Abstract
In view of the shortcomings of the traditional high-pressure common rail electronically controlled injector in needle valve driving mode and driving components, a direct-drive type giant magnetostrictive injector (GMI) is designed. Based on the working principle of the GMI, the magnetic field model, hysteresis nonlinear model, and magnetostrictive model are established. The magnetic field model and hysteresis nonlinear model are simulated and analyzed, and the GMA magnetostrictive model is solved numerically and verified experimentally. Finally, COMSOL Multiphysics software is used to conduct electro-magnetic-mechanical coupling simulation analysis on the whole GMI output model, and the relationship between the needle valve lift of the injector and the output displacement of the actuator was obtained. The research results show that the displacement curve calculated using the GMA magnetostrictive model is basically consistent with the displacement curve measured by experiment, which proves that the established model can reflect the actual situation and verify the correctness of the model. The magnitude and direction of the GMI needle valve lift are determined by the magnitude and direction of GMA output displacement. The two directions are opposite, and the size ratio is 4, so when the current is 6 A, the GMA output displacement is 0.12 mm, and the needle valve lift is 0.48 mm, which meets the requirements of the injector needle valve lift, verifies the feasibility of GMI structure design, and has good theoretical and practical guiding values.
Highlights
The electronic control fuel injector is the core component of high-pressure common rail injection systems
Its working principle is to determine the opening and closing of the needle valve by controlling the driver according to the signal sent by the electronic control unit (ECU)
The correctness of the model is verified by the theoretical calculation and experimental test, and the feasibility of giant magnetostrictive injector (GMI) structure design is verified by simulation so as to provide reference for GMI research
Summary
The electronic control fuel injector is the core component of high-pressure common rail injection systems. The high-pressure oil in the common rail pipe is injected into the combustion chamber through the injector.. The high-pressure oil in the common rail pipe is injected into the combustion chamber through the injector.1,2 In this working process, the type of actuator, the driving mode of the needle valve, and the magnitude of the needle valve lift directly affect the fuel injection performance. According to the type of actuator, the electronic control fuel injector can be divided into electromagnetic type and piezoelectric type. The magnetic field model and hysteresis nonlinear model are simulated and analyzed, and the magnetostrictive model is solved numerically and verified experimentally. The correctness of the model is verified by the theoretical calculation and experimental test, and the feasibility of GMI structure design is verified by simulation so as to provide reference for GMI research
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