Battery Management Data Compression via Slope Deviation
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Solution Overview
Problem
The limited bandwidth of communication buses in battery management systems for electric vehicles restricts the frequency of data transmission from multiple battery modules to the primary control unit, leading to potential malfunctions and reduced connectivity of sensor control units.
Innovation Solution
A method that utilizes characteristic curves of sensor data to compress data transmission by sending the rate of change and deviations, allowing for extrapolation of future values, thereby reducing bandwidth requirements without loss of accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission frequency is increased to monitor multiple battery modules, then monitoring reliability is improved, but communication bus bandwidth is exceeded causing malfunctions
Solution Approach 1:
The patent extracts only the essential information needed for monitoring by calculating and transmitting only the difference values (deviations from expected values) rather than complete measurement data. This selective extraction of critical information reduces data traffic while maintaining monitoring reliability.
Solution Approach 2:
The patent changes the parameter representation from absolute measurement values to differential values (deviations from expected characteristic curves). This parameter transformation significantly reduces the data volume transmitted over the communication bus while preserving the ability to detect anomalies.
2Adaptability or versatility
If more sensor control units are connected to the bus, then system functionality is improved, but data transmission accuracy deteriorates due to bus loading
Solution Approach 1:
The patent extracts only the necessary deviation information from complete measurement data, transmitting only what is needed to maintain measurement precision. This allows more sensor control units to share the bus without compromising data accuracy.
Solution Approach 2:
The patent transmits only the partial information necessary for accurate monitoring (deviation values rather than complete data sets). This partial transmission approach reduces bus loading enough to support more devices while maintaining sufficient precision for safety-critical monitoring.
3Quantity of substance
If data compression is applied to reduce bandwidth requirements, then bus loading is reduced, but data transmission complexity increases
Solution Approach 1:
The patent performs preliminary calculations at the sensor control unit to determine expected values based on characteristic curves before transmission. By pre-calculating what the values should be and comparing with actual measurements, the system simplifies the compression process to only transmitting deviation values.
Solution Approach 2:
The patent introduces characteristic curves as an intermediary reference that mediates between complete measurement data and compressed transmission. These curves serve as a baseline for calculating deviations, enabling efficient compression while maintaining data integrity through the intermediary comparison process.
Data Source
AI summary
A method for compressing measurement data which is transmitted from sensor control units via a data bus to a primary control unit of a battery management system for vehicles, includes transmitting a rate of change/slope of the measurement data to the primary control unit at a start of measurements. The method further includes transmitting deviations/differences in the measurement data from a current slope, and reconstructing, without loss of information, correct measured values from the rates of change/slope and the received deviations/differences with the primary control unit.