Study on the Characteristics of Spring Preload in Injector
Abstract: The simulate model of EUP system was built in AMESim environment, and the model was cali- brated by comparing with the experiment results. Under the action of the same spring preload, the laws of injection pressure, injection rate, the rate of needle movement and fuel injection quantity which transform with the speed variation were researched. Furthermore, at different speeds, the mechanism of injection pressure, nozzle open pressure, injection duration time and fuel injection quantity which change with spring preload and speeds was explored. Finally, some conclusions have been drawn that at low speeds, reducing the spring preload appropriately can prevent needle closing caused by slower pressure building, and result in a good injection characteristics; at high speeds, spring preload changes have few influence on the injection pressure.
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