EMB Communication Layout With Redundant Brake Control Lines
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Solution Overview
Problem
Existing electro-mechanical brake (EMB) systems face challenges in transmitting and receiving large amounts of communication data at high cycles while ensuring stability and reliability, particularly when failures occur.
Innovation Solution
A communication system with a redundant design featuring three communication lines - a first and second line for primary communication and a third line as a backup, allowing for longer cycle times in specific scenarios, and utilizing multiple processors for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If communication data is transmitted at a higher cycle with larger amount of information, then communication precision and control accuracy are improved, but communication stability and reliability deteriorate
Solution Approach 1:
The communication system segments communication lines into primary lines (first and second communication lines) for high-speed data transmission and a backup line (third communication line) for reliability. This segmentation allows the system to maintain high communication precision through the primary lines while ensuring stability through the dedicated backup line that can take over if failures occur.
Solution Approach 2:
The system implements beforehand cushioning by pre-configuring a third communication line as a backup before any failure occurs. This backup communication line is prepared in advance with appropriate cycle time settings to compensate for potential failures in the primary communication lines, ensuring continuous reliable operation without interruption to braking control.
2Device complexity
If a single communication line is used for all BWCs, then device complexity is reduced, but reliability deteriorates due to single point of failure
Solution Approach 1:
The system divides BWCs into multiple groups (first group and second group) with dedicated primary communication lines for each group. This segmentation prevents a single point of failure from affecting all wheels, as each group has its own independent communication path. The third communication line provides additional redundancy that can support any group if needed.
Solution Approach 2:
The system changes the operational parameters of communication lines dynamically. The third communication line operates with a longer cycle time than the primary communication lines, allowing it to function as an energy-efficient backup that activates only when needed. This parameter change enables the system to maintain low complexity during normal operation while providing high reliability when failures occur.
3Reliability
If backup communication line is added for reliability, then system reliability is improved, but device complexity increases
Solution Approach 1:
The communication system implements dynamic operation where the third communication line serves as a standby backup that can be activated based on the operational status of the primary communication lines. This dynamic configuration allows the system to maintain simple operation during normal conditions while providing enhanced reliability when failures occur, reducing the perceived complexity during normal use.
Solution Approach 2:
The third communication line is designed as a simpler, lower-cost backup solution compared to the primary communication lines. It uses longer cycle times and less frequent communication, making it a more economical backup option that provides sufficient reliability without matching the full performance specifications of the primary lines, thus reducing overall system complexity.
Data Source
AI summary
A communication system for an electro-mechanical brake is disclosed. In one aspect, a communication system for an electro-mechanical brake (EMB) system including a brake center controller (BCC) configured to control a plurality of EMB of the EMB system and a plurality of brake wheel controllers (BWCs) disposed in each of the plurality of EMB, the communication system comprises a first communication line configured to connect the BCC to each of BWCs corresponding to a first group, a second communication line configured to connect the BCC to each of BWCs corresponding to a second group, wherein the BWCs corresponding to the second group are not corresponding to the first group among the plurality of BWCs, and a third communication line configured to connect the BCC to each of BWCs corresponding to the first group and the second group.