Abstract
We investigated the harvesting performance of a double piezoelectric generator, which was embedded into the engine block of a small passenger car. The resonance frequency is approximately between 37 and 52 Hz, where the cantilever showed maximum displacement. In reality, the cantilever has a vibrating characteristic, which dramatically reduces displacement, even when the operating frequency deviates slightly from the resonance frequency. To acquire a large mechanical energy-to-electrical energy conversion, a multiple-piezoelectric generator was employed to absorb the energy even when the vibration switched from a resonance to a non-resonance frequency. In this study, a variable mass box was designed and installed in the engine block of a car. The variable mass box consisted of the serial connection of two masses with different weights. The operating frequency deviated from a resonance to a non-resonance frequency within a few hertz (3~4 Hz); the reduction in vibration was lower, leading to a significant acquisition of the resulting power. This is due to the variable matching of the generator, realized by the action of dual mass. This type of generator was installed in the engine block and produced up to 0.038 and 0.357 mW when the engine was operating at 2200 and 3200 rpm, respectively.
Highlights
In recent years, automobiles have used multiple-sensor systems to monitor service conditions and optimize their operation [1,2]
Piezoelectric energy harvesting is a typical method of converting external mechanical vibration into electrical energy
In mechanical impedance matching between an external mechanical vibration signal and the mechanical characteristics of a piezoelectric device, the usable approach is to match the resonant frequency of the piezoelectric generator with the ambient frequency of environmental vibration [16,17]
Summary
Automobiles have used multiple-sensor systems to monitor service conditions and optimize their operation [1,2]. Matching the resonance frequency of a piezoelectric generator with that of an external vibration source is the most realistic scavenging system method based on piezoelectricity [18,19,20]. The resonance mode covers a frequency range that matches the variable vibration frequency source Another method is to make sure that the frequency of the modulated generator is considered in response to the variations in the external vibration source. It is important to find the places where large vibrations in the car can be observed: the car engine and nearby With these two considerations, in this study, two piezoelectric generators were connected to the engine block of a small passenger car, and their effectiveness and the factors needed to control the harvesting system were evaluated. The performance of the piezo-generator was measured in the range of resonance frequency and evaluated at ambient vibrations
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