Battery Management Bus Data Compression Using Derived Module Values
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Solution Overview
Problem
The communication load on the communication bus between electronic control devices and a battery management system in electric vehicles is high due to the need to transmit large amounts of measurement data from multiple battery modules, limiting bandwidth and increasing the risk of interference and faults.
Innovation Solution
The method involves transmitting derived data, such as average values and deviations, from subordinate control units to the main control unit, allowing for data compression without loss of accuracy, thereby freeing up bandwidth for additional communication and reducing bus utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all raw measurement data from numerous battery modules is transmitted at high frequency, then measurement accuracy is maintained, but communication bus bandwidth is exceeded and interference increases
Solution Approach 1:
The patent extracts only the essential information from raw measurement data by calculating mean values and deviations for groups of measurement values. Instead of transmitting all raw data, only the derived mean values and selected deviation values are transmitted through the communication bus, significantly reducing data volume while preserving measurement accuracy.
Solution Approach 2:
The patent transforms the original measurement parameters by deriving new parameters (mean values and deviations) from the raw measurement data. This parameter transformation allows the system to convey the same information content with fewer data points, reducing communication bandwidth requirements while maintaining measurement precision.
2Reliability
If data transmission frequency is increased to monitor all battery modules, then system reliability is improved, but communication bus load increases and bandwidth is limited
Solution Approach 1:
The subordinate control units perform preliminary processing of measurement data before transmission, calculating mean values and deviations in advance. This preliminary action reduces the data volume that needs to be transmitted and processed by the main control unit, enabling higher transmission frequencies without overwhelming the communication bus or processing capacity.
Solution Approach 2:
The patent segments the battery management system into subordinate control units that each handle specific battery modules. Each subordinate unit independently processes and compresses data from its assigned modules, then transmits only the compressed results to the main control unit. This segmentation distributes the processing load and reduces overall communication bus utilization.
3Object-affected harmful factors
If bandwidth on communication bus is reduced to minimize interference, then electromagnetic interference is decreased, but data transmission capacity is limited
Solution Approach 1:
The patent extracts only the critical information (mean values and selected deviation values) from the complete measurement data set. By transmitting only these extracted parameters instead of all raw measurement values, the system achieves effective data compression that reduces communication bus bandwidth requirements, thereby minimizing electromagnetic interference while maintaining sufficient data transmission capacity.
Data Source
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).