Research And Design Of Integrated Controller Of Main Wheel Braking System And Nose Wheel Steering System In Aircraft

Wheel braking system and nose wheel steering system are key airborne equipments which play an important role in taking-off and landing safely. When the aircraft is running on the ground, it is necessary to have the two systems working in cooperation. However, during the past research, the two systems have being developed independently. It reduced the performance of them when the runway is slipped or the airplane is surrounding by strong wind, because the malfunction of anti-braking and cross-protecting of the main wheel braking system didn’t prompt the nose wheel steering system, and it’s hard to switch between large gain and small gain angle control automaticly, since the nose wheel steering system didn’t detected the speed of the main wheel. So, In order to improve the flexibility and reliability of the aircraft when operating on the ground, it is necessary to research and develop integrated controller of the two systems.In this thesis, the structure and working principle of digital main wheel braking system and nose wheel steering system are analysed, based on which, a design scheme of the integrated controller is proposed. Redundant technology is adapted in the design, which can greatly improve the two systems’reliability and the redundant technology is studied in detail from the following four aspects:cross-channel data link, synchronous control, signal monitoring and vote, fault diagnose and system reconfiguration, in the end, a cross-channel hot standby management strategy is adapted for the dual-redundant system.The detail hardware design circuit is completed, which based on the micro-processor DSP and CPLD, and the software design is finished in the integrated development environment CCS and ISE. At last, a test is done to verify the performance of the integrated controller under the Hardware-In-The-Loop simulation test platform for the main wheel braking system, and it turns out that, the integrated controller can finish anti-skid braking task and nose wheel steering task stably and reliably, when fault happens in the system, it can switch to the redundant system and keep on working.