TPMS Wheel Position Identification via Acceleration Overrun-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, particularly due to the need for high-accuracy sensors and complex configuration methods.
Innovation Solution
A method using acceleration sensors to determine wheel positions by analyzing the overrun-lag relationship between centrifugal and tangential accelerations, allowing for low-accuracy sensors and reduced power consumption, with the system including a pressure sensor, acceleration sensor, controller, and RF transmitter to identify and transmit wheel positions and pressure data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-frequency communication components 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 low-frequency communication systems and implements it using simple acceleration sensors that detect centrifugal and tangential acceleration patterns. This removes the need for specialized low-frequency communication components and their complex configuration, while still achieving accurate wheel position determination through analysis of acceleration signal characteristics
Solution Approach 2:
The patent replaces the mechanical/communication-based positioning system with a physics-based acceleration sensing system. By substituting low-frequency communication components with acceleration sensors that exploit the physical principles of centrifugal and tangential acceleration during wheel rotation, the system achieves positioning without complex configuration
2Measurement precision
If manual learning and coding operations are performed for positioning, then sensor identification can be achieved, but product costs and maintenance costs increase
Solution Approach 1:
The system performs self-identification of wheel positions through automatic analysis of acceleration signal patterns. The controller automatically determines which sensor corresponds to which wheel by analyzing the characteristic centrifugal and tangential acceleration patterns without requiring manual intervention, learning devices, or code writing operations, thereby reducing production and maintenance costs
3Measurement precision
If high-accuracy sensors are used for wheel position determination, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent changes the operational parameters of the sensors by utilizing the natural acceleration patterns (centrifugal and tangential) that occur during wheel rotation. By analyzing these inherent motion parameters rather than requiring high-precision static sensors, the system achieves accurate positioning with low-power consumption sensors
4Measurement precision
If physical fixed positioning is implemented with distinct sensors for each wheel, 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 identical sensors to be used on any wheel position. Through automatic identification based on acceleration pattern analysis, the same sensor hardware can be installed on any wheel and will automatically determine its position, eliminating the need for distinct pre-configured sensors for each wheel location and simplifying production and maintenance
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
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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.