Wheel Localization via Magnetic Field and Angular Rotation
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Solution Overview
Problem
Conventional Tire Pressure Monitoring Systems (TPMS) using acceleration sensors face limitations in accuracy and energy efficiency, particularly at higher vehicle speeds, due to noise interference and the need for complex algorithms and costly components, which restrict their operational speed and increase energy consumption.
Innovation Solution
The implementation of a magnetic field sensor that detects changes in the magnitude of a reference magnetic field to determine rotational speed or frequency of the wheel, allowing for more accurate and efficient wheel localization up to higher speeds without the need for absolute acceleration information or complex calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration sensors are used for wheel localization, then the system can determine wheel position, but the accuracy deteriorates at higher speeds due to noise interference and limited dynamic range
Solution Approach 1:
The patent replaces the mechanical acceleration sensor system with a magnetic field sensor system. The magnetic field sensor detects changes in the Earth's magnetic field as the wheel rotates, generating phase information without being subject to the same acceleration limitations. This substitution eliminates the fundamental constraint of acceleration sensors on vehicle speed, allowing accurate wheel localization at speeds exceeding 180 km/h.
2Speed
If acceleration sensors with extended dynamic range are used to handle high-speed centrifugal forces, then the speed range is extended, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical acceleration sensor system with a magnetic field sensor system. The magnetic field sensor detects changes in the Earth's magnetic field as the wheel rotates, generating phase information without being subject to the same acceleration limitations. This substitution eliminates the fundamental constraint of acceleration sensors on vehicle speed, allowing accurate wheel localization at speeds exceeding 180 km/h.
3Measurement precision
If acceleration sensors are used for wheel localization, then the system can determine wheel position, but energy consumption increases due to oversampling and complex algorithms
Solution Approach 1:
The patent replaces the mechanical acceleration sensor system with a magnetic field sensor system. The magnetic field sensor detects changes in the Earth's magnetic field as the wheel rotates, generating phase information without being subject to the same acceleration limitations. This substitution eliminates the fundamental constraint of acceleration sensors on vehicle speed, allowing accurate wheel localization at speeds exceeding 180 km/h.
4Measurement precision
If DC offset subtraction and robust optimization algorithms are applied to acceleration data, then the localization accuracy is maintained, but computational resources and processing time increase
Solution Approach 1:
The patent replaces the mechanical acceleration sensor system with a magnetic field sensor system. The magnetic field sensor detects changes in the Earth's magnetic field as the wheel rotates, generating phase information without being subject to the same acceleration limitations. This substitution eliminates the fundamental constraint of acceleration sensors on vehicle speed, allowing accurate wheel localization at speeds exceeding 180 km/h.
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 enables robust, cost-effective, and energy-efficient wheel localization up to vehicle speeds of at least 300 km/h, improving accuracy and reducing computational and energy demands compared to conventional accelerometer-based systems.
Implementation Method 1
a magnetic field sensor that detects changes in the magnitude of a reference magnetic field to determine rotational speed or frequency of the wheel
Data Source
AI summary
Embodiments may provide a system, a wheel localizer, a wheel localization device, or methods for locating a position of at least one wheel out of a plurality of wheels of a vehicle. In one embodiment, a system comprises a detector that obtains information related to a reference magnetic field in which the at least one wheel rotates, an antilock braking system (ABS) unit that obtains information related to angular rotations of the plurality of wheels, and a locator that determines the position of the at least one wheel based, at least in part, on the information related to the reference magnetic field and the information related to the angular rotations of plurality of wheels, where the position comprises a wheel location from among the plurality of wheels. The reference magnetic field may be the earth's magnetic field.