Discrete Reduced-order Active Disturbance Rejection Control for Marine engines using Variable Sampling Rate Control Scheme under Limited Bandwidth

Abstract

In this paper, the reduced-order active disturbance rejection control (RADRC) is studied for marine engine speed control. The benefits of using RADRC are demonstrated by bode diagram method with the transfer function between input disturbance and system output. Discrete RADRC and active disturbance rejection control (ADRC) are designed for marine engine speed control by adopting variable sampling rate control method. The proposed method is assessed by experiment on a hard-in-loop (HIL) engine test platform. Except the step-response indexes, ADRC and RADRC are compared in more indexes. The results demonstrate that RADRC has superiority during the sudden load varying process. For steady-state, a single smaller observer bandwidth in RADRC can make a good compromise for a wide range engine speed. It also has been found that the index of total variation (TV) in control input for RADRC is inferior to the ADRC. Overall, RADRC is a promising method for marine engine speed control.