In order to reduce the common rail pressure fluctuation of marine diesel engines with dual high-pressure oil pumps

a model-based dual-pump cooperative common rail pressure control method was proposed. In view of the structural characteristics of the high-pressure common rail system

a simplified model of fuel injection volume

fuel supply volume and common rail pressure change was established. A dual-pump coordination strategy aimed at minimum pressure deviation was designed to determine the number of fuel supply pumps. A model-based active disturbance rejection control algorithm was designed. Model-based feedforward control was used to reflect the status of fuel system components

active disturbance rejection control was used to suppress rail pressure fluctuations

and real-time observers were used to estimate and compensate system disturbances online. The control method was verified on the marine diesel engine simulation platform. The simulation results show that the dual-pump cooperative strategy takes advantage of the large fuel supply of the dual-fuel pump

and at the same time avoids the problem of excessive overshoot when the fuel supply is large. Compared with the traditional PID control method

the model-based dual-pump coordinated rail pressure control method can reduce the overshoot by more than 77% during the step test. Using integrated time absolute error index to evaluate the control effect

the model-based dual-pump coordinated rail pressure control method can improve the control effect by more than 66% compared with the traditional method.