This book takes the high-performance electromagnetic linear actuator directly driven fluid control valve system as the research object, with the goal of improving the control performance of the fluid transmission and control system. Through a combination of system solution design, theoretical analysis, mathematical modeling, simulation calculation and experimental verification, it conducts in-depth and detailed research on the control technology of the electromagnetic linear actuator directly driven fluid control valve system and the reluctance linear displacement sensor. Including introduction, design of fluid control valve directly driven by electromagnetic linear actuator, mathematical model and simulation analysis of fluid control valve system, research on reluctance displacement sensor, research on lift control of directly driven fluid control valve, and model-free adaptive control of directly driven fluid control valve.