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Monitorowanie układu EGR silnika TDI

Cieślikowski B.

Autobusy : technika, eksploatacja, systemy transportowe

2012

R. 13, nr 10

38-42

W artykule omówiony został proces lokalizacji usterek w układzie EGR z wykorzystaniem listy kodów w systemie OBD II. Analizując procesy wymiany ciepła i masy na odcinku układu dolotowego silnika zwrócono uwagę na szereg uproszczeń w opisie formalnym, prowadzących do ustalenia przedziału tolerancji chwilowej wartości stopnia recyrkulacji. Posłużono się przykładem monitorowania układu EGR pojazdów grupy VW z silnikami 1,9TDI ASZ. Analiza funkcjonalna układu oraz znajomość procedur diagnostycznych pojazdu stanowi właściwe ukierunkowanie procesu lokalizacji uszkodzeń.

In the article was discussed the location faults in the agreement EGR using list of fault codes OBD II. Analyzing the processes of heat and mass transfer over a distance of the engine intake system, called attention to a number of simplifications in the description of formal, leading to establish a temporary tolerance range of recirculation. As an example was used the monitoring system EGR of vehicles with an engine 1,9TD.I Functional analysis system and knowledge diagnostic procedures, using selected recording car operating parameters, is the appropriate focus in the process location damage.

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.