CRDI AND MPFI PDF

Common rail injection is a form of direct injection fuel injected directly into the combustion chamber. Multi-point injection injects fuel into the intake port, just upstream of each cylinder's intake valve. In common rail systems a high pressure pump stores a reservoir of fuel at high pressure — up to and above 2, bars 29, 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.

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Common rail injection is a form of direct injection fuel injected directly into the combustion chamber. Multi-point injection injects fuel into the intake port, just upstream of each cylinder's intake valve. In common rail systems a high pressure pump stores a reservoir of fuel at high pressure — up to and above 2, bars 29, 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. I am seeing a number of differences. Was that not the OP question? True, they are both injection methods, but there are some differences between the systems. I took it as meaning injection system or delvivery system the injector part of the systems are fundamentaly the same the difference is the way the fuel is stored prior to injection.

Thanks i have saved it. New Post. Comments Format:. Subscribe to Discussion :. CR4 allows you to "subscribe" to a discussion so that you can be notified of new comments to the discussion via email. Rating Vote:. Score 1 Score 2 Score 3 Score 4 Score 5. Add Vote. Interested in this topic?

By joining CR4 you can "subscribe" to this discussion and receive notification when new comments are added. Comments rated to be "almost" Good Answers: Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them! None Same system different delivery.

No more "Almost" Good Answers. No, I don' think they are the same. Or, am I mixing it up? Common rail fuel injector History - Common rail today - Principles - See also en. The modern high-pressure injection systems VP44 distributor-pump, Unit Injector and Common Rail have transformed the ponderous, Well, right there is another difference: "In common rail systems a high pressure pump stores a reservoir of fuel at high pressure — up to and above 2, bars 29, psi.

Right on, man! Thought you might like another new smiley! Ask a Question Start a Discussion. Change Mode. Rate this. Comments: Nested. Register to Reply. Register to Reply Score 1 for Good Answer. Register to Reply Off Topic Score 5. Transportation: Go.

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Vikrant Dev Rathore. Gone are the days when vehicles used to be only mechanical machines. CRDi and MPfi help to improve the power, performance and reduce harmful emissions from a car engine. After extensive research. Mercedes Benz. In CRDi, the fuel system components are more intelligent. The traditional injectors.

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