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为了提高主燃油控制装置的可靠性,在设计方案中增加了泵转换单元和计量转换活门。泵转换单元连接燃油计量子系统和导叶作动子系统,计量转换活门连接主燃油电液伺服阀与热计量电液伺服阀,实现了泵源备份和计量控制备份功能。通过AMESim建立的主燃油控制装置的数学模型对两个新增备份转换装置及功能进行了性能仿真,重点分析了备份切换过程中压力、流量等参数的波动情况。仿真结果表明:泵备份切换和计量备份切换过程引起的燃油波动都能在较短时间内恢复,分别为0.3s和1s。主燃油控制装置在单泵源状态工作时,导叶作动子系统工作正常,对计量燃油子系统的影响极小。
In order to improve the reliability of the main fuel control device, a pump conversion unit and a metering switch valve are added in the design scheme. The pump conversion unit is connected with the fuel metering subsystem and the guide vane action subsystem, and the metering switch valve is connected with the main fuel electro-hydraulic servo valve and the heat metering electro-hydraulic servo valve to realize the pump source backup and metering control backup. Through the mathematical model of the main fuel control device established by AMESim, the performance simulation of two new backup conversion devices and their functions was carried out. The fluctuation of pressure, flow and other parameters in the backup switching process was analyzed emphatically. The simulation results show that the fluctuation of pump caused by pump backup switchover and metering backup switchover can be recovered within a short period of time, which are respectively 0.3s and 1s. When the main fuel control unit is working in a single pump state, the guide vane actuation subsystem is working properly and has minimal impact on the metering fuel subsystem.