Numerical analysis of common rail electro-injector for diesel engines

The common rail electro-injector is the most complicated and important component in the common rail injection system of a diesel engine, whose configuration and performance determine the performance of the common rail injection. The work process of a common rail electro-injector involves the electromagnetism, mechanical dynamics and hydrokinetics, and there are coupling phenomena in these systems. This research deals with the development of a numerical tool for understanding operating condition of the electro-injector. The electro-injector simulation model was developed with MATLAB/Simulink, and consists of three subsystems: the electrical subsystem, the mechanical subsystem and the hydraulic subsystem. All functional parts of the electro-injector are modeled as modules that interchange via definite input and output parameters. The models simulate the electro-fluid-mechanical behavior of the injector. Validation against experiments has been performed. The model has been used to provide insight into the operating conditions of the electro-injector and highlight the application to injection system design.