Introduction to design of speed controller for fuel pump

This contribution presents an efficient approach to design of speed controller for fuel pump. The fuel pump is used for two-shaft turbine engine concept with reducer driven by a free turbine. Controlling the amount of fuel injection into the combustion chamber is based on the speed control of the fuel pump which is controlled by the engine control unit according to the desired power mode. The resulting flow of fuel into the combustion chamber beside the pump speed regulator influences the bypass which constricts the return fuel according to pressure in the nozzles. Control characteristic of the bypass controller is fixed and is determined by its structure. The only adjustable parameter is the speed of the fuel pump. This paper describes the design procedure of this fuel pump using a two-level controller with speed and subordinate current-torque control.