Guru
Introduction
With the continuous development of the innovation of automotive technology, engineers and manufacturers all the time are in research of more effective and durable private combustion engines. An example of such a breakthrough is the Common Rail Direct Injection (CRDI) system that has revolutionized fuel delivery to the engine. This tissue jum deviates to CRDI, the complexities of which the blog discusses; its integration into manufacturing cars cleaner, more economical, and more powerful,makes it emergent.
CRDi stands for Common Rail Direct Injection meaning, direct injection of the fuel into the cylinders of a diesel engine via a single, common line, called the common rail which is connected to all the fuel injectors.
Whereas ordinary diesel direct fuel-injection systems have to build up pressure anew 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.
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. CRDi engines are now being used in almost all Mercedes-Benz, Toyota, Hyundai, Ford and many other diesel automobiles.
History
The common rail system prototype was developed in the late 1960s by Robert Huber of Switzerland and the technology further developed by Dr.Marco Ganser at the Swiss Federal Institute of Technology in Zurich, later of Ganser-Hydromag AG (est.1995) in Oberägeri. The first successful usage in a production vehicle began in Japan by the mid-1990s. Modern common rail systems, whilst working on the same principle, are governed by an engine control unit (ECU) which opens each injector electronically rather than mechanically. This was extensively prototyped in the 1990s with collaboration between Magnetic Marelli, Centro Ricerche Fiat and Elasis.The first passenger car that used the common rail system was the 1997 model Alfa Romeo 156 2.4 JTD, and later on that same year Mercedes-Benz C 220 CDI.
Common rail engines have been used in marine and locomotive applications for some time. The Cooper-Bessemer GN-8 (circa 1942) is an example of a hydraulically operated common rail diesel engine, also known as a modified common rail. Vickers used common rail systems in submarine engines circa 1916. Early engines had a pair of timing cams, one for ahead running and one for astern. Later engines had two injectors per cylinder, and the final series of constant-pressure turbocharged engines were fitted with four injectors per cylinder.
This system was used for the injection of both diesel oil and heavy fuel oil (600cSt heated to a temperature of approximately 130 °C). The common rail system is suitable for all types of road cars with diesel engines, ranging from city cars such as the Fiat Nuova Panda to executive cars such as the Audi A6.
The Basics of Direct Injection:
It's important to understand the idea of direct injection in general before getting into Common Rail Direct Injection specifics. Fuel is supplied to the engine's combustion chamber through a central location in a conventional fuel injection system, which is usually close to the intake valve. As the name implies, direct injection eliminates the need for the intake port and involves injecting fuel straight into the combustion chamber.
Key Features and Advantages of CRDI:
1. Precision and Control:
CRDI has high-pressure common rail which acts as a reservoir for the fuel which is readily for use. This gives a possibility to accurately control the moment and the amount of fuel injection, making the combustion process in terms of productivity and strength.
2. Higher Fuel Pressure:
CRDI systems run at much higher pressures of fuel as compared to the ordinary fuel injection systems. This high pressure also makes the fuel will be atomized finely so that the combustion will be better, fuel efficiency also will be improved.
3. Reduced Emissions:
Precise control of the fuel injection for the CRDI leads to a complete combustion of the fuel. Not only does this efficiency improve performance but at the same time it allows for less harmful emissions and therefore is in line with environmental standards and regulations.
4. Improved Fuel Economy:
There is better fuel economy in over-all due to the optimized combustion process and the increased fuel efficiency. CRDI vehicles tend to give us a better MPG hence are more cost effective for the users.
5. Enhanced Power and Torque:
Forensic imaging serves to combine powerful technique capabilities broadly spreading across the state, at the same time, due to the exceptional dynamics, the imaging needs alter on every technology workbench.Operation at very high efficiency through CRDI results in a better power and torque delivery. This is particularly more evident at low rpm, giving much better performance in a wide range of driving situations.
