How does a common rail diesel fuel system work?
Abstract: In the common rail system, fuel is distributed to the injectors from a high pressure accumulator, called the rail. The rail is fed by a high pressure fuel pump. The pressure in the rail, as well as the start and end of the signal that activates the injector for each cylinder are electronically controlled.
What is common rail fuel injection system?
Common rail is a fuel injection system found in modern diesel engines. In common rail systems, the fuel is supplied to the engine under pressure with electronically controlled precision. This provides a level of flexibility which can be exploited for class leading levels of emission control, power and fuel consumption.
What are the different types of diesel fuel systems?
There are three common architectures of diesel fuel injection systems:
- Pump-Line-Nozzle.
- Unit Injector.
- Common Rail.
What is the difference between common rail and direct injection?
A common rail is one of the most important components in a diesel and gasoline direct injection system. The main difference between a direct and a standard injection is the delivery of fuel and the way how this one mixes with incoming air. The common rail is a long metal cylinder.
How many types of common rail injection system are there?
Two common types
Two common types include the unit-injection system and the distributor/inline-pump systems. While these older systems provide accurate fuel quantity and injection timing control, they are limited by several factors: They are cam driven, and injection pressure is proportional to engine speed.
How is common rail diesel diagnosed?
5 Tips for Diagnosing Common Rail Diesel Fuel Injection System
- Tip 1: Do not Pinch or Restrict the Fuel Return Line.
- Tip 2: Do Not Over-pressurize the Fuel Inlet.
- Tip 3: Minimize Condensation Formation and Water Contamination – Fill ‘er Up!
- Tip 4: Change Fuel Filters Regularly and Improve Filtration.
What are the different types of fuel systems?
The fuel injection types used in newer cars include four basic types:
- Single-point or throttle body injection.
- Port or multipoint fuel injection.
- Sequential fuel injection.
- Direct injection.
Is TDI common rail?
TDI engines using common rail fuel injection (using piezoelectric fuel injectors) were introduced with the Volkswagen Group 32v TDI V8 engine used in the 1999 Audi A8 3.3 TDI Quattro, two years after the 1997 Alfa Romeo 156 2.4-L JTD became the first passenger car to use common rail injection.
What are the types of common rail diesel injectors?
Several types of injectors can be used in common rail systems, including servo controlled electrohydraulic injectors and direct acting injectors….Injectors
- servo controlled electrohydraulic injectors,
- servo controlled electrohydraulic injectors incorporating pressure amplification, or.
- direct acting injectors.
What are the components of common rail injection system?
Abstract: The components of a common rail fuel injection system include the rail, a high pressure pump and fuel injectors….Injectors
- servo controlled electrohydraulic injectors,
- servo controlled electrohydraulic injectors incorporating pressure amplification, or.
- direct acting injectors.
Why do common rail injectors fail?
Water contamination: Another common cause of Common Rail injector failure is contamination from excess water in the fuel. If not stored or handled correctly, water can enter the fuel and will react with the chemicals in it to corrode metal surfaces and reduce lubrication between the moving parts.
What is function of common rail in diesel engine?
Common rail uses a high-pressure rail to deliver fuel to each solenoid valve. This is opposed to the traditional direct fuel injection system of using low-pressure pump nozzles to deliver fuel while producing more emissions. The common rail diesel engine allows for better emission control and consumption of fuel and power .
What is the most common fuel injection system?
As technology advances, direct injection engines may become easier to manufacture, but, for now, sequential multi-port injection remains the most common fuel injection system in cars today. It provides the right mix of efficiency and affordability for most applications.
How is diesel fuel injection systems work?
Diesel engines use a fuel injector to deliver fuel to the cylinders. The injection process is different from gas engines, which uses a carburetor or a port injection system. While a carburetor mixes air and fuel before the former makes it to the cylinder, a port injection system mixes fuel before the intake stroke. Diesel engines use a direct injection system that inserts fuel directly into the motor cylinders .
What are common rail injectors?
A common rail-injector is a fuel-injector system used in diesel and gasoline engines. The fuel injectors in a common rail-injector system are all supplied by a common rail, or pressure accumulator, that stores fuel at high pressure. The accumulator directly supplies the injectors with fuel.