Wheel Sensor Detachment Detection Using Hall Effect Feedback
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Solution Overview
Problem
Existing methods for detecting sensor detachment in vehicle wheels are unreliable due to variations in wheel speed during skidding or bending, leading to incorrect distance calculations and potential tire damage.
Innovation Solution
A method that acquires the angular-speed value of the wheel, measures acceleration, calculates the distance of the sensor device from the wheel center, and determines detachment by comparing the calculated distance to the assembly distance, using angular-speed sensors and accelerometers, with optional estimation using vehicle speed, steering angle, and yaw angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the method uses vehicle speed and sensor acceleration to calculate distance, then detachment detection is enabled, but the detection reliability deteriorates due to wheel speed variations during skidding or bending
Solution Approach 1:
The patent replaces the mechanical/kinematic calculation method (using vehicle speed and acceleration) with a magnetic field-based measurement system. Hall sensors mounted on the wheel hub measure the actual rotational position and speed of the wheel, providing direct feedback that is not affected by vehicle dynamics such as skidding or bending. This substitution of measurement principle resolves the contradiction by providing reliable detachment detection independent of vehicle motion conditions.
2Adaptability or versatility
If the sensor device is mounted in the wheel, then tire pressure monitoring is enabled, but the sensor device may become detached causing tire damage
Solution Approach 1:
The patent implements a feedback mechanism where Hall sensors continuously measure the rotational position of the wheel hub, and the control unit compares the measured position with expected position based on wheel rotation. When the sensor device detaches, the magnetic field reference changes, causing a detectable discrepancy in the feedback signal. This immediate feedback allows the system to detect detachment and alert the driver, preventing further tire damage while maintaining the tire pressure monitoring capability.
3Reliability
If the control unit warns the driver of pressure drop, then driving safety is improved, but false alarms may occur due to erroneous distance estimates
Solution Approach 1:
The patent replaces the indirect calculation method (which could produce erroneous results during skidding or bending) with direct magnetic field measurement using Hall sensors. The sensors measure the actual wheel hub rotation and position, providing accurate data that is not affected by vehicle dynamics. This substitution eliminates the source of erroneous information that caused false alarms, while maintaining the safety warning capability for actual pressure drops.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a reliable and efficient means to detect sensor detachment in real-time, preventing false alarms and tire damage by accurately determining the sensor's position relative to the wheel center.
Implementation Method 1
a Hall sensor is mounted on a wheel hub of the wheel and a magnet is mounted on a wheel rim of the wheel
Implementation Method 2
measuring the acceleration value of the sensor device
Data Source
AI summary
A method for detecting the detachment of a sensor device mounted in a wheel of a motor vehicle at an assembly distance from the center of the wheel. The method includes steps for acquiring (E1) the angular-speed value of the wheel, measuring (E2) the acceleration value of the sensor device, calculating (E3) the distance separating the sensor device from the center of the wheel using the angular-speed value and the acceleration value, and determining (E4) the detachment of the sensor device if the calculated distance is different from the assembly distance of the sensor device in the wheel.