Seen from the modeling results in section IV.A, the flow rate model of the fuel supply system is a simple first-order inertia system in both control modes, therefore, for simplicity, this paper chooses PID control law which is the most widely used algorithm in practice as the controller for flow rate in the inner loop. Because the incremental PID control law is used widest in the computer control system, this paper selects the incremental PID control law as the controller, its equation can be obtained by referring literature [11]