Magnetometer Wheel Rotation Sensing for TPMS Localization
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Solution Overview
Problem
Existing tire pressure monitoring systems (TPMS) face challenges in accurately localizing wheel rotation due to high power consumption and low accuracy, especially when road surfaces are uneven, leading to noise in gravity acceleration sensor measurements.
Innovation Solution
The use of a magnetometer to sense magnetic force information, processing it to obtain relative magnetic force information that does not change with the geomagnetic field but only with the wheel's rotation angle, allowing for accurate calculation of wheel rotation angles with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravity acceleration sensors are used to measure wheel rotation, then wheel rotation information can be obtained, but measurement accuracy deteriorates on uneven road surfaces due to noise
Solution Approach 1:
The patent replaces gravity acceleration sensors (mechanical/physical sensing) with magnetometers (magnetic field sensing) to detect wheel rotation. This substitution eliminates sensitivity to road surface conditions, as magnetic field measurements are not affected by mechanical vibrations or gravitational variations caused by uneven roads.
Solution Approach 2:
The patent introduces magnetic field information as an intermediary to indirectly measure wheel rotation. Instead of directly measuring acceleration (which is noisy on uneven roads), the system uses magnetic field changes caused by wheel rotation to derive rotation information, filtering out road surface noise through this intermediate measurement approach.
2Measurement precision
If traditional wheel rotation sensing methods are used, then wheel rotation information can be obtained, but power consumption increases
Solution Approach 1:
The patent replaces traditional acceleration-based sensing systems with magnetometer-based sensing. Magnetometers consume less power while providing accurate wheel rotation information, as they can detect magnetic field changes passively without requiring high-energy processing or frequent high-rate sampling.
Solution Approach 2:
The patent changes the measurement parameter from gravity acceleration to magnetic field strength. This parameter change enables lower power consumption because magnetic field measurements can be performed with lower sampling rates and less computational processing while maintaining measurement accuracy.
3Measurement precision
If direct tire pressure monitoring with sensors in tires is used, then accurate tire pressure and temperature can be monitored, but device complexity and power consumption increase
Solution Approach 1:
The patent makes the magnetometer serve multiple functions: it simultaneously provides wheel rotation information for tire pressure monitoring and wheel localization information. This multi-functionality reduces overall system complexity compared to having separate sensors for each function.
Solution Approach 2:
The patent combines wheel rotation sensing and wheel localization functions into a single magnetometer-based system. By merging these functions, the system reduces the number of separate sensors and processing channels needed, thereby reducing device complexity while maintaining monitoring accuracy.
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 method provides high-accuracy wheel rotation angle information with lower power consumption, enabling precise automatic wheel localization and improving the reliability of tire pressure monitoring systems.
Implementation Method 1
sensing magnetic force information in an environment of a wheel by a magnetometer to obtain measured magnetic force information
Implementation Method 2
generating relative magnetic force information by performing mathematical operation processing in accordance with the measured magnetic force information
Data Source
AI summary
A method of sensing wheel rotation can include: sensing magnetic force information in an environment of a wheel by a magnetometer to obtain measured magnetic force information; generating relative magnetic force information by performing mathematical operation processing in accordance with the measured magnetic force information, where the relative magnetic force information does not change with geomagnetic field and does change with a rotation angle of a wheel; and obtaining angle information related to the rotation angle of the wheel in accordance with the relative magnetic force information.