Operating Principle
Solenoid or piezoelectric valves make possible fine electronic control over the fuel injection time and quantity, and the higher pressure that the common rail technology makes available provides better fuel atomisation. In order to lower engine noise, the engine's electronic control unit can inject a small amount of diesel just before the main injection event ("pilot" injection), thus reducing its explosiveness and vibration, as well as optimizing injection timing and quantity for variations in fuel quality, cold starting and so on. Some advanced common rail fuel systems perform as many as five injections per stroke.
Common rail engines require very short (< 10 second) or no heating-up time at all , dependent on ambient temperature, and produce lower engine noise and emissions than older systems. Diesel engines have historically used various forms of fuel injection. Two common types include the unit injection system and the distributor/inline pump systems (See diesel engine and unit injector for more information). While these older systems provided accurate fuel quantity and injection timing control, they were limited by several factors:
- They were cam driven, and injection pressure was proportional to engine speed.This typically meant that the highest injection pressure could only be achieved at the highest engine speed and the maximum achievable injection pressure decreased as engine speed decreased.This relationship is true with all pumps, even those used on common rail systems; with the unit or distributor systems, however, the injection pressure is tied to the instantaneous pressure of a single pumping event with no accumulator, and thus the relationship is more prominent and troublesome.
- They were limited in the number and timing of injection events that could be commanded during a single combustion event. While multiple injection events are possible with these older systems, it is much more difficult and costly to achieve.
- For the typical distributor/inline system, the start of injection occurred at a pre-determined pressure (often referred to as: pop pressure) and ended at a pre-determined pressure. This characteristic resulted from "dummy" injectors in the cylinder head which opened and closed at pressures determined by the spring preload applied to the plunger in the injector. Once the pressure in the injector reached a pre determined level, the plunger would lift and injection would start.
In common rail systems, a high-pressure pump stores a reservoir of fuel at high pressure — up to and above 2,000 bars (psi). 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 has to maintain a commanded pressure at a target (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.
Advantages
- CRDi engines are advantageous in many ways. Cars fitted with this new engine technology are believed to deliver 25% more power and torque than the normal direct injection engine. It also offers superior pick up, lower levels of noise and vibration, higher mileage, lower emissions, lower fuel consumption, and improved performance.
Disadvantages
- Like all good things have a negative side, this engine also have few disadvantages. The key disadvantage of the CRDi engine is that it is costly than the conventional engine. The list also includes high degree of engine maintenance and costly spare parts. Also this technology can’t be employed to ordinary engines.
Applications
The most common applications of common rail engines are marine and locomotive applications. Also, in the present day they are widely used in a variety of car models ranging from city cars to premium executive cars. However, most of the car manufacturers have started using the new engine concept and are appreciating the long term benefits of the same. The technology that has revolutionized the diesel engine market is now gaining prominence in the global car industry.
CRDi technology revolutionized diesel engines and also petrol engines (by introduction of GDI technology). By introduction of CRDi a lot of advantages are obtained, some of them are, more power is developed, increased fuel efficiency, reduced noise, more stability, pollutants are reduced, particulates of exhaust are reduced, exhaust gas recirculation is enhanced, precise injection timing is obtained, pilot and post injection increase the combustion quality, more pulverization of fuel is obtained, very high injection pressure can be achieved, the powerful microcomputer make the whole system more perfect, it doubles the torque at lower engine speeds. The main disadvantage is that this technology increase the cost of the engine. Also this technology can’t be employed to ordinary engines.
Conclusion
Fuel delivery efficiency has never been higher thanks to the Common Rail Direct Injection system, which has unquestionably made a lasting impact on the automotive industry. CRDI technology leads the way in demonstrating the industry's dedication to innovation as demand for high-performance and environmentally friendly vehicles rises. The drive towards a more sustainable and efficient future for internal combustion engines is embodied by the CRDI system, which offers precision, control, and environmental benefits.