs range of components for flex fuel drive systems is supplemented by the flexstart system solution and flex fuel technology with gasoline direct injection. Fuel system figure 5 is a simplified drawing of the fuel system. Vw ljetronic fuel injection workshop manual author. Gasoline direct injection key technology for greater efficiency and.
The system supports sequential fuel injection and waste spark ignition. The bosch ljetronic fuel injection system used in the porsche 912e is often referred to as the air flow controlled or afc fuel injection system. Bosch has developed four individual approaches to improving gasoline portfuel injection. Jegs has a large selection of high performance and replacement fuel injection parts to increase horsepower or just get you back on the road.
Today we provide technology for fuel supply, fuel injection, air management, ignition, engine control, and exhaustgas treatment as well as endtoend solutions for this drive system. The injection pumps bearings, camshaft and tappets are lubricated with oil from the engines lubricating system the pump elements are lubricated by the fuel. By using piezo injectors, bosch increases the system pressure of commonrail systems to. Pdf diesel distributor fuelinjection pumps technical. A fuelinjection pump, a mechanical flyweight or electronic. 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. Doc diesel oxidation catalyst similar to the petrol version in. Ci engine, common rail system, fuel injector, high and low pressure. Advanced diesel common rail injection system for future emission legislation roger busch. Bosch inline and distributor injection pumps have played, and continue to play, a major role in. Bosch launched gasoline direct injection in 1951 and has remained at the cutting edge of the technology ever since. Mechanical fuel injection bosch kjetronic, bosch k jetronic fig. Bosch has developed a system approach that elimi nates the turbo lag.
Testing gas fuel injectors early bosch mfi fuel injection part 4 w kent bergsma duration. Originally, volkswagen adapted the ljetronic for the type 4 air cooled 411 engines sold in the united states due to more. In 2012 bosch had already produced five times as many high pressure injection valves and pumps as in 2010. Commonrail injection systems crs327 diesel commonrail. Commonrail injection systems bosch mobility solutions. Excess fuel from the regulator returns to the fuel tank. Since the electric fuel pump supplies more fuel that is used by the engine, a valve in the pressure regulator opens and returns this excess fuel to the fuel tank. The preheat, starting and postglow phases of a glow plugs operation affect not only the startup function, but the vehicles overall performance as well.
The robert bosch model pes 6mw injection pump is used on the international dt466c diesel engine. Some, however, use a vane type fuel pump mounted directly to the injection pumpfuel distributor assembly. Bosch cis fuel injection age related issues with kent bergsma duration. A pressure regulator on the return line maintains fuel pressure at 28 psi. In the program, the injection pump was replaced with the measured pressure at the junction between the pump and highpressure pipe. It stores the compressed fuel and supplies this to the injectors. Pfi port fuel injection bosch port fuel injectors pfi have a robust design and are capable of using ethanol fuel e100. Please consult your local distributor for those items you may require. 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. Bosch kjetronic continuous injection system mechanical fuel injection overview 15. Reading only the title, the reader may conclude that the concepts expressed are limited to bosch systems, however, many other automotive fuel and engine management systems. With a long history of diesel fuel injection expertise and innovation, bosch engineers manufacture glow plugs to withstand.
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. Another excellent source of general info on the bosch injection system from the early djetronic electronic to kjetronic mechanical constant injection all the way to the later variations of the motronic engine management with lambda exhaust sensing to allow the system to function closedloop, is the book. Figure 3 presents electromagnetic bosch fuel injector. The fuel pump draws fuel from the frontmounted fuel tank through a filter and delivers it to 4 injectors. Bosch ke jetronic manual bosch kjetronic service manual bosch ke jetronic workshop manual bosch k jetronic manual mercedes bosch d jetronic fuel injection manual manual kjetronic l jetronic le jetronic kjetronic kjetronic deutsch kjetronic german bosch fsa 740 using manual bosch manual she bosch manual bosch gourmet 872. Bosch glow plugs are critical for starting up a diesel engine. A thorough understanding of the various components is required before working on kjetronic fuel systems. Egtexhaust gas treatment fie fuel injection equipment. Not a direct diagnostic tool, but an excellent volume on theoretical aspects. Until about 1970 it was both rare and expensive, restricted to some aircraft applications, and to a handfull of exotic, high performance cars and racers. The used side channel pump is the first fuel pump made. The exceptionally fast switching highpressure injection valves with piezo technology, the development of which won the german future prize.
The fuel is injected directly into the combustion chamber using highpressure injectors. All bosch fuel injectors released to the aftermarket are oe fit, form and function, and are produced to oe specifications. This paper describes advanced electronic fuel injection system for small 4stroke vehicles. So literally in the blink of an eye 400 milliseconds, a single bosch gdi injector injects fuel 20 times.
The bosch filters produced with high technical effort reliably protect engine components against dirt particles and abrasion. Aem, accel, bbk, edelbrock, fast, fitech, ford racing. Fuel under high pressure passes along injector pipes. Overview of the bosch diesel fuelinjection systems m, mw, a, p, zwm, cw inline injection pumps in order of increasing size. Diesel commonrail system crs 225 with solenoid valve injectors for up to 2,500 bar.
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