Battery Management Data Transfer Using Derived Differential Values
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The communication bus in automotive systems, particularly in battery management systems, faces bandwidth limitations due to the high frequency of data transmission from numerous battery modules and sensor control units, leading to potential interference and reduced capacity for additional communication.
Innovation Solution
The method involves transmitting derived data, such as differences between successive measurements, instead of full measurement values, allowing the main control unit to reconstruct the original data, thereby reducing bandwidth usage and enabling more control units to communicate on the same bus without compromising accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all measurement values are transmitted at high frequency from numerous battery modules to the main control unit, then the measurement accuracy and monitoring reliability are improved, but the communication bus bandwidth is exceeded and interference increases
Solution Approach 1:
The patent extracts only the essential information (differences between successive measurement values) for transmission, leaving out the redundant data (full measurement values). This selective extraction reduces communication load while preserving the ability to reconstruct complete information at the receiving end, thereby reducing interference while maintaining monitoring reliability.
Solution Approach 2:
Instead of transmitting the complete measurement values directly, the patent inverts the approach by transmitting the differences between successive values. The main control unit then reconstructs the complete measurement values by accumulating these differences, achieving the same monitoring objective with reduced data transmission.
2Adaptability or versatility
If the number of subordinate control units is increased to monitor more battery modules, then the monitoring coverage is improved, but the communication bus bandwidth requirement increases and limits additional communication capacity
Solution Approach 1:
The patent extracts only the differential information from each subordinate control unit for transmission. This extraction approach allows numerous subordinate control units to operate simultaneously without overwhelming the communication bus, as each unit contributes minimal data (differences) rather than complete measurement sets.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary differential data rather than complete measurement values. This partial transmission approach enables scalable expansion of subordinate control units while maintaining acceptable communication bus utilization and preserving capacity for additional communication.
3Measurement precision
If the measurement frequency is increased to capture rapid changes in battery parameters, then the measurement precision is improved, but the data volume and communication load increase proportionally
Solution Approach 1:
The patent inverts the transmission approach by sending differences between successive measurements rather than the measurements themselves. This inversion maintains measurement precision for capturing rapid changes while significantly reducing data volume, as the differences between consecutive high-frequency measurements are typically much smaller and more compact.
Solution Approach 2:
The patent applies dynamics by adaptively determining the resolution for derived data as a function of the measured variable. For variables with rapid changes, higher resolution is maintained; for slowly varying variables, lower resolution suffices. This dynamic adjustment optimizes the balance between measurement precision and data volume reduction.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for data transfer between electronic control devices, a battery and a motor vehicle with such a battery, which are particularly suitable for reducing the communications load on the communications bus between a main control device and one or more subordinate control devices, particularly between control devices of a battery management system. For this purpose, a method for data transfer between electronic control devices is provided, wherein the control devices comprise at least one main control device (102) and at least one subordinate control device (104-1, 104-2,..., 104-n). Measurement values (312, 316, 320, 328, 332) are detected by the at least one subordinate control device (104-1, 104-2,..., 104-n). Derived data is formed by the at least one subordinate control device (104-1, 104-2,..., 104-n) from at least one part of the detected measurement values (312, 316, 320, 328, 332), and the derived data is transferred to at least one main control device (102).