The paper presents main method of monitoring catalytically comerter in CI engines. In this paper presents modified test bedwitch used to testes of exhaust pipe in light of determination possibility of application measurement probę to determine of NOx concentration. Those investigation could help to evaluate of possibility catalytically converter monitoring within the framework on board diagnostic systems The OBD system is an integral part of the vehicle connected with the engine control system, Nowadays the investigation on the on board diagnostic systems in their different applications are one of the basic problems that the OBD method is concerned with. The implementation of the investigation method for the OBD system efficiency is one of the main questions of the matter in hand. Diagram of modification exhaust pipe with installed catalytically converter in test bed and present of measurement points, distribution of temperature in measurement point TO-T8 exhaust pipe of testing engine without catalytically converter during realization ESC test, distribution of temperature in measurement point TO-T8 exhaust pipe of testing engine with 200 cpsi catalytically converter during realization ESC test, distribution of pressure in measurement point pO-p8 exhaust pipe oftesting engine without catalytically converter during realization ESC test, distribution of temperature in measurement point pO-p8 exhaust pipe of testing engine with 200 cpsi catalytically converter during realization ESC test are presented in the paper.
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