H _∞ State Feedback Fuzzy Control of Rail Injection Systems in Ships

This study presents a robust control strategy for Diesel engine injection systems in ship applications, focusing on the regulation of pump pressure through a state feedback control approach with an $\mathrm{H}_{\infty}$ performance criterion. The objective is to maintain the pump pressure at a desired reference by adjusting the engine speed. To accurately capture the nonlinear dynamics of the system, a Takagi-Sugeno (TS) fuzzy model is employed. Based on this model and a descriptor framework, a state feedback controller is designed to guarantee precise pressure regulation while satisfying $\mathrm{H}_{\infty}$ performance requirements expressed as linear matrix inequalities (LMIs). The approach specifically addresses the rail injection system, which enables precise control of fuel delivery and timing. Simulation results demonstrate the effectiveness and robustness of the proposed strategy in maintaining accurate pump pressure despite bounded external disturbances.