![]() In common rail direct injection, the combustion takes place directly into the main combustion chamber located in a cavity above the piston crown. ![]() However, they considerably differ from each other on parameters such as pressure & type of fuel used. Both these technologies have a similarity in design since they consist of “fuel-rail” which supplies fuel to injectors. However, in diesel engines, manufacturers refer to this technology as CRDi whereas petrol engines term it as gasoline direct injection or fuel stratified injection. Both petrol and diesel engines use a common ‘fuel-rail’ which supplies the fuel to injectors. Most modern engine’s fuel systems use an advanced technology known as CRDi or common rail direct injection. 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 used materials are usually steel and stainless steel. Good mechanical properties ensure strength and prevent corrosion. The material selection is also a point that shouldn’t be underestimated. Defining the right parameters in the design phase is essential, but what really matters is strictly following them during the manufacturing process. ![]() Even a minimal size or shape fluctuation could lead to failures. ![]() Precise design contributes to better common rail performance. Both diesel and gasoline engines tend to become smaller and lighter for better fuel efficiency and improved performance which increases the fuel pressure and sets entirely new standards for the manufacturing of a high-quality common rail.įirst, the geometrical accuracy of the component is of critical importance. The increase in the fuel pressure is a result of the latest engines’ design. It receives the fuel from the pump and distributes it to the injectors under extremely high pressure. The common rail is a long metal cylinder. The system consists of a high-pressure pump, injectors, a rail, and an electronic control unit. The main advantages of the common rail direct fuel injection can be summarised in reduction of exhaust and noise emissions, better fuel efficiency and improved overall engine performance. Controlled by the electronic unit, the fuel is squirted directly where the combustion chamber is hottest, which makes it burn more evenly and thoroughly. In the direct injection system, the fuel is directly injected into the combustion chamber, skipping the waiting period in the air intake manifold. 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. Each system consists of a high-pressure pump, injectors, a rail, and an electronic control unit.Ī common rail is one of the most important components in a diesel and gasoline direct injection system. With the common rail system, however, pressure generation and injection are separate, meaning that the fuel is constantly available at the required pressure for injection.Ĭommon rail systems have a modular design. With conventional diesel injection systems, the fuel pressure has to be generated individually for each injection. The system is named after the shared high-pressure reservoir (common rail) that supplies all the cylinders with fuel. Bosch launched the first common rail system in 1997.
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