Wireless Battery Management Watchdog Reset for Missed Slave Responses
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Solution Overview
Problem
Existing battery management systems face issues when slaves fail to respond to commands due to external noise or temporary malfunctions, leading to improper management of battery modules.
Innovation Solution
A wireless battery management system with a master-slave configuration that includes a watchdog timer to reset slaves that do not respond to commands, using main and sub command packets to identify and retransmit commands to non-responsive slaves, and adjust signal strength based on response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication is used between master and slaves for battery management, then system complexity is reduced and ease of operation is improved, but reliability deteriorates due to external noise and temporary malfunctions causing communication failures
Solution Approach 1:
The system implements a feedback mechanism where the master transmits commands to slaves and expects response packets within a threshold time. When no response is received, the master identifies the non-responsive slave and retransmits the command. This closed-loop feedback ensures reliable communication despite wireless interference.
Solution Approach 2:
The system performs preliminary actions by establishing a threshold time for response acknowledgment before communication failures are confirmed. The master proactively monitors for missing responses and prepares to retransmit commands, preventing complete communication breakdown rather than reacting after failure occurs.
2Reliability
If the master retransmits commands to all slaves to ensure reliability, then reliability is improved, but loss of time increases due to repeated transmissions
Solution Approach 1:
The system segments the slave population into responsive and non-responsive groups based on response packet acknowledgment. The master selectively retransmits commands only to identified non-responsive slaves rather than broadcasting to all slaves, reducing redundant transmissions and time loss.
Solution Approach 2:
The system applies partial action by retransmitting commands to only the necessary subset of slaves that failed to respond, rather than performing excessive full retransmissions to all slaves. This minimizes time loss while ensuring all necessary slaves receive commands.
3Productivity
If timeout threshold is set short to quickly detect non-responsive slaves, then productivity is improved, but reliability worsens due to premature detection of temporarily delayed slaves
Solution Approach 1:
The system uses parameter changes by dynamically adjusting the threshold time based on communication conditions. The threshold is set long enough to accommodate temporary delays but short enough to detect genuine failures, optimizing the balance between quick detection and accurate identification.
Data Source
AI summary
A wireless battery management system according to the present disclosure includes a master to wirelessly transmit a main command packet every reference time, and a plurality of slaves. Each slave wirelessly transmits a response packet including an ID of each slave when receiving the main command packet. The master classifies, as a first group, each slave to which the ID included in each response packet received within a threshold time from a time point at which the main command packet was transmitted is allocated, and each of the remaining slaves as a second group. Each slave initializes a time count of a watchdog timer provided in each slave when receiving the main command packet. Each slave is reset by the watchdog timer when the time count of the watchdog timer reaches a timeout that is equal to or less than the reference time.