Wheel Acceleration Sampling for TPMS Wheel Positioning
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Solution Overview
Problem
Current tire pressure monitoring systems (TPMS) face challenges in accurately positioning wheel sensors due to varying vehicle conditions and increased product costs associated with complex hardware configurations and installation difficulties.
Innovation Solution
A method for sampling wheel acceleration, determining rotation angular position, and positioning a target wheel, which includes acquiring real-time wheel acceleration values, calculating time intervals for sampling, and using these values to determine the rotation angular position and position the target wheel within a tire pressure monitoring system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical position fixing is used to install sensors in fixed tire positions, then sensor positioning is achieved, but production difficulty and installation labor time increase
Solution Approach 1:
The system enables sensors to automatically identify and position themselves on the correct wheels through self-learning algorithms. The sensor captures acceleration data and automatically determines wheel position information without requiring manual positioning or complex installation procedures, thereby maintaining positioning accuracy while dramatically simplifying installation
Solution Approach 2:
The patent replaces physical position fixing mechanisms with a software-based self-positioning system. Instead of using mechanical methods to固定 sensors in specific positions, the system uses acceleration sensors and algorithms to automatically determine wheel positions through data processing and pattern recognition
2Measurement precision
If low-frequency receiving antennas are configured to achieve positioning through low-frequency communication, then positioning is achieved, but installation difficulty and product costs greatly increase
Solution Approach 1:
The patent extracts the positioning function from complex hardware systems (low-frequency antennas and receivers) and implements it through a simplified sensor-based approach. By removing the need for dedicated positioning hardware and using only acceleration sensors with processing algorithms, the system achieves positioning without the complexity of low-frequency communication systems
Solution Approach 2:
The system uses acceleration patterns as a signature or fingerprint for each wheel position. By capturing and analyzing the unique acceleration characteristics of each wheel during rotation, the system creates a digital representation of wheel positions that can be identified and matched without requiring physical antennas or complex communication hardware
3Measurement precision
If field strength method is used to distinguish left and right wheels, then wheel distinction is achieved, but positioning errors occur due to varying vehicle conditions and product consistency requirements increase costs
Solution Approach 1:
The patent transitions from static field strength measurements to dynamic acceleration pattern analysis. By capturing acceleration data during wheel rotation and analyzing the temporal patterns, the system achieves reliable wheel distinction that is not affected by static vehicle conditions or positioning variations, thereby improving reliability under varying operating conditions
Solution Approach 2:
The system performs preliminary learning and characterization of each wheel's acceleration pattern during normal operation. By continuously capturing and storing the unique acceleration signatures of each wheel, the system builds a reference database that enables reliable position identification without requiring consistent field strength conditions or repeated calibration
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 technical support for accurately positioning target wheels by determining their rotation angular position, thereby enhancing the reliability and reducing the costs associated with TPMS installation and maintenance.
Implementation Method 1
a first acceleration value of the target wheel at a first moment and a second acceleration value of the target wheel at a second moment are acquired through a tire pressure monitoring device installed on the target wheel
Implementation Method 2
TPMS needs to include two acceleration sensors which point to a Z direction of a centrifugal force of the rotation of the tire and a tangential X direction of the rotation of the tire
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
A method for sampling wheel acceleration may include: acquiring a real-time wheel acceleration value of a target wheel and calculating a time length required to rotate for a preset number of revolutions of the target wheel according to a first association relationship between the wheel acceleration and the time length required to rotate for the preset number of revolutions of the target wheel (S31); obtaining a time interval between any two adjacent sampling points according to the time length required to rotate for the preset number of revolutions (S32); and sampling the wheel acceleration of the target wheel once every the time interval starting from any time (S33). The above solutions can provide technical support for realizing positioning of the target wheel.