Improved processing and performance of GDI injector based on metal injection molding technology

摘要

A new near-net-shape technology (MIM Technology) has been first introduced to GDI injector processing expected to solve the problems of inefficiency, low machining accuracy, low material utilization rate and unstable performance that exist in traditional processes. In order to improve the comprehensive performance of GDI injector Fe-based Nano-crystalline, soft magnetic alloy material has been used, and some structures of the magnetic circuit parts have been optimized. The excellent machinability, physicochemical properties, materials applicable of the MIM technology has been analyzed by tracking test. The comprehensive performances of different GDI injector samples have been analyzed by simulation analysis and experimental validation. As a result, the samples which were processed by the MIM technology reduce the skin effect and eddy current loss by 9.8%, accelerate the starting current rise rate by 2.5% and shorten the dynamic response time by 14.2%. The dynamic injection quantity increases by about 2.5%, and the linear range of dynamic fuel injection quantity is expanded about 9.6%.