Design And Research Of Aircraft Anti-skid Braking Controller Based On FPGA

Anti-skid braking controller is the core of the anti-skid braking system. That high performance controller is the airplane launching and landing safeguard. Digital anti-skid braking controller responds more swiftly than analogous anti-skid braking controller. And complex control algorithm can be carried out in digital anti-skid braking controller, which also has advantages of stability, robustness and adaptability and highly efficiency. Therefore, to research of advanced control algorithm with digital anti-skid braking controller have great significance.In analysis the principle of anti-skid braking system, it proposed SOPC design proposal. And choose Actel Fusion FPGA as the core chip, which using CoreMP7 (ARM7) soft processor that facilitated advanced control algorithm realization. According to the Fusion FPGA resources and characteristic, using Libero 8.3 software platform to wheel speed disposal, servo valve PWM and system's faults detect circuit's on FPGA modular designs, which both simplified the peripheral circuit design and sharpened system's antijamming. As the system has multi-duties and timeliness requests, it proposed to transplant embedded real-time operating system (μC/OS-Ⅱ) to CoreMP7. And it has completed design of various task programs under the system. As the system contains nonlinearity and uncertainty, it design a fuzzy index approach rate sliding model controller,which have fuzzy and sliding model characteristic that fuzzy control can adjust parameters, and sliding model control has the immunity to the system parameters change and exterior disturbance.The simulation carried on different runway, which based on airplane system model. It indicated that the fuzzy index approach rate sliding model controller both can guarantee the structure control robustness and also effectivly weakened the system's buffeting, it has great effect in the improvement of airplane braking performance aspect.