辅助动力装置独立超转保护控制设计研究

doi:10.19416/j.cnki.1674-9804.2024.04.007

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辅助动力装置独立超转保护控制设计研究
DOI:
                        10.19416/j.cnki.1674-9804.2024.04.007
                    
作者:
                        
                        
                    
作者单位:上海飞机设计研究院，上海 201210
作者简介:何敏祥男，硕士，工程师。主要研究方向：APU设计。E-mail:heminxiang@comac.cc
通讯作者:何敏祥E-mail:heminxiang@comac.cc
中图分类号:V233
基金项目:

Study of APU in autonomous over-speed protection

Author:

Affiliation:

Shanghai Aircraft Design and Research Institute, Shanghai 201210 , China

Fund Project:

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摘要:

针对辅助动力装置超转故障，开展独立超转保护控制设计研究。介绍了独立超转保护总体设计方案、超转保护方法及BIT检测。研究确定了转速信号选择、超转保护转速,超转判断逻辑为任意一路转速（转速1或转速2）大于超转保护转速，即判断APU超转；APU超转后，通过紧急停车进行超转保护；设计APU转速低于10%，取消超转保护停车。同时为满足适航要求，设计机内自测试（BIT）功能，通过注入不同转速，检测转速传感器、独立超转保护电路等硬件，确保独立超转保护装置能正常工作。通过APU地面台架整机试验，验证独立超转保护有效。

Abstract:

To prevent the auxiliary power unit from over-speed, a study was done in autonomous over-speed protection. The protection overall scheme, protection strategy and built-in-test(BIT) were presented. The selection of speed signal and the protection speed were determined. If either speed 1 or speed 2 is larger than protection speed, the protection shall be performed. When an over-speed condition was detected, APU shall be shutdown. The protection shall not be performed when the APU speed was less than 10%.A built-in-test(BIT) technique was developed to meet the airworthiness requirement. The integrity of speed measuring circuitry test carried out by injecting known frequencies. Through the ground test of APU, the effectiveness of APU autonomous over-speed protection was verified.