Radial Acceleration Sensor Position Determination
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Solution Overview
Problem
Current methods for determining the position of a radial acceleration sensor in a motor vehicle wheel are either complex and expensive or lack precision, especially when the vehicle is not moving at a constant speed, leading to errors in identifying the source of transmitted signals.
Innovation Solution
A method that involves acquiring signals during different time windows while the vehicle is in motion, detecting local extrema, determining the frequency of wheel rotation, low-pass filtering, and calculating the radial distance of the sensor from the wheel axis using filtered values and frequencies, allowing for precise positioning independent of vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the position of the radial acceleration sensor is determined by programming or manual recording, then the system is simple to implement, but the process becomes fiddly and time-consuming requiring operator intervention when wheels are changed or swapped
Solution Approach 1:
The system performs self-calibration by automatically determining the radial distance of the acceleration sensor from the wheel axis using signals acquired during vehicle motion. The microprocessor analyzes the radial acceleration signals to extract wheel rotation frequency and calculates the sensor position without requiring external operator intervention, making the system self-sufficient when wheels are changed or swapped.
Solution Approach 2:
The system dynamically determines sensor position parameters by analyzing changes in radial acceleration signals during vehicle motion. By measuring the relationship between signal amplitude, wheel rotation frequency, and radial distance, the system calculates the correct sensor position parameter automatically, eliminating the need for manual programming or recording of fixed position data.
2Device complexity
If simplified models are used to determine sensor position during high-speed steady-state motion, then the calculation is simpler, but the precision of sensor position determination is greatly limited
Solution Approach 1:
The system transitions from static fixed-position assumptions to dynamic determination of sensor position. By continuously analyzing radial acceleration signals during vehicle motion and calculating the relationship between signal characteristics and wheel rotation, the system adapts to actual sensor positions regardless of vehicle speed or motion state, achieving both operational simplicity and high precision.
3Ease of manufacture
If the system relies on fixed position data programmed in memory, then the initial setup is straightforward, but the data becomes outdated when wheels are replaced with different sizes requiring updates
Solution Approach 1:
The system performs preliminary automatic calibration by determining sensor position parameters during the first drive cycle after wheel installation. The microprocessor analyzes radial acceleration signals to establish the correct position data specific to the installed wheel configuration, preparing the system for accurate wheel identification before normal operation begins.
Solution Approach 2:
The system continuously monitors radial acceleration signals and compares measured wheel characteristics with stored reference data. When discrepancies indicate wheel changes, the system automatically recalibrates by analyzing new signal patterns to determine updated sensor position parameters, providing real-time feedback adaptation to maintain accuracy across different wheel configurations.
Data Source
AI summary
A method for determining the position of a radial acceleration sensor of a wheel of a motor vehicle, including: acquiring, by the sensor, signals Si which are acquired during a predetermined time window Wi when the vehicle is in motion, the windows Wi being different from one another; detecting, for each time window Wi, local extrema of the signal Si; determining, for each time window Wi, a frequency Fi of the rotation of the wheel of the vehicle as a function of the phase values and of the detection instants for the local extrema detected; filtering of the signals Si, so as to obtain, for each time window Wi, a filtered value Zi; and determining the radial distance Rc between the radial acceleration sensor and the axis of rotation of the wheel.