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Common Rail Type Fuel Injection System | 2 Types of Common Rail Injection System | Reasons Why CRDI Diesel Engine Is Getting More Popular In The Past Decade

Diesel Engine Common Rail Type Fuel Injection System

A manifold runs along the length of the engine, slightly below the cylinder cover level, for common rail type fuel injection system. It has a specific amount of fuel oil storage capacity and is designed to dampen pressure waves. Fuel is supplied from the common rail to the conventional fuel injection valves through a separate injection control unit for each engine cylinder. The control units establish the form of the injection pattern, control the volume of fuel injected, and manage the timing of fuel injection.

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What are the different types of common rail-type fuel injection systems?

The unit injector and the distributor/inline pump systems are two typical kinds.

What is the role of the common rail type fuel injection system in an injection system?

The rail acts as a gasoline accumulator, allowing the engine to maintain a reasonably consistent pressure at all fuelling rates. Fuel is delivered to the injectors through high-pressure pipes from the rail. Current pulses are generated by the ECU, which energises a solenoid valve in each injector in turn.

What is the common rail pressure?

A direct fuel injection system for petrol and diesel engines is known as a direct common-rail type fuel injection system. It uses a high-pressure (2,000 BAR – 29,000 PSI) fuel rail to supply individual solenoid valves on diesel engines, rather than a low-pressure fuel pump to feed unit injectors or pump nozzles.

What makes common rail injectors so costly?

Diesel injectors must be significantly more durable in order to transport diesel fuel and resist the tremendous pressure of combustion. Diesel injectors are naturally more costly due to the more sophisticated and robust design requirements. Unlike gasoline injectors, which operate with a lower tolerance.

Electronic control common rail type fuel injection system with solenoid injectors

An electronic control common rail type fuel injection system drives an integrated fuel pump at an ultrahigh pressure to distribute fuel to each injector per cylinder through a common rail. There is nothing like a diesel engine compared to other combustion engines. Its adaptability is due largely to its great efficiency and cost-effectiveness. Diesel engine injection system needs are continuously evolving: higher pressures, shorter switching times, and the ability to adjust the injection pattern to fit operating conditions make the diesel engine both efficient and powerful.


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This enables optimum combustion to generate big horsepower, and reduce PM* (diesel plume) and fuel consumption.

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Bosch will supply the complete common-rail injection system for the high-performance 12-cylinder engine introduced by Peugeot Sport for its latest racing car. The system comprises high-pressure pumps, a fuel rail shared by all cylinders (i.e., a common rail), piezo in-line injectors, and the central control unit, which compiles and processes all relevant sensor data.

CRDI Diesel Engine

Common Rail Diesel Ignition

Modern diesel engines use a common rail fuel injection system. Common rail-type fuel injection systems offer a level of flexibility that may be used to achieve best-in-class pollution control, power, and fuel efficiency. Original Equipment Manufacturers (OEMs) may now design for maximum performance and end-user value across a broad variety of equipment and applications.


For the flexibility they give while fulfilling the most rigorous pollution control regulations, a growing number of contemporary diesel engines use common rail direct injection (CRDi) fuel systems. Fuel is delivered to the engine under pressure and electronically controlled consistency in common rail systems. This gives a degree of flexibility that may be used to achieve best-in-class emissions control, power, and fuel efficiency.


Is CRDI a turbocharger?

Hyundai and Kia cars use CRDI engines, which are turbocharged power units. The efficiency of CRDI engines is a plus, as is the lower amount of hazardous chemicals in the exhaust.

What are the benefits of the CRDI engine?

Benefits of the CRDI system:

The CRDI system may regulate fuel flow based on the load and speed of the engine. For multiple cylinders, this system just requires one fuel pump. The CRDI system is environmentally friendly since it minimizes noise, smoke, and particulate matter. It produces a lot of power at low rpm.

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