Wheel Speed Signal Self-Calibration for Non-OEM Tire Mismatch
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Solution Overview
Problem
The installation of non-original equipment manufacturer (OEM) tires on vehicles, such as trucks and off-road SUVs, leads to errors in wheel speed signals, affecting brake and chassis controls and speedometer accuracy, posing a safety hazard due to mismatched tire sizes and reduced effectiveness of vehicle stability control.
Innovation Solution
A method and system for self-calibrating wheel speed signals by measuring actual wheel speeds, detecting errors, calculating correction factors, and applying them to individual wheel speed signals using a recalibration module, with reference speeds based on engine RPM and factory tire diameters, and adjusting electronic stability control thresholds as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-OEM tires with larger diameter are installed to improve off-road capabilities, then off-road performance is improved, but wheel speed signal accuracy deteriorates causing brake and chassis control malfunction
Solution Approach 1:
The system dynamically changes the wheel speed signal parameters by applying a correction factor that adjusts the measured wheel speed based on the actual tire diameter. This allows the system to accommodate different tire sizes (OEM and non-OEM) while maintaining accurate speed signals for brake and chassis controls.
Solution Approach 2:
The system performs self-calibration by automatically detecting the tire diameter mismatch and calculating the appropriate correction factor without requiring manual intervention. The microprocessor continuously monitors wheel speed signals and adjusts the correction factor to maintain accuracy under varying tire conditions.
2Adaptability or versatility
If wheel speed sensors are made adjustable to accommodate non-OEM tires, then adaptability improves, but system complexity and ease of operation worsen due to driver awareness and knowledge requirements
Solution Approach 1:
The system eliminates the need for driver intervention by automatically detecting tire diameter mismatches and calculating correction factors. The microprocessor-based system self-calibrates by comparing expected wheel speeds (based on vehicle speed and gear) with actual sensor readings, then applies the appropriate correction without requiring driver knowledge or action.
Solution Approach 2:
The patent replaces manual mechanical adjustment of wheel speed sensors with an electronic correction system. Instead of physically adjusting sensor positions or configurations, the system uses software-based correction factors applied to the digital wheel speed signals, simplifying operation while maintaining adaptability.
3Measurement precision
If correction factors are applied to wheel speed signals to maintain accuracy, then measurement precision improves, but device complexity increases due to recalibration module requirements
Solution Approach 1:
The microprocessor performs multiple functions: it controls engine management, monitors transmission gear, calculates vehicle speed, and applies wheel speed correction factors. By consolidating these functions in a single microprocessor-based control system, the patent avoids adding separate dedicated hardware for each function, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The system introduces a correction factor as an intermediary element between the raw wheel speed sensor signal and the control systems that use this data. This correction factor acts as a software-based mediator that adjusts the signal without requiring complex hardware modifications, simplifying the overall system architecture while maintaining precision.
4Stability of the object's composition
If ESC rollover control thresholds are modified to accommodate increased CG height from larger tires, then vehicle stability improves, but measurement precision requirements increase for detecting rollover conditions
Solution Approach 1:
The system dynamically changes the ESC rollover control thresholds based on the detected tire diameter and calculated correction factor. When larger non-OEM tires are detected, the system automatically adjusts the rollover thresholds to account for the increased center of gravity height, maintaining vehicle stability while adapting to the modified vehicle configuration.
Data Source
AI summary
Systems and methods for self-calibrating wheel speed signals are provided. The method may comprise measuring, using one or more wheel speed sensors of a vehicle, a wheel speed for one or more wheels of the vehicle, detecting, using a detection module, an initial wheel speed error by comparing a measured wheel speed against a reference wheel speed, generating a wheel speed signal for each of the one or more wheels, calculating, using a recalibration module, a correction factor for each of the one or more wheels to apply to each wheel speed signal, and applying, for each of the one or more wheels, the correction factor to the wheel speed signal by multiplying each wheel speed by a corresponding correction factor.