Wheel Localization Using Tangential Acceleration Sensors
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Solution Overview
Problem
Existing Tire Pressure Monitoring Systems (TPMS) face limitations in localization accuracy and efficiency, particularly at high speeds, due to the use of radial acceleration sensors which saturate and require complex calibration, and are costly for after-market installation.
Innovation Solution
The system employs tangential acceleration sensors to determine wheel rotational speed, which are not limited by speed and do not require calibration, using a detector to measure tangential acceleration and an antilock braking system unit to provide angular rotations, allowing for accurate localization and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radial acceleration sensors are used to determine wheel rotational speed, then localization information can be obtained, but the sensors saturate at high speeds and require complex calibration
Solution Approach 1:
The patent changes the measurement parameter from radial acceleration to tangential acceleration. This parameter change eliminates the saturation problem at high speeds and removes the need for complex calibration, while maintaining localization accuracy through correlation with ABS rotational frequency data
Solution Approach 2:
The patent substitutes the radial acceleration sensing mechanism with a tangential acceleration sensing mechanism. This mechanical substitution resolves the saturation issue inherent in radial sensors at high speeds and eliminates calibration requirements
2Measurement precision
If radial acceleration sensors are used for wheel localization, then position determination is possible, but the system becomes costly for after-market installation
Solution Approach 1:
The patent makes the tangential acceleration sensor serve multiple functions: it determines wheel rotational speed for localization and can also contribute to vehicle dynamics information. This multi-functionality reduces the need for separate specialized sensors, lowering installation costs for after-market applications
Solution Approach 2:
The patent enables the sensor system to utilize existing vehicle data infrastructure (ABS system rotational frequency measurements) to support the localization function, reducing the need for additional expensive hardware and simplifying installation
3Measurement precision
If tangential acceleration sensors are used to determine rotational speed, then accurate localization is achieved, but energy consumption increases
Solution Approach 1:
The patent implements periodic measurement and correlation of tangential acceleration data with ABS rotational frequency data at appropriate intervals during wheel rotation. This periodic action maintains localization accuracy while minimizing continuous energy consumption compared to constant high-frequency sampling
Solution Approach 2:
The patent uses feedback from the correlation between tangential acceleration measurements and ABS rotational frequency measurements to confirm accurate localization. This feedback mechanism ensures precision while allowing the system to operate efficiently by only processing data when correlation confirms valid localization information
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 cost-effective and energy-efficient wheel localization up to high speeds without the need for complex calibration, providing accurate position determination and reducing battery consumption.
Implementation Method 1
a detector (12) configured to provide an acceleration signal, comprising information related to a tangential acceleration of the at least one wheel (70) of the vehicle
Data Source
AI summary
Embodiments can provide a system, a wheel localizer, a wheel localization device, a method or a computer program for locating a position of wheel and/or for determining an acceleration of a wheel of a vehicle. The system for locating a position of at least one out of a plurality of wheels of a vehicle includes a detector configured to obtain information related to a tangential acceleration of the at least one wheel of the vehicle and a unit configured to obtain information related to angular rotations of the plurality of wheels. The system further includes a locator configured to determine the position of the at least one wheel based on the information related to the tangential acceleration of the at least one wheel and the information related to the angular rotations of the plurality of wheels.