Feedback control of the quantity of fuel injection for marine diesel engine using a direct drive volume control is proposed. A cylinder is connected to a fixed-displacement oil-hydraulic pump driven by an AC servo motor. A plunger pump is pushed by the cylinder piston and fuel is pressurized to be injected through an injection valve. The fuel injection is controlled by a drive signal of the AC servo motor. A mathematical model of the fuel injection system is built to estimate the quantity of fuel injection. The estimated quantity of fuel injection is compared with the target value. Proportional control action computes a control input signal which updates a crank angle to stop fuel injection. Simulation study demonstrates that the proposed feedback control system of the quantity of fuel injection successfully works.

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