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Contour of vibroacoustic map in diagnoses of engine's failure

Kaźmierczak A., Janicka A., Tkaczyk M., Wróbel R.

Journal of KONES

2009

Vol. 16, No. 2

217-224

Almost all engine failures have an influence on engine's vibration, which is described in the article .Of course not every time diagnostic system can report of that. This is a reason why detection of vibrations must be accomplished with high quality diagnostic systems. Therefore, Doppler laser Vibrometry based on scanner Polytec had been used. To achieve full diagnostic results multidimensional vibration's function has been invented, where the torque moment is used as an extra parameter. Measured vibrations were subjected to digital signal processing like windowing, fast Fourier transform, filtration byfinite impulse response windowed filters. The results of measure and processing per-form inform of contour 3 D plots, which indulge in speed estimate of the usefulness of presented method. Tested engine performance, vibration measurement parameters, adopted diagnostic circuit, Digital processing of vibration signal, Vibration versus torque and magnitude spectrum (contour vibroacoustic map) of engine in good working order; co = 2000 rpm, contour vibroacoustic map of engine in good working order; co = 4000 rpm, contour vibroacoustic map of engine with fail of injection system; co = 2000 rpm, contour vibroacoustic map of engine with fail of injection system; co = 4000 rpm, contour vibroacoustic map of engine withfail of turbo charger; co = 2000 rpm are presented in the paper.

The possibility of diagnosis EGR system's defects by vibration analysis

Kaźmierczak A., Wróbel R.

Journal of KONES

2008

Vol. 15, No. 4

217-225

The Exhaust Gas Recirculation is a popular system of recirculation of the automotive vehicle emission. The principle of working depends on the forcing in the part of outlet gas to the combustion chamber. Majority of the users of automotive vehicles with EGR systems claim that system has negative effect on the performance of the car. Nonetheless, that opinion is subjective, because the generally available research on the subject does not exist. However, EGR system, as the most of automotive vehicle is being subjected to physic's rules - it uses up. The polluted flowing valve of circuit has an influence on stability of engine's work, and what follows on a performance of a car. The authors present a new in - vitro way of diagnosis in automotive vehicle, which depend on detection and measure of vibroacustic vibrations of the diesel engine. It seems that EGR circuit that does not work properly should not have an influence on vibrations generated by an engine. However, authors indicate that this statement is wrong. EGR system has an influence on engine's vibration, what was described in the article. On that way, detection of vibrations must be accomplished with high quality diagnostic systems. Therefore, vibrometric laser scanner Polytec had been used. To achieve full diagnostic results multidimensional vibration's function has been researched, where the torque moment has been used as an extra parameter. Measured vibrations were subjected to digital signal processing like windowing, fast Fourier transform, filtration by finite impulse response. The results of measure and processing perform in form of 3D plots, which indulge in speed estimate of the usefulness of presented method. Moreover authors presents principle of working EGRs' systems of different generations and its evolution.