System and method for generating electric power from a rotating tire's mechanical energy using piezoelectric fiber composites
First Claim
1. A pneumatic tire assembly with integrated self-powered electronic components, said tire assembly comprising:
- a tire structure characterized by a crown having an exterior tread portion for making contact with a ground surface, bead portions for seating said tire to a wheel rim, exterior sidewall portions extending between each bead portion and the crown, and interior crown and sidewall surfaces;
an active piezoelectric fiber composite structure integrated with a selected interior portion of said tire structure;
a power conditioning module electrically coupled to said piezoelectric fiber composite structure for receiving electric energy generated therein and for generating a regulated voltage output; and
an electronics package connected to said power conditioning module such that selected functionality of said electronics package is powered by the regulated voltage output.
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Abstract
A system and corresponding method for generating electric power from a rotating tire'"'"'s mechanical energy concerns a power generation device with a piezoelectric structure and a power conditioning module. The piezoelectric structure preferably comprises a plurality of piezoelectric fibers embedded in a generally unidirectional fashion within an epoxy matrix. Such piezoelectric structure additionally comprises interdigital electrode layers on opposing sides of the fiber/epoxy matrix configuration. The piezoelectric structure is preferably mounted within a tire structure such that electric charge is generated therein as the wheel assembly moves along a ground surface. Electrode layers within the piezoelectric structure are coupled to a power conditioning module that rectifies the resultant electric current from the piezoelectric structure and stores it in an energy storage device, preferably an electrolytic capacitor. A rechargeable battery may also be provided for storing additional charge generated within the piezoelectric structure. A regulated voltage source is provided from the energy stored in the power generation device and can be used to power various electronics systems integrated within a tire or wheel assembly. An example of an integrated tire electronics system for use with the disclosed power generation device corresponds to a tire monitoring system that wirelessly transmits such information as tire pressure, temperature and identification variables to a remote receiver location.
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Citations
25 Claims
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1. A pneumatic tire assembly with integrated self-powered electronic components, said tire assembly comprising:
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a tire structure characterized by a crown having an exterior tread portion for making contact with a ground surface, bead portions for seating said tire to a wheel rim, exterior sidewall portions extending between each bead portion and the crown, and interior crown and sidewall surfaces;
an active piezoelectric fiber composite structure integrated with a selected interior portion of said tire structure;
a power conditioning module electrically coupled to said piezoelectric fiber composite structure for receiving electric energy generated therein and for generating a regulated voltage output; and
an electronics package connected to said power conditioning module such that selected functionality of said electronics package is powered by the regulated voltage output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A tire monitoring system for integration with a pneumatic tire structure designed to measure and transmit information relating to preselected tire conditions, said tire monitoring system comprising:
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an active piezoelectric fiber composite structure integrated in the pneumatic tire structure, wherein said piezoelectric fiber composite structure is characterized by a plurality of piezoelectric fibers embedded in an epoxy matrix and provided between at least two electrode layers;
a power conditioning module electrically coupled to selected electrode layers of said piezoelectric fiber composite structure for receiving electric charge generated within the piezoelectric fiber, for storing the charge in an energy storage device within the power conditioning module, and for generating a regulated voltage output;
a plurality of sensors for determining information about preselected tire conditions, wherein said sensors are powered by the regulated voltage output from said power conditioning module;
a microcontroller connected to said power conditioning module and to said plurality of sensors for processing the information received from said sensors, and for generating select information indicative of preselected tire conditions; and
an RF transmitter electrically connected to said microcontroller for receiving select information from said microcontroller, modulating the select information to a carrier signal, and transmitting the select information to a remote receiver location. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for generating power from piezoelectric materials integrated within a wheel assembly, said method comprising the following steps:
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providing an active piezoelectric fiber composite structure, wherein said active piezoelectric tire structure is characterized by a plurality of unidirectional piezoelectric fibers embedded in an epoxy matrix and provided between active electrode layers, and wherein said piezoelectric fiber composite structure is positioned along a selected location within the interior of the wheel assembly;
subjecting the wheel assembly to mechanical strain generally occurring as the wheel assembly rotates along a ground surface resulting in flexure of portions of the wheel assembly and generation of electric current within the provided piezoelectric fiber composite structure;
conditioning the electric current generated within the piezoelectric fiber composite structure; and
storing the conditioned electric current in an energy storage device such that a regulated voltage source is available for powering electronic devices associated with the wheel assembly. - View Dependent Claims (23, 24, 25)
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Specification