Wyniki wyszukiwania - BazTech

1

Analysis of automotive ignition systems in laboratory conditions

Korenciak Daniel, Kubis Matej, Sebok Milan, Gutten Miroslav, Kucera Matej

Przegląd Elektrotechniczny

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2020

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R. 96, nr 9

48--51

EN

Paper presents basic principles and diagnostic analysis of automotive ignition system for various working and adverse states in laboratory conditions. In the first part of the paper it is examined description and importance of basic diagnostics of automotive ignition system. In the second part of paper they are described on basic principles and solution of spark plug model. In the next part of paper it is focused on proposed test laboratory device for fault simulation. In the finally, specialized measurements were made on the proposed measurement system by simulating faults by applying oil and gasoline between the electrodes and failing to make the ignition contact of the driver on the spark plug.

PL

Artykuł prezentuje laboratoryjną analizę diagnostyczną samochodowego systemu zapłonowego w różnych warunkach pracy. Dokonano przeglądu metod testowania i zaproponowano nowy system diagnostyczny. Przeprowadzono też symulację defektów.

2

Attempt of injectors failure detection based on measurement of the angular speed discrete value

Dereszewski M., Charchalis A.

Journal of KONES

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2013

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Vol. 20, No. 3

131--137

EN

The paper presents results of the experiment focused on detection of faulty injector of medium speed diesel engine, in way of analysis of IAS (Instantaneous Angular Speed) of the crankshaft. The experiment was carried out at laboratory stand in Gdynia Maritime University, equipped with diesel engine Sulzer 3AL 25/30 driving electrogenerator. Sulzer 3AL 25/30 is three cylinder, medium speed, four stroke marine diesel engine, with maximum output 400 kW at 750 rpm. In order to evaluate of IAS utility for diagnosis of the engine, two kinds of wrong adjustment of fuel injection valve’s spring were simulated. First malfunction was too weak spring (initial tension of 15.0 MPa against 25.0 MPa in normal condition), the second was too strong tension of the spring (35.0 MPa). The base of experiment was to angular speed recording, in three different conditions of the engine: healthy one and with two simulated malfunctions. Measurements were carried out at two different loads, respectively 150 kW and 250 kW. The IAS was measured and recorded by the measurement system ETNP-10, which mode of operation was based on perforated disc mounted at the shaft and photo-optic sensor counting laser impulses. Noise decomposition of measurement results was based on triple smoothing using Savitzky-Golay filter. IAS runs of faulty engine were compared with healthy engine measurement, in order to detect all deviation from normal condition.

3

Evaluation of diagnostic information about marine engine work based on mesurement of the angular speed discrete value

Dereszewski M., Charchalis A., Polanowski S.

Journal of KONES

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2012

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Vol. 19, No. 2

121-128

EN

The paper presents results of the experiment, aimed on finding the answer whether IAS (Instantaneous Angular Speed) and angular acceleration of the crankshaft is carrying information about quality of combustion in cylinder of the diesel engine. The experiment was carried out at laboratory stand in Gdynia Maritime University, equipped with diesel engine Sulzer 3AL 25/30 driving electro-generator. Sulzer 3AL 25/30 is three cylinder, medium speed, four stroke marine diesel engine, with maximum output 408 kW at 750 rpm. In order to evaluate of IAS utility for diagnosis of the engine, two kinds of malfunctions of engine's fuel system were simulated. First malfunction was fuel leakage from high-pressure line; the second was partly plugged injector's nozzle. Construction of high-pressure fuel pump enables to simulate fuel leakage. The level of leakage was controlled by simultaneous measurement of pressure in the high-pressure tube. For simulation of injector malfunction, the chocked one was installed in second cylinder. The engine was running at different loads, starting from around 25% up to 70% of nominal. The IAS was measured and recorded by the measurement system ETNP-10, which mode of operation was based on perforated disc mounted at the shaft and photo-optic sensor counting laser impulses. Results of all measurement were smoothed in order to eliminate a noise. Measurement results of fault condition were compared with healthy engine measurements and with results of in-cylinder pressure diagrams, in order to detect all deviation from normal condition.

4

Analysis of diagnostic utility of torque and rotational speed fluctuation of propulsion shaft

Dereszewski M., Polanowski S., Charchalis A.

Journal of KONES

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2011

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Vol. 18, No. 4

77-83

EN

In the paper has been presented the analysis of diagnostic utility of signals, deriving from torque (measured value is an instantaneous shaft's torsion angle, torque value is subsequently calculated basing on shaft's steel Kirhoff's modulus or Young's modulus values) and angular acceleration of the propulsion shaft. All measurements has been carried out using photo optic torque meter ETNP-10, which was installed at the propulsion shaft run by two-stroke low speed marine diesel engine. In order to distinguish diagnostic signals, measurements of healthy engine run and subsequently simulations of a failure by one cylinder cut-off (suspending of a fuel pump) were done. Analysis of torque, revolutionary speed, angular acceleration were and subsequently, in order to distinguish spectral attributes of above functions, fast Fourier transform of speed waveforms were carried out. Diagrams presented in the paper shows comparison of mentioned above signals' waveforms. The most significant influence of simulated combustion process deviation at a signal's variation was noticed when rotational speed and angular acceleration of the shaft were considered. Acquired results of research and measurements are to be a subject of further analysis in order to define representative symptoms and diagnostic values corresponding to propulsion system and engine failures.