Ring Bus Architecture for Aviation Data Exchange
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Solution Overview
Problem
Conventional bus architectures in aviation face challenges in achieving high availability and low error rates while minimizing weight, as connecting each bus user to a separate data line increases weight and is not fault-tolerant when the data line is cut.
Innovation Solution
A ring-shaped data line with transceiver units at both ends of the central processing unit, allowing for clocked data emission and monitoring, ensuring deterministic data exchange and error detection by synchronizing bus user activity, and using dual transceiver units for monitoring and error prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each bus user is connected to the central processing unit via a separate data line, then the error rate is low, but the weight increases and cannot be tolerated in aviation
Solution Approach 1:
Multiple bus users are connected to the central processing unit through a common data line instead of separate data lines, merging multiple communication paths into a single shared medium. This reduces the overall weight of the system while maintaining communication functionality through protocols that manage shared access and detect errors.
2Weight of moving object
If a common data line is used for multiple bus users, then the weight is reduced, but the error rate increases and fault tolerance decreases
Solution Approach 1:
A feedback mechanism is implemented where the central processing unit monitors the common data line for errors and sends control signals to bus users. When an error is detected or a bus user becomes inactive, the central unit can identify and isolate the problematic user, maintaining system reliability despite using a shared data line.
Solution Approach 2:
The system performs preliminary error detection and isolation actions before complete system failure can occur. The central processing unit continuously monitors the data line and prepares isolation mechanisms in advance, so when errors occur, they can be quickly contained without affecting the entire system.
3Reliability
If the data line is cut through, then the bus users connected in the separated part are removed from data exchange, but the system should maintain high availability
Solution Approach 1:
The system segments the bus users into different groups that can be independently managed. When a data line cut or failure occurs in one segment, the central processing unit can identify the affected segment and continue data exchange with other segments through the same data line, maintaining overall system availability.
Data Source
AI summary
A bus architecture has a central processing unit, a data line and bus users. The central processing unit and the bus users are connected to the data line via a bus interface. The data line is constructed as a ring and the central processing unit has two transceiver units which can be switched between transmit and receive modes. The central processing unit provides a clocked emission of data intended for the bus users. The bus users are successively connected to the data line, and each contains a monitoring unit, which is connected to the associated bus interface and is configured for activating a transmit activity of the bus interface only after receiving a synchronization message, and otherwise blocks this activity. In a method for exchanging data with such a bus architecture, a high fault tolerance, particularly when the data line is cut through, and error locating capability are achieved.