A CAS Message Simulation Module Used in Civil Aircraft for Air Management System Failure Diagnosis

摘要

Air management system is one of the most important airborne systems on civil aircraft,which is responsible for controlling aircraft bleed air,cabin pressure control,wing anti-icing,cabin ventilation and temperature control.And the air management control system is the brain and neural network of the entire air management system.The air management control system control the various subsystems of the air management system and control the air management system to work together with other interfaced systems.Air management system control logic and interface signals are the key points and most difficulty parts in air management system control.For this highly complex system,failure diagnosis is most important and difficult part in ground test and flight test.Usually faults are reflected on the CAS message and synoptic pages as the alarms.However,the causes of such alarms may be varied.The traditional trouble shooting approach is to check the control specification documents which are complicated and hard to find the root cause.If there is a CAS message simulation module database that can be quickly traced back to the trigger logic of any one of the alarms,and the signal relationship between the alarms is displayed,the control logic of the system is clearly displayed,the failure diagnosis would became simple and intuitive.Based on the above design intention with referring to control specification,this paper created a set of air management system alarm models by using Matlab/Simulink.These alarm models are used for system troubleshooting and design's optimization.Finally,an application of cabin pressure control alarm with both trouble shooting and optimization is introduced.