COMMON RAIL DIRECT INJECTION SYSTEM PDF
The aim of this presentation is to give a generic technical overview of the main features and operating principles of the common rail diesel fuel injection system. Most modern engine's fuel systems use an advanced technology known as CRDi or Common Rail Direct Injection. Both petrol end diesel engines use a common 'fuel-rail' which supplies the fuel to injectors. However, in diesel engines, manufacturers refer to this technology as CRDi. Pioneer of the common rail fuel injection system. The emissions regulations for diesel engines in applications such as ships, trains and heavy- duty off-road.
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Overall System Requirements for Advanced Common Rail. • BOSCH 4th Gen Common Rail Injection Systems. • Potential Evaluation of 4th Gen Common . sophisticated closed loop fuel metering control. ⇨ innovative, delivery controlled high. Common Rail Direct Injection Mode of CI Engine Operation with Different Injection Strategies - A Method to Reduce Smoke and NOx Emissions. Common-rail direct fuel injection is a direct fuel injection system for diesel engines. On diesel .. Print/export. Create a book · Download as PDF · Printable version.
Even a minimal size or shape fluctuation could lead to failures. Defining the right parameters in the design phase is essential, but what really matters is strictly following them during the manufacturing process.
Good mechanical properties ensure strength and prevent corrosion. The used materials are usually steel and stainless steel. The common rail for diesel engine is made of steel, while the common rail for gasoline engine is made of stainless steel, because the fuel is too corrosive and stainless steel possesses better resistance to corrosion than steel. The quality of the common rail is of critical importance. Damage can lead to breakages and leakages, which can block the vehicle or set it on fire.
Therefore anticipating, and preventing any possible common rail problems during manufacturing are essential.
The term "common rail" refers to the fact that all of the fuel injectors are supplied by a common fuel rail which is nothing more than a pressure accumulator where the fuel is stored at high pressure.
This accumulator supplies multiple fuel injectors with high-pressure fuel. This simplifies the purpose of the high-pressure pump in that it only needs to maintain a target pressure either mechanically or electronically controlled.
The fuel injectors are typically ECU-controlled. When the fuel injectors are electrically activated, a hydraulic valve consisting of a nozzle and plunger is mechanically or hydraulically opened and fuel is sprayed into the cylinders at the desired pressure.
Since the fuel pressure energy is stored remotely and the injectors are electrically actuated, the injection pressure at the start and end of injection is very near the pressure in the accumulator rail , thus producing a square injection rate. If the accumulator, pump, and plumbing are sized properly, the injection pressure and rate will be the same for each of the multiple injection events.
From Wikipedia, the free encyclopedia. For other uses, see Common rail disambiguation. For other uses, see DCI disambiguation.
Archived from the original on Retrieved Lyle Diesels for the First Stealth Weapon. Carnot Press.
World's No. Retrieved 16 May Automotive engine. Part of the Automobile series. Air filter Blowoff valve Boost controller Butterfly valve Centrifugal-type supercharger Cold air intake Dump valve Electronic throttle control Forced induction Inlet manifold Intake Intercooler Manifold vacuum Naturally aspirated engine Ram-air intake Scroll-type supercharger Short ram air intake Supercharger Throttle Throttle body Turbocharger Twin-turbo Variable-geometry turbocharger Variable-length intake manifold Warm air intake.
Automobile emissions control Catalytic converter Diesel particulate filter Exhaust manifold Glasspack Muffler. Portal Category. This is an important advantage of common-rail injection over conventional fuel injection systems as CRDI increases the controllability of the individual injection processes and further refines fuel atomization, saving fuel and reducing emissions.
Whereas ordinary diesel direct fuel-injection systems have to build up pressures a new for each and every injection cycle, the new common rail line engines maintain constant pressure regardless of the injection sequence.
This pressure then remains permanently available throughout the fuel line. The engine's electronic timing regulates injection pressure according to engine speed and load.
The electronic control unit ECU modifies injection pressure precisely and as needed, based on data obtained from sensors on the cam and crankshafts. In other words, compression and injection occur independently of each other. This technique allows fuel to be injected as needed, saving fuel and lowering emissions. Krunal P. Mudafale, Sandip V.
Common Rail Direct Injection – What is CRDi Technology?
Lutade, Ganeshgir D. More accurately measured and timed mixture spray in the combustion chamber significantly reducing unburned fuel gives CRDI the potential to meet future emission guidelines such as Euro V.
Common Rail Direct Injection Features: Common rail refers to the single fuel injection line on the CRDI engines. Whereas conventional direct injection diesel engines must repeatedly generate fuel pressure for each injection, in CRDI engines the pressure is built up independently of the injection sequence and remains permanently available in the fuel line. In the CRDI system developed jointly by Mercedes-Benz and Bosch, the electronic engine management system continually adjusts the peak fuel pressure according to engine speed and throttle position.
Sensor data from the camshaft and crankshaft provide the foundation for the electronic control unit to adapt the injection pressure precisely to demand.
Without being introduced to an antechamber the fuel is supplied directly to a common rail from where it is injected Krunal P.
There is no glow plug since the injection pressure is high. The fact that there is no glow plug lowers the maintenance costs and the fuel consumption.
Compared with petrol, diesel is the lower quality fuel from petroleum family. Diesel particles are larger and heavier than petrol, thus more difficult to pulverize.
Imperfect pulverization leads to more unburned particles, hence more pollutant, lower fuel efficiency and less power.
Common-rail technology is intended to improve the pulverization process.
To improve pulverization, the fuel must be injected at a very high pressure, so high that normal fuel injectors cannot achieve it. In common-rail system; the fuel pressure is implemented by a very strong pump instead of fuel injectors. The high-pressure fuel is fed to individual fuel injectors via a common rigid pipe hence the name of "common-rail".
In the current first generation design, the pipe withstands pressures as high as 1, bar or 20, psi. Fuel always remains under such pressure even in stand-by state. Therefore whenever the injector which acts as a valve rather than a pressure generator opens, the high-pressure fuel can be injected into combustion chamber quickly.
Common Rail Fuel Injection
As a result, not only pulverization is improved by the higher fuel pressure, but the duration of fuel injection can be shortened and the timing can be more precisely controlled.In short, "post-combustion" cuts pollutants.
But at low speeds it is almost impossible to burn the fuel completely.
Conventional direct injection diesel engines must repeatedly generate fuel pressure for each injection. The electronic control unit ECU modifies injection pressure precisely and as needed, based on data obtained from sensors on the cam and crankshafts. Air filter Blowoff valve Boost controller Butterfly valve Centrifugal-type supercharger Cold air intake Dump valve Electronic throttle control Forced induction Inlet manifold Intake Intercooler Manifold vacuum Naturally aspirated engine Ram-air intake Scroll-type supercharger Short ram air intake Supercharger Throttle Throttle body Turbocharger Twin-turbo Variable-geometry turbocharger Variable-length intake manifold Warm air intake.