Architecture of backup system of fly-by-wire flight control system

Abstract

The invention belongs to the technical field of flight control systems, and relates to an architecture of a backup system of a fly-by-wire flight control system. The architecture is composed of a backup control displacement sensor, a backup flight control computer, a backup energy source, a pitot tube and a pressure conversion device. The main purpose of the backup system is to back up the flight control function of a control device (a flight control computer or actuator control electronics) in the normal flight control system, and take over the flight control of the aircraft when the normal flight control system cannot safely control the aircraft. The dynamic pressure of the airflow outside the aircraft is introduced to ensure that the backup system is started after the aircraft reaches a certain speed, so that the problem that the backup system is started in advance when the aircraft is in a parking state is solved; the instruction of the backup system is set to be prior to the instruction of a normal control system, so that the possibility of mixed use of the control instruction of the backup system and the instruction of the normal flight control system is eliminated.

Description

technical field [0001] The invention belongs to the technical field of flight control systems, and relates to a backup system architecture of a fly-by-wire flight control system. Background technique [0002] Civil aircraft flight control systems have strict safety requirements, especially the requirements to prevent common mode faults. Therefore, in addition to the normal flight control system that realizes complete control functions (such as the function of improving the ride quality, the function of providing envelope protection, the function of providing alarms, etc.) Axis primary control surfaces—deflection control of ailerons, rudder, and elevator) backup system. With the development of flight control system electronic devices, the backup system of civil fly-by-wire aircraft has developed from the traditional mechanical backup system to the commonly used electric backup system. [0003] In order to prevent the backup system and the normal flight control system from f...

AI Technical Summary

Problems solved by technology

[0004] Therefore, there are the following design requirements for the backup system: 1) When the normal flight control system cannot realize the safe control of the aircraft, the backup system must automatically, timely and accurately take over the control of the aircraft; 2) When the normal flight control system is available , the backup system should not take control of the normal flight control system; 3) The backup system should not be mixed with the normal flight control system

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