Abstract
Electronic fuel injection of internal combustion engines is an accurate means of preparing the proper air-to-fuel mixture for the individual cylinders under all operating conditions. The precise amount of fuel required by the engine for any given cycle depends directly upon the amount of air ingested during each stroke. Fuel delivery is accurately regulated via a number of sensors located strategically around the engine. These sensors convert physically measurable quantities, such as engine speed and manifold absolute pressure, into proportional electrical signals which are processed by an electronic control unit (ECU). The ECU, in turn, is programmed to determine nearly instantaneously the amount of fuel necessary to ensure the highest torque, best fuel economy, and lowest exhaust emissions under the prevailing conditions represented by the input sensor signals.
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