Abstract
For the environmental issues on diesel exhaust emissions, this paper presents a new electrically controlled injector used for common rail fuel injection system. This injector consists of a high-speed switching pilot valve and a main needle valve with a position feedback slot. The needle valve is controlled in proportion to the pilot-valve operation by the internal hydraulic position feedback mechanism. It also has features of the quick response and the robustness against disturbances in the wide injection pressure range from 40 MPa to 160 MPa. The functions provide an advantage for reducing exhaust emissions by the variable injection control. As a result of the analysis using computational simulation and the measurement of the transient injection characteristics, it has been confirmed that the injector has flexible controllability to shape the optimal injection rates for various engine conditions.
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