Wheel Positioning via TPMS and ABS Rotation Period Matching
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Solution Overview
Problem
Existing wheel positioning methods in automobiles suffer from low accuracy due to reliance on antenna consistency, which can lead to positioning errors when antenna performance changes.
Innovation Solution
A method that involves receiving RF data from a tire pressure sensor at a target angle, acquiring gear pulse information from an ABS sensor, determining the rotation period of the wheel, and comparing it with the rotation period of the tire pressure sensor to ensure a preset range match, thereby accurately determining the wheel position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheel positioning is based on received signal strength of sensor, then positioning can be performed, but positioning accuracy deteriorates when antenna performance changes
Solution Approach 1:
The patent changes the positioning parameter from signal strength (which varies with antenna performance) to rotation period (which is invariant to antenna performance). The sensor transmits signals at different rotation angles, and the system calculates the rotation period based on time differences between received signals, thereby eliminating the influence of antenna performance variations on positioning accuracy.
2Measurement precision
If antenna consistency is required for accurate positioning, then positioning accuracy can be maintained, but system complexity increases
Solution Approach 1:
The patent extracts the rotation period parameter from the signal transmission process, separating it from the antenna performance characteristics. By focusing solely on measuring the rotation period through time difference calculations rather than relying on signal strength, the system eliminates the need for antenna consistency requirements, thereby reducing system complexity while maintaining positioning precision.
3Measurement precision
If rotation period matching is performed between sensor and wheel, then positioning accuracy is improved, but measurement complexity increases
Solution Approach 1:
The sensor utilizes the wheel's own rotation motion to generate the positioning signal. By transmitting signals at specific rotation angles and using the wheel's rotation period itself as the measurement basis, the system makes the wheel self-describing - the wheel's motion characteristics directly provide the positioning information without requiring external reference signals or complex measurement apparatus.
Data Source
AI summary
The present application relates to the technical field of automobile wheel positioning, and more particularly to a wheel positioning method, a system and an electronic control unit and a tire pressure sensor. The system comprises an electronic control unit, a tire pressure sensor and an ABS sensor. Embodiments of the present application provide the wheel positioning method, the system, the electronic control unit, and the tire pressure sensors to improve the accuracy of wheel positioning.