Extraction of tire characteristics combining direct TPMS and tire resonance analysis
First Claim
1. A tire characterization system, comprising:
- a sensor configured to provide a wheel speed signal;
a direct tire pressure monitoring system (TPMS) including at least one sensor configured to provide a direct measurement of a characteristic of the tire; and
a processing unit configured to process the wheel speed signal to identify at least one tire vibration mode and use the identified at least one tire vibration mode and the direct measurement to estimate a characterized parameter of the tire.
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Abstract
Embodiments relate to tire characterization systems and methods for combining direct tire pressure monitoring systems (TPMS) and tire resonance analysis in indirect tire pressure monitoring systems (TPMS) for the extraction of tire characteristics to characterize other tire parameters. In embodiments, iTPMS and methods that utilize anti-lock braking system (ABS) sensed signals coupled to an electronic control unit (ECU) that may comprise circuitry and/or controllers to process the sensed signals using a resonance frequency analysis (RFA) technique can be combined with direct tire pressure sensor measurements from direct TPMS systems. Because direct TPMS systems deliver a precise value of a tire characteristic (for example, tire pressure), one of the unknown parameters that influence the resonance effects can be removed. As a results, the detected resonance can be used to characterize another tire parameter that would not be accessible without knowledge of the precise value of the tire characteristic delivered by the direct TPMS system.
32 Citations
20 Claims
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1. A tire characterization system, comprising:
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a sensor configured to provide a wheel speed signal; a direct tire pressure monitoring system (TPMS) including at least one sensor configured to provide a direct measurement of a characteristic of the tire; and a processing unit configured to process the wheel speed signal to identify at least one tire vibration mode and use the identified at least one tire vibration mode and the direct measurement to estimate a characterized parameter of the tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of characterizing at least one parameter of a vehicle tire, the method comprising:
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obtaining at a processing unit data representative of a wheel speed of the tire from a sensor; analyzing the data using the processing unit; obtaining at the processing unit a direct measurement from at least one sensor corresponding to an unknown parameter; incorporating the direct measurement into the analyzed data to remove the unknown parameter using the processing unit; and characterizing a parameter of the vehicle tire using the analyzed data that incorporated the direct measurement using the processing unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A tire characterization system comprising:
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at least one sensor configured to provide at least a direct measurement of a characteristic of the tire; a wheel speed sensor configured to provide a wheel speed signal; and an electronic control unit (ECU) coupled to the wheel speed sensor and configured to; process the wheel speed signal, to identify at least one tire vibration mode associated with the processed wheel speed signal, and process the direct measurement and the identified at least one tire vibration mode in order to estimate a characterized parameter of the tire. - View Dependent Claims (19, 20)
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Specification