A Novel Dual-Redundancy More-Electric Braking System and Regulation Strategy Based on ON/OFF Valves

The aircraft braking system is an essential subsystem of the aircraft, with high safety requirements. The conventional aircraft braking system has complex and long pipelines that are prone to leakage and vibration. To improve the reliability and safety of the aircraft, a dual-redundancy more-electric braking system (DMEBS) based on on/off valves was proposed. The DMEBS has dual-redundant nonsimilar hydraulic power sources to improve the reliability of the system. The on/off valves were utilized as brake control valves to improve the robustness of the system. In addition, an energy management strategy and a high-precision brake pressure regulation algorithm were designed for the DMEBS. The rule-based logical threshold energy management strategy relies on real-time velocity and multiple thresholds for allocating hydraulic power sources, aiming to reduce the electrical power of the DMEBS. The nonlinear flow rate control method (NFRCM) can realize high-precision brake pressure and low power. A prototype was developed, and then, it was tested on an experimental bench and a ground inertial test bench to verify the performance of the DMEBS and regulation strategy. The experimental results show that the pressure error of the NFRCM is within 0.2 MPa, while the standard deviation and other indicators show superior performance compared to conventional controllers.