Wireless Battery Monitoring Data Compression for ASIL D Reliability
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Solution Overview
Problem
Current Wireless Battery Management Systems (WBMS) face challenges in achieving ASIL D compliance for critical functions, particularly in reducing wireless data traffic and ensuring reliable communication across multiple battery cells in electric vehicles.
Innovation Solution
The implementation of a wireless battery management system that includes peripheral devices (PDs) and a central device (CD) with data processing units (DPUs) that compress data packets, add protection codes, and manage wireless communication to reduce data traffic and ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data packets are transmitted uncompressed over the wireless network, then data transmission speed is maintained, but wireless data traffic volume increases
Solution Approach 1:
The patent extracts and removes redundant information from battery measurement data packets before transmission. The DPU identifies and eliminates duplicate or unnecessary data elements, keeping only the essential information needed for battery monitoring, thereby reducing the volume of data transmitted over the wireless network while maintaining the integrity of critical measurements.
Solution Approach 2:
Instead of compressing data to reduce size, the patent inverts the approach by selectively removing unnecessary data elements before transmission. This inversion of the traditional compression method achieves similar space-saving effects while potentially simplifying the processing required, as removal operations can be more efficient than general compression algorithms.
2Reliability
If data packets are compressed and protection codes are added, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the data processing functionality into distinct modules within the DPU: a compression module, a protection code generation module, and a verification module. This segmentation allows each function to be independently optimized and tested, reducing overall system complexity while maintaining comprehensive data protection capabilities. Each segment handles a specific aspect of data reliability, making the complex process more manageable and verifiable.
Solution Approach 2:
The DPU performs compression and protection code addition as preliminary actions before data enters the wireless transmission channel. By preparing the data in advance with all necessary compression and protection measures, the system ensures reliability is built-in before transmission begins, rather than requiring complex real-time processing during transmission.
3Reliability
If verification checks are performed at multiple stages, then data integrity is ensured, but processing time increases
Solution Approach 1:
The patent performs verification checks as preliminary actions at the source (in the DPU before transmission) rather than waiting until data arrives at the destination. By verifying data integrity, compression correctness, and protection code validity in advance, the system ensures data integrity is established before the time-consuming wireless transmission occurs, reducing overall processing time.
Solution Approach 2:
The system implements feedback mechanisms where verification results from intermediate checks are used to immediately correct or reject problematic data packets before they enter the transmission pipeline. This feedback loop prevents erroneous data from consuming transmission resources, ensuring that only verified, intact data is transmitted, thereby maintaining high integrity without excessive retransmission delays.
Data Source
AI summary
Disclosed are methods and systems for reducing wireless data traffic in a battery management system. A wireless battery management system includes peripheral devices (PDs), each coupled to a battery module having associated battery cells and is operable to receive battery measurements from such associated cells. The system also includes a central device (CD) operable to receive battery measurements from the PDs via a wireless network. The system also includes a first data processing unit (DPU) coupled with a first one of the PDs and communicatively interposed between the first PD and the wireless network. The first DPU is operable to (i) receive a first data packet from the first PD, (ii) if the first data packet passes verification, compress the first data packet and add a protection code to the first data packet, and (iii) send the compressed first data packet with the protection code to a second DPU via the wireless network. The second DPU is coupled with the CD and communicatively interposed between the CD and the wireless network. The second DPU is operable to (i) from the wireless network, receive the compressed first data packet with the protection code, (ii) if the compressed first data packet passes verification, decompress the compressed first data packet to obtain the first data packet, and (iii) send the decompressed first data packet to the CD.