Calibration Data Storage Optimization in Automotive ECUs
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Solution Overview
Problem
Modern automobile electronic control units face memory bulkiness and complexity in managing various calibration data versions, which complicates their storage and management in vehicle assembly plants.
Innovation Solution
A method that identifies standard and variant calibration data versions, deletes common data from variants, and records a summary file with location traces, allowing for compressed storage of common and specific data, along with a header for referencing and decompression, to reduce memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple complete calibration data files are stored in memory to support various vehicle applications, then the flexibility and adaptability of the electronic control unit is improved, but the memory space required increases significantly
Solution Approach 1:
The patent segments calibration data into two distinct parts: common calibration data that is identical across all vehicle applications, and specific calibration data that varies by application. This segmentation allows the common data to be stored once and reused, while only the varying specific data needs to be stored in multiple versions, dramatically reducing memory requirements while maintaining full adaptability.
Solution Approach 2:
The patent implements a nested structure where the common calibration data file serves as a base layer, and specific calibration data files contain only the differences or variations needed for different applications. When a complete calibration set is needed, the system nests the specific data within the context of the common data, reconstructing the full calibration set on-demand without storing complete duplicate copies.
2Reliability
If complete calibration data files are stored for each vehicle application, then the reliability of calibration accuracy is improved, but the complexity of managing multiple versions increases
Solution Approach 1:
The common calibration data file serves multiple functions simultaneously: it provides the base calibration for all applications, acts as a template for generating complete calibration sets, and ensures consistency across all vehicle applications. This multi-functionality reduces the need to maintain separate complete calibration files for each application, simplifying version management while preserving calibration accuracy.
Solution Approach 2:
Instead of storing and managing multiple complete calibration data files, the patent creates simplified copies or representations of the calibration data. The specific calibration data files contain only the necessary variations, which can be copied and combined with the common data file to generate complete calibration sets for different applications, reducing management complexity.
Data Source
AI summary
A method for storing, in the rewritable memory of an automobile electronic control unit, calibration data functionally equivalent to a set of various models (M1-M5) of complete calibration data, this method including operations consisting in recording a single copy (CALIBAS) of common calibration data (COM1-COM4), and specific calibration data (SP1-SP5) relieved of these common data. The method uses the relations existing between the various versions (SP1-SP5) of specific data to further reduce the memory space dedicated to storage by defining, from among these versions, standard versions (T1; T2) and variants (V11; V21, V22), the variants being relieved of data already contained in the standard versions (T1; T2).