Método para detecção de adulteração do etanol na gasolina automotiva do tipo "C" em tempo real através da análise de vibração por sensores piezoelétricos

Abstract

It is known that automotive vehicles do not have a safety device capable of informing about fuel adulteration, in this work it is addressed the development of a means for the consumer to be aware of fraud in real time, which implies positive impacts, such as: reduction of maintenance costs with the car, by avoiding the deterioration of internal parts; in the reduction of environmental damage, for the non-alteration of the concentration of polluting gases produced in combustion; In addition to the possibility for the consumer himself to evaluate the quality of the fuel, allowing the selection of suitable filling stations, which by having the quality evaluated so easily, it is expected a reduction in the fraudulent practice, also enabling the fight against the crime of tax evasion so recurrent. The present study develops a method for real-time and non-invasive determination of ethanol adulteration in type "C" gasoline. The system is based on a piezoelectric sensor that acquires the vibration signal emitted by the engine of a running vehicle, and the signal is then processed using the Fast Fourier Transform (FFT) technique. The percentage of ethanol in type "C" gasoline varied from 29% to 45% in 10 samples to characterize the chaotic behavior. Thus, a polynomial trend was demonstrated between the frequency variable and the percentage of ethanol in type "C" gasoline, with a correlation coefficient of 0.93168.