On-Board Curve Fitting for OBD Data Transfer
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Solution Overview
Problem
Existing on-board diagnostics (OBD) systems for vehicles generate large amounts of data, which is difficult to efficiently transfer and store, leading to potential errors in diagnosing evaporative emission control systems due to external factors like fuel sloshing, resulting in inaccurate leak indications and inefficient data analysis.
Innovation Solution
Fitting a curve to the diagnostic data on-board the vehicle and transferring only the curve fitting parameters and start/end points to an off-board location for analysis, allowing for accurate reconstruction and analysis of the entire dataset, thereby improving data processing accuracy and reliability without increasing storage or processor requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete OBD data is transferred to off-board location, then data analysis accuracy is improved, but data transfer time and storage requirements increase
Solution Approach 1:
The patent extracts only the essential diagnostic parameters and test results from the complete OBD dataset, transferring only this condensed information to the off-board location. This extraction approach maintains diagnostic accuracy while dramatically reducing data transfer time and storage requirements.
Solution Approach 2:
The patent creates a simplified copy of the diagnostic data containing only critical parameters rather than transferring the complete dataset. This copy includes essential information needed for accurate analysis while eliminating redundant data, thus resolving the contradiction between completeness and efficiency.
2Loss of information
If complete OBD data is stored at off-board location, then data analysis capability is improved, but storage requirements increase
Solution Approach 1:
The patent extracts only the critical diagnostic parameters, test results, and essential metadata from the complete OBD dataset for storage at the off-board location. This extraction maintains full data analysis capability for diagnostic purposes while minimizing storage requirements by excluding redundant raw data.
3Productivity
If curve fitting is applied to OBD data, then data transfer efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent transforms the raw OBD data into simplified parameters through curve fitting and data condensation processes. By changing the data representation from raw time-series measurements to fitted curve parameters and key diagnostic values, the system achieves efficient data transfer while the added processing complexity is justified by the significant gains in transfer efficiency and storage optimization.
Data Source
AI summary
Methods and systems are provided for processing of an on-board diagnostic (OBD) test dataset, and transferring parameters of a curve fit to the processed data to an off-board location. In one example, a method may include performing an evaporative emissions system diagnostic test, fitting a curve to at least a part of the data, transferring parameters of the curve fit, along with the start, and end data points to an off-board location for further processing. The on-board controller may adjust engine operating conditions based on signal received from the off-board location after off-board data reconstruction, and analysis.