Wyniki wyszukiwania - BazTech

1

Contour of vibroacoustic map in diagnoses of engine's failure

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

Journal of KONES

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2009

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Vol. 16, No. 2

217-224

EN

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.

2

Vibroacoustic diagnosis of EGR system

Kazmierczak A., Wróbel R.

Silniki Spalinowe

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2008

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R. 47, nr 3

40-51

EN

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. The polluted flowing valve of circuit has an influence on stability of engine's work. The authors presents a new way of diagnosis in automotive vehicle which depend on detection and measure of vibroacustic vibrations that were subjected to digital signal processing. It seems that EGR circuit that does not work properly shouldn't have an influence on vibrations generated by an engine. However, authors indicate that this statement is wrong.

PL

System recyrkulacji spalin gazów wylotowych jest popularnym systemem wykorzystywanym do ograniczania emisyjności pojazdów samochodowych. Zasada działania systemu jest oparta na wtłoczeniu do komory spalania części gazów wylotowych. Zanieczyszczony zawór dolotowy systemu ma wpływ na stabilną pracę silnika. W niniejszym artykule autorzy prezentują nową metodykę diagnostyczną opartą na pomiarze drgań, poddanych operacjom cyfrowego przetwarzania sygnału. Wydaje się, że nieprawidłowo działający układ EGR nie powinien mieć wpływu na drgania generowane przez silnik. Autorzy wykazują, że takie stwierdzenie jest błędne.

3

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

Kaźmierczak A., Wróbel R.

Journal of KONES

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2008

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Vol. 15, No. 4

217-225

EN

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.

4

Systemy oparte na DSP w diagnostyce samochodowej

Wróbel R.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2006

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nr 7

217-220

PL

Przetwarzanie cyfrowe {Digital Signal Processing) jest bardzo dynamiczną dziedziną telekomunikacji. Możliwe stało się jego wprowadzenie do innych dziedzin. W diagnostyce samochodowej szczególnie ważna wydaje się możliwość filtracji dźwięków oraz rozpoznawanie obrazów. Szczegółowo omawia się wtasną koncepcję wykorzystania DSP w bieżącej diagnostyce pracy silnika samochodowego. Koncepcja opiera się na komparacji charakterystycznych części widma sygnatów, doprowadzonych do procesora z czujników, umieszczonych na obudowie cylindra z zapisem wzorcowym. Analiza umożliwia określenie stanu pracy silnika oraz występowanie, rodzaj i lokalizację ewentualnych usterek.

EN

Digital signal processing has been rapidly growing area of telecommunication. An implementation ofthistype signal processing in other areas became real. In the car diagnostic it seems to be of primary importance a possibility of the sound filtration and the image recognition. In details the authors concept of the DSP application in the current diagnosis of a cafs engine work is discussed. The concept is based upon a comparison signals, lead to the processor from sensors placed at cylinder's cover and a standard record. The analysis makes it possible an evaluation of the engine state and presence, kind and place of possible.