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AS Physics Coursework Unit 3: Delphi Automotives Needle Lift: A Fuel injector is electronically controlled valve, which contains amongst other things a tightly coiled spring and a needle (see diagram: however this is a electromagnetic fuel injection system). A pump connected to the fuel injector pushes highly pressurised fuel down to the bottom of the injector, causing pressure to build up. When the pressure reaches around 1600 bar (1,600,000,000 Nm-2), the needle is forced upwards, creating a hole in the injector. The fuel then, moves from an area of high pressure to an area of low pressure, dispersing. The tiny nozzle is designed to atomise the fuel, which aids combustion (due to greater surface area). This process is completed a vast number of times per second. Diagram: For many years the Hall effect was not applied practically due to the generated voltage in the metal was so extremely low. However towards the...

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