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THESIS1 Defense

A Vibration-Based Piezoelectric Energy Harvesting From Automobile Engine for Added Electric Charge to the Battery

Anne Vera Candelaria

on 14 October 2012

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Transcript of THESIS1 Defense

A Vibration-Based
Piezoelectric Energy
Harvesting From Automobile
Engine for Added Electric
Charge to the Battery CANDELARIA.QUEBRAL.VILLEGAS U12 Background of the Study Statement of the Problem Objectives Scope and Delimitation Significance of the Study energy harvested from piezoelectric materials is far too small to power an electronic device

batteries used in automobiles has finite lifespan

the charging circuit of a battery. General Objectives

To design and implement a system that can harvest energy sufficient for extending the life of an automobile battery.

Specific Objectives

To acquire data from vibrations produced by a car engine and relate it with the piezoelectric material output.

To design a harvesting circuit using multiple piezoelectric transducers.

To successfully convert the AC output of the piezoelectric material into DC using the rectifier circuit.

To seek the best set-up for a Piezoelectric transducer to be an efficient source energy. This study seeks to implement piezoelectric energy harvesting from the engine vibration in automobile

This study seeks to extend the life span of an automobile battery using the piezoelectric energy harvested from the vibration of the automobile this study will cover the following:

measurement of the vibration produced by the engine of an automobile.

harvesting the energy from the vibration of motor using piezoelectric material

using a rectifier circuit to convert AC to DC

using a DC-DC converter to increase the low output voltage of piezo material

some equipments to be used:

Honda GX 35 single cylinder gasoline

lead acid battery


this study will not cover the use of a brand new automobile battery to avoid overcharging causing the battery to leak out harmful acid. Piezoelectric has become one of the most promising sources of renewable energy.

It can be used to transfer mechanical energy, usually ambient vibration, into electrical energy that can be stored and used to power electronic devices.

In mechanical systems, vibrations cannot be avoided.

The researchers decided to adapt the concept of piezoelectric energy harvesting.
Piezoelectric Energy Harvesting The piezoelectric effect converts mechanical strain into electric current or voltage.

This strain can come from many different sources. Human motion, low-frequency seismic vibrations, and acoustic noise are everyday examples.

Except in rare instances the piezoelectric effect operates in AC requiring time-varying inputs at mechanical resonance to be efficient. Conceptual Framework because vibration is always present in machines and biological systems, it could be use as a source and utilize its vibration using piezoelectric materials to produce energy

using rectifier for converting the output of piezoelectric from AC to DC output to charge the battery

the development of energy efficient technologies on automobile because of increasing of oil price and growing concern on energy conversion Methodology Block Diagram Block Diagram Test Procedure The researchers will use a shaker reproducing the vibration produced by the actual engine for testing purposes to avoid expenses of gasoline.

Testing the system under random vibration frequencies will be done and the performance of the system will be recorded. This random vibrations will be measured using an accelerometer.

Through these vibrations, the multiple piezoelectric materials will be able to harvest energy.

The harvested energy will be fed on the rectifier to convert the AC output of the transducer into DC voltage.

After this procedure the converted AC will be fed into the dc-dc converter to increase the low output voltage of the piezoelectric transducers and maintain the level within the input charging requirement of the battery. The use of the dc-dc converter also avoids unwanted pulsating input.

The researchers will be able to monitor the harvested energy and the vibrations produced by using DMM and accelerometer.

The researchers could then anticipate if the energy harvested would be sufficient for charging the automobile’s battery. Expected Result The expected result of the system would harvest sufficient energy coming from the vibration produced by the engine of an automobile for charging the automobile's battery using number of piezoelectric materials. end.
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