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17 May 2013 Load optimised piezoelectric generator for powering battery-less TPMS
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Proceedings Volume 8763, Smart Sensors, Actuators, and MEMS VI; 87631K (2013)
Event: SPIE Microtechnologies, 2013, Grenoble, France
The design of a piezoelectric device aimed at harvesting the kinetic energy of random vibrations on a vehicle’s wheel is presented. The harvester is optimised for powering a Tire Pressure Monitoring System (TPMS). On-road experiments are performed in order to measure the frequencies and amplitudes of wheels’ vibrations. It is hence determined that the highest amplitudes occur in an unperiodic manner. Initial tests of the battery-less TPMS are performed in laboratory conditions where tuning and system set-up optimization is achieved. The energy obtained from the piezoelectric bimorph is managed by employing the control electronics which converts AC voltage to DC and conditions the output voltage to make it compatible with the load (i.e. sensor electronics and transmitter). The control electronics also manages the sleep/measure/transmit cycles so that the harvested energy is efficiently used. The system is finally tested in real on-road conditions successfully powering the pressure sensor and transmitting the data to a receiver in the car cockpit.
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D. Blažević, E. Kamenar, and S. Zelenika "Load optimised piezoelectric generator for powering battery-less TPMS", Proc. SPIE 8763, Smart Sensors, Actuators, and MEMS VI, 87631K (17 May 2013);

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