波音737NG飞机发动机电子控制组件(EEC)工作方式分析

Mode Analysis of Electronic Engine Control(EEC)of Boeingg 737NG Aircraft

波音737NG飞机的发动机EEC工作方式分为正常和备用两种,备用方式又分为软备用(soft alternate)和硬备用(hard alternate)两种。波音公司提供的技术资料包含了触发EEC软、硬备用两种方式的工作条件以及对发动机推力的影响,但不包含备用方式的工作原理和依据。本文将利用气体状态参数和气体理想绝能滞止状态的计算公式,对软、硬备用方式的工作原理进行分析和说明,帮助相关工作人员(飞行员、维修人员)更好地理解EEC工作方式,提升安全运行水平。

The engine EEC of Boeing 737NG can-be divided into normal modes and alternate modes,and the alternate modes include soft alternate modes and hard alternate modes.The technical data provided by Boeing company includes the working conditions of triggering EEC soft alternate modes and hard alternate modes,and the influence on engine thrust,but does not include the principle and basis of alternate modes.In this article,the principle of soft alternate modes and hard alternate modes will be analyzed and explained by using the calculation formula of gas state parameters and gas ideal absolute stagnation state,so as to help relevant staff(pilots,maintenance personnel)understand the EEC working modes better and improve the level of a safe operation.