basis for a generic common rail diesel course which is now undergoing development and operating principles of the common rail diesel fuel injection system. for Future Emission Legislation. Roger Busch. Common Rail System Engineering for PC. Diesel Systems. Robert Bosch GmbH. 10th Diesel Emission Reduction. MAN Diesel & Turbo's common rail tech- nology (CR) severs this link in medium speed four-stroke engines. CR permits continuous and load-independ ent con-.
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THE COMMON RAIL SYSTEM. II. CONTROL STRATEGIES. III. ABBREVIATIONS. IV. Produced and published by: Delphi France SAS. Diesel Aftermarket. Alternative fuel that replaces diesel and at the same time that result in . to power CI engine operated in common rail direct injection (CRDI). CRS diesel common-rail system with piezo injectors and 2, bar. HFR high-pressure rail. CP/2 high-pressure pump. MDG1 electronic engine.
For the first time, this technology was used on heavy vehicles and later adapted to automobiles and passed mass production. Through this line, fuel sent into the cylinders.
In conventional diesel engines the pressure needs to be readjusted for each injection process, while in CRDI the pressure is always constant and this pressure remains constant along the fuel line.
The ECU adjusts the injection timing of the injectors depending on the engine load and speed. The amount of fuel to be delivered to the combustion chamber is set by the ECU with the information which is provided by the sensors in the engine. Fuel is supplied to the combustion chamber when it is needed, fuel is not sent to the combustion chamber when it is not needed.
This saves fuel and reduces emissions. Figure 1. Features of CRDI Technology The emission problem has always been a problem for ships, trains, heavy duty vehicles, generators and other vehicles with diesel engines.
Another important problem was that customers were constantly looking for economical engines with lower fuel consumption. The emission problem was solved by diesel particle filters and catalytic converters, but this time, these systems were causing problems with the large space requirements. To cope with these problems a few changes had to be made in the diesel engines.
Because of this, the engineers decided to develop an internal combustion diesel engine. The NOx level also decreases when fuel is completely burn. But at low speeds it is almost impossible to burn the fuel completely.
To achieve this, multiple injection was developed.
In first stage, pilot injection occurs immediately before the ignition. It allows fuel and air to mix properly.
In second stage, Pre-injection occurs and it is reducing ignition delay before main injection. NOx level, noise and vibration are reduced at this stage. The heat generated by the pre-injection is much higher than the heat required for the fuel itself to ignite.
In this case, when the main injection takes place as third stage the yield from the fuel becomes higher. In fourth stage, after-injection takes place and unburned fuel is burned. Finally, post-injection helps the generate heat which is required by the catalytic converter. In this way, the catalytic converter works more efficiently. Figure 2. By the way, a net importer of crude oil like Thailand, still needs energy security policies to reduce the dependency on imported oil.
Thus, Thailand has announced the B3. Basha et al. Chauhan et al.
Sharon et al. Palash et al. An et al. The reduction in CO2 and HC has been observed. Harch et al. Kuti et al. Mohan et al. While these older systems provide accurate fuel quantity and injection timing control, they are limited by several factors:. 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.