Bluetooth Tire Localization Using AOA for Accurate TPMS Positioning
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Solution Overview
Problem
Traditional tire pressure monitoring systems face challenges with inaccurate tire localization due to insufficient calculation speed, large localization delays, and environmental sensitivity, often resulting in incorrect alarm signals and safety hazards during long-distance driving.
Innovation Solution
A tire localization system utilizing Bluetooth 5.1 protocols with multiple antennas for angle of arrival (AOA) determination and I/Q sampling, allowing for precise orientation and positioning of tire pressure monitoring modules without requiring specific tire locations, thereby reducing installation complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional tire pressure monitoring systems use preset one-to-one correspondence between module and tire orientation, then the system structure is simple, but the installation and debugging process becomes inconvenient and error-prone
Solution Approach 1:
The system automatically identifies and localizes tires using Bluetooth signals and AOA technology without requiring manual configuration or preset correspondence. The tire pressure monitoring module autonomously determines its position and communicates with the host controller, eliminating the need for complex installation procedures and debugging processes.
Solution Approach 2:
The patent replaces the traditional mechanical presetting and manual configuration system with an automated electronic identification system. Instead of physically assigning modules to specific tire positions during installation, the system uses Bluetooth 5.1 AOA technology to automatically determine and assign tire positions based on signal characteristics.
2Measurement precision
If Bluetooth 5.1 AOA technology with multiple antennas is used for tire localization, then localization precision is improved, but device complexity increases
Solution Approach 1:
The Bluetooth module with multiple antennas serves multiple functions: it not only provides standard Bluetooth communication for data transmission but also performs AOA-based localization by analyzing signal arrival angles. This multi-functionality allows the same hardware to achieve both communication and positioning without adding separate dedicated localization devices.
Solution Approach 2:
The system utilizes the phase difference parameter of Bluetooth signals received by multiple antennas to calculate the angle of arrival. By changing from traditional RSSI-based localization to AOA-based localization using phase difference parameters, the system achieves higher precision in determining tire positions, especially in distinguishing left-right orientations.
3Reliability
If automated tire localization using AOA and RSSI is implemented, then installation errors are reduced, but computational complexity and power consumption increase
Solution Approach 1:
The tire pressure monitoring module performs AOA and RSSI measurements periodically rather than continuously. The module sends Bluetooth signals at intervals and processes localization data at these periodic moments, which significantly reduces power consumption compared to continuous operation while still achieving accurate tire position determination during the installation phase.
Data Source
AI summary
A tire localization method for a vehicle, can include: matching a first Bluetooth module in each tire of the vehicle with a second Bluetooth module of a Bluetooth host in the vehicle; acquiring first data representing a received signal strength indication of a first radio frequency signal sent by the first Bluetooth module in each tire; acquiring an angle of arrival of the first Bluetooth module in each tire relative to the second Bluetooth module; and locating each tire based on the first data and the angle of arrival.