Design of Giant Magnetostrictive Actuator for fuel injector

This paper presents a basic research on giant magnetostrictive actuator (GMA) for fuel injector. An injector is a pilot operational valve with position servomechanism, which enables to control injection rate freely with input current into the actuator. Based on the combination of finite element analysis and experiment, a prototype of GMA is successfully made as well as the test platform. The injector is actuated by a GMA which outputs displacement of 38.3 mum within 0.03s. The result shows that the analysis of finite element computation meets well with the experimental research. It has a significant guidance meaning for the design and application of GMA based on giant magnetostrictive material (GMM). And this actuator can be also used for active vibration reduction.