TPMS Wheel Position Detection Using Acceleration Phase Lag
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Solution Overview
Problem
Current tire pressure monitoring systems (TPMS) face challenges in accurately determining left and right wheel positions, leading to increased production difficulties, maintenance costs, and power consumption, due to the need for precise sensor configuration and high-frequency antenna requirements.
Innovation Solution
A method using acceleration sensors to determine wheel position by analyzing the overrun-lag relationship between centrifugal and tangential acceleration, allowing for low-accuracy sensors and reduced power consumption, with the system including a pressure sensor, acceleration sensor, controller, and RF transmitter to send positioning data to a vehicle processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-frequency communication components and receiving antennas are configured for positioning, then wheel position determination can be achieved, but configuration difficulty and production costs increase significantly
Solution Approach 1:
The patent extracts the positioning function from complex communication hardware (low-frequency antennas and receivers) and implements it using simple acceleration sensors that detect wheel rotation characteristics. This removes the disturbing complex communication components while retaining the essential positioning capability through analysis of acceleration data patterns.
Solution Approach 2:
The patent replaces the electromagnetic field-based low-frequency communication system with a mechanical sensing approach using acceleration sensors. Instead of using radio frequency signals for positioning, the system uses mechanical acceleration measurements during wheel rotation to determine wheel identity, achieving the same positioning function with simpler components.
2Ease of operation
If manual learning and coding operations are performed through handheld learners, then sensor identifiers can be written to receiving end, but product costs and maintenance costs increase
Solution Approach 1:
The patent enables the system to automatically determine wheel positions through self-service mechanisms. The acceleration sensors automatically detect and analyze wheel rotation characteristics without requiring external handheld learners or manual coding operations. The system autonomously identifies wheel identities based on the patterns detected during normal operation, eliminating the need for manual configuration services.
Solution Approach 2:
The patent performs preliminary positioning analysis during the wheel rotation detection phase itself. Rather than requiring separate manual learning sessions after assembly, the system captures and analyzes acceleration data during normal wheel operation to pre-determine wheel identities, eliminating the need for subsequent manual configuration steps.
3Measurement precision
If four distinct sensors are physically fixed at fixed positions on each wheel for positioning, then wheel position can be determined, but production difficulty and maintenance costs increase
Solution Approach 1:
The patent makes the acceleration sensors universal by enabling them to perform both pressure monitoring and positioning functions. Instead of requiring separate dedicated positioning sensors at fixed locations, the same acceleration sensors used for monitoring wheel dynamics can also determine wheel identity through analysis of rotation characteristics, reducing the total number of components needed.
Solution Approach 2:
The patent merges the positioning function with the pressure monitoring function into a single integrated sensor system. The acceleration sensors simultaneously perform both pressure detection and position determination by analyzing the same wheel rotation data, combining multiple functions into unified components to simplify production and reduce part counts.
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
Enables accurate wheel position determination with low-accuracy sensors, reducing production and maintenance costs while minimizing power consumption, and simplifying the configuration process.
Implementation Method 1
sampling centrifugal acceleration and tangential acceleration of the wheel within the time duration
Implementation Method 2
sampling centrifugal acceleration and tangential acceleration of the wheel within the time duration
Data Source
AI summary
The present disclosure provides a left and right wheel determination method, a wheel pressure monitoring chip and system, and related apparatuses. The left and right wheel determination method includes: obtaining a time duration for a wheel to rotate for a predetermined number of revolutions after the wheel being detected as rotating; sampling centrifugal acceleration and tangential acceleration of the wheel within the time duration; determining an overrun-lag relationship between the centrifugal acceleration and the tangential acceleration of the wheel based on a serial number of a sampling time-point corresponding to the centrifugal acceleration and a serial number of a sampling time-point corresponding to the tangential acceleration; and determining the wheel to be of a left wheel or a right wheel based on the overrun-lag relationship between the centrifugal acceleration and the tangential acceleration of the wheel.