Hybrid Vehicle Battery Voltage Encoding via Grouping
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Solution Overview
Problem
Current methods for encoding battery cell voltages in hybrid vehicles often result in increased message size and number on the vehicle bus, making efficient data transmission challenging.
Innovation Solution
The method involves generating voltage groups and assigning validity and update measures using Karnaugh values to encode data, ensuring at least two-bit errors are removed, thereby minimizing message size and number while maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encoding methods (e.g., checksum) are used for voltage values, then data integrity is improved, but message size and number transmitted along the vehicle bus significantly increase
Solution Approach 1:
The patent segments voltage data into groups of multiple cells (e.g., 4-cell groups) and generates a single validity measure per group rather than individual checksums for each cell. This segmentation approach reduces the total number of encoding bits required while maintaining group-level data integrity verification.
Solution Approach 2:
The patent combines multiple voltage cell data into voltage groups and uses a single validity measure (encoded with 2-bit error correction capability) to protect the entire group. This merging strategy reduces overall message size compared to individual encoding of each cell while preserving reliability through group-level error detection.
2Reliability
If higher level of encoding is applied to voltage information, then data reliability is improved, but message size and transmission complexity increase
Solution Approach 1:
The patent changes the encoding parameter from individual cell-level checksums to group-level validity measures with 2-bit error correction capability. This parameter change achieves higher reliability (correcting up to 2-bit errors) while reducing overall message complexity through more efficient use of encoding bits across voltage groups.
Data Source
AI summary
A method of encoding data related to voltages for each of a plurality of battery cells for transmission in a hybrid vehicle includes the steps of generating a plurality of voltage groups, and generating a validity measure for each of the plurality of voltage groups. Each of the plurality of voltage groups comprises the voltages for a different combination of the plurality of battery cells.