Real-time Driveline Ratio Tracking and Filtering
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Solution Overview
Problem
The complexity of managing multiple transmission ratios and axle ratios in modern vehicles makes it difficult to maintain accurate mappings between transmission gears and driveline ratios, leading to potential inaccuracies or unusability of related truck features.
Innovation Solution
A computer system that calculates and updates driveline ratios in real-time, using current engine and vehicle speeds to determine if the driveline is engaged, and adjusts the mapping of transmission gears and respective ratios, allowing for dynamic updates and additions or removals based on stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmission ratios and axle ratios are available at manufacturing time, then vehicle performance can be optimized for different purposes, but tracking and maintaining accurate driveline ratio mappings becomes difficult
Solution Approach 1:
The patent implements dynamic updating of driveline ratio mappings by continuously monitoring engine speed and vehicle speed during operation. The system automatically detects gear changes and recalculates driveline ratios in real-time, transforming a static calibration process into a dynamic adaptive system that maintains accuracy despite configuration changes.
Solution Approach 2:
The system establishes a feedback loop where actual engine speed and vehicle speed measurements are continuously compared against expected values based on stored driveline ratio mappings. When discrepancies are detected, the system automatically updates the mappings to reflect actual conditions, ensuring ongoing accuracy without manual intervention.
2Adaptability or versatility
If transmission or axle ratio changes are made subsequently, then vehicle configuration flexibility is improved, but calibration accuracy of driveline ratio mappings deteriorates
Solution Approach 1:
The system performs self-calibration by automatically detecting when driveline ratio changes occur during vehicle operation. Through continuous monitoring of engine speed and vehicle speed relationships, the system identifies gear changes and autonomously updates the driveline ratio mappings without requiring external calibration equipment or manual intervention.
Solution Approach 2:
The patent pre-establishes a framework for automatic calibration by storing multiple potential driveline ratio configurations at manufacturing time. This preliminary preparation enables the system to quickly adapt to configuration changes by selecting and validating appropriate ratios from the pre-stored set, reducing the impact of changes on calibration accuracy.
3Measurement precision
If real-time calculation of driveline ratios is implemented, then mapping accuracy is improved, but computational requirements and system complexity increase
Solution Approach 1:
The patent extracts only the essential calculations needed for driveline ratio determination, focusing on the core relationship between engine speed and vehicle speed. By isolating and implementing only the critical computational elements rather than a comprehensive analysis system, the solution achieves accurate real-time tracking with minimal computational overhead.
Data Source
AI summary
A computer system (e.g., an on-board vehicle computer system) creates or updates a mapping of transmission gears and respective driveline ratios during operation of the vehicle. The system obtains a current engine speed and vehicle speed and calculates a current driveline ratio for the vehicle based on the current engine speed and vehicle speed. If the driveline is engaged, the system updates the mapping based at least in part on the current driveline ratio. Performing the update may include adding a new transmission gear or updating an existing transmission gear in the mapping, or removing a duplicate transmission gear from the mapping. Applications include cruise control, predictive cruise control, predictive shifting, and selecting a gear for a specific purpose (e.g., for descending a hill).