| Citation: | WANG Xi. Two variable combination control of propeller engine piecewise scheduling[J]. Journal of Aerospace Power, 2022, 37（10）：2261-2271 doi: 10.13224/j.cnki.jasp.20220118
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Starting from the working principle and characteristics of turboprop engine and the design requirements of full authority digital engine and propeller control (FADEPC), the univariate regulation methods of equal turbine front total temperature regulation, equal rotor speed regulation and equal propeller power regulation, as well as the bivariate regulation methods of keeping the total turbine front temperature unchanged or propeller power unchanged by adjusting the fuel flow, and keeping the rotor speed unchanged by adjusting the blade installation angle were analyzed. According to the working characteristics of turboprop engine and from the perspective of control realizability, an open-loop + closed-loop structured piecewise scheduling bivariate combined control method was proposed, in which the propeller engine was adjusted according to equal propeller power, equal rotor speed and equal total temperature behind the turbine within the whole flight envelope, and switched according to the power limit height designed. The feasibility of the control method was verified by simulation under three different flight speeds, and the maximum relative error of rotating speed was 0.1%.
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