However, it is still not enough to deliver an accurately metered amount of fuel at the proper time to achieve good combustion. The correct amount of fuel must be delivered to meet power requirement, that is, injection metering must be controlled.Fuel must be injected at the proper time, that is, the injection timing must be controlled and.In order for the engine to effectively make use of this fuel: The main purpose of the fuel injection system is to deliver fuel into the cylinders of an engine. All these features add up to a system whose cost may represent as much as 30% of the total cost of the engine. In addition to expensive materials and manufacturing costs, diesel injection systems are characterized by more intricate control requirements. Greater manufacturing precision and tight tolerances are also required for the system to function efficiently. This implies that the system component designs and materials should be selected to withstand higher stresses in order to perform for extended durations that match the engine’s durability targets. Unlike its spark-ignited engine counterpart, the diesel fuel injection system delivers fuel under extremely high injection pressures. While the main purpose of the system is to deliver fuel to the cylinders of a diesel engine, it is how that fuel is delivered that makes the difference in engine performance, emissions, and noise characteristics. In fact, the most notable advances achieved in diesel engines resulted directly from superior fuel injection system designs. The performance of diesel engines is heavily influenced by their injection system design. Fuel Injection System/Fuel Interactionsīasic Principles Purpose of Fuel Injection System.Common Diesel Fuel Injection System Architectures.Modern injection systems reach very high injection pressures, and utilize sophisticated electronic control methods. The main types of injection systems include pump-line-nozzle, unit injector, and common rail. Abstract: The purpose of the fuel injection system is to deliver fuel into the engine cylinders, while precisely controlling the injection timing, fuel atomization, and other parameters.

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