TPMS Sensor Auto-Location Using ABS Rotation Signals
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Solution Overview
Problem
Existing tire pressure monitor systems with wireless positioning require significant host modifications to determine tire locations, making them inconvenient for users.
Innovation Solution
An Active Tire Auto-Location system that uses wheel axle rotation detection devices and tire pressure monitor sensors to determine tire positions without additional host modifications by comparing rotation information from a toothed ring with the ABS wheel speed sensor, utilizing a host with a transceiver and memory module, and processing modules to calculate tire positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless positioning systems are added to tire pressure monitor sensors, then tire location determination capability is improved, but host system complexity increases
Solution Approach 1:
The patent introduces an intermediary calculation method that uses the existing ABS wheel speed sensor data as a mediator to determine tire positions. Instead of directly adding complex wireless positioning hardware to the host, the system uses the toothed ring rotation information from the ABS system as an intermediary to calculate and identify tire locations, thereby achieving positioning without significantly increasing host complexity.
Solution Approach 2:
The tire pressure monitor sensor performs self-positioning by autonomously calculating its location based on rotation information comparison. The sensor itself compares the toothed ring rotation information received from the host with its own measured rotation data, automatically determining which wheel it is mounted on without requiring external configuration or complex host processing.
2Ease of operation
If wireless positioning function is implemented, then convenience of replacing sensors is improved, but modification requirements increase
Solution Approach 1:
The patent extracts the positioning calculation function from the host system and places it in the tire pressure monitor sensor itself. By taking out the complex calculation requirements from the host and implementing them in the sensor, the system maintains ease of sensor replacement while minimizing host modification requirements.
Solution Approach 2:
The system uses the existing ABS wheel speed sensor infrastructure for a dual purpose: both its original braking function and as a positioning reference. The toothed ring that already exists for ABS functionality is also used to provide rotation information for tire position determination, thereby achieving positioning without adding dedicated positioning hardware.
3Measurement precision
If factory programming method is used for tire detector identification, then identification accuracy is improved, but reconfiguration convenience deteriorates
Solution Approach 1:
The patent transforms the static factory-programming approach into a dynamic self-identifying system. Instead of fixed identification codes written at the factory, the system dynamically determines tire positions through real-time comparison of rotation information, allowing the identification to adapt automatically when sensors are moved or replaced without requiring reprogramming.
Data Source
AI summary
The present invention provides an Active Tire Auto-Location systems for tire pressure monitor sensors and an operating method. The system includes a host, wheel axle rotation detection devices and tire pressure monitor sensors. By allowing the wireless tire pressure detector to receive and compare the rotation information of a toothed ring from the wheel axle rotation detection device and the tire rotation information from the wireless tire pressure detector, each wireless tire pressure detector can identify which wheel axle rotation detection device that corresponds to it. At the same time, the tire position where each wireless tire pressure detector is situated can also be determined. Compared to prior art, it is still possible for the present invention to determine the tire position where each wireless tire pressure detector is situated, without the need for additional modification to the host, thus significantly reducing the inconvenience in replacing tire pressure monitor sensors.