Aircraft Brake Control Redundancy via Backup Controller Override
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Solution Overview
Problem
Aircraft brake control systems face challenges in ensuring reliable operation of brake valves, particularly when the primary brake control unit (BCU) fails, as existing systems lack effective redundancy to maintain safe braking functions.
Innovation Solution
A redundant control system is implemented, featuring a backup controller electronically coupled to the brake valves and switches, which receives redundant inputs to determine if the BCU is functioning improperly and takes control to prevent the BCU's signals from reaching the valves, outputting backup control signals to maintain brake functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primary brake control unit (BCU) is used to control brake valves, then the braking system can operate normally, but the system lacks redundancy and reliability when the BCU fails
Solution Approach 1:
A backup controller is pre-configured and positioned to take over control of the brake valves immediately upon detection of BCU failure. The backup controller is electronically coupled to the brake valves and switch, and is pre-programmed with the necessary control logic to maintain braking functionality without requiring system reconfiguration or manual intervention.
Solution Approach 2:
A switch is introduced as an intermediary component between the BCU and the brake valves. This switch can selectively connect or disconnect the BCU from the brake valves based on the operational status of the BCU. When the BCU fails, the switch redirects the control signal path to the backup controller, ensuring continuous control of the brake valves.
2Reliability
If redundancy is added to the brake control system, then reliability improves, but the device complexity increases
Solution Approach 1:
The backup controller is pre-positioned and configured in the system architecture, ready to assume control immediately upon BCU failure. This preliminary arrangement eliminates the need for complex real-time decision-making or system reconfiguration, reducing the operational complexity despite the added hardware component.
Solution Approach 2:
The switch acts as a simple intermediary that provides a straightforward path switching mechanism between the primary BCU and backup controller. This intermediary component simplifies the integration of redundancy by providing a clear, binary connection state (BCU connected or backup controller connected) without requiring complex control logic.
Data Source
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AI summary
A system for controlling a brake valve corresponding to a first brake of an aircraft, comprising: a first brake valve (248) configured to control pressure applied to the first brake; a brake control unit, BCU, (150) configured to receive a first plurality of inputs and to output a first BCU control signal for controlling the first brake valve based on the first plurality of inputs; a first switch (232) coupled between the first brake valve and the BCU; and a backup controller (160) electronically coupled to the first switch and the first brake valve and configured to: receive a second plurality of inputs, determine a first backup control signal for controlling the first brake valve based on the second plurality of inputs, determine that the BCU is functioning improperly based on the second plurality of inputs, and control the first switch to prevent the first BCU control signal from controlling the first brake valve and to output the first backup control signal to the first brake valve in response to determining that the BCU is functioning improperly.