Abstract
Keywords:
catalytic converter, OBDII/EOBD, ionic condacter, NOx sensor.
Abstract
The aim of this dissertation is to determine the basis for the monitoring of catalytic converters in compression ignition engines by the emission level of a selected exhaust gas component as a diagnostic signal. The emission of NOx has been taken as the basis. This required the development of a specialized system allowing the reduction of NOx and obtaining of a diagnostic signal reflecting the level of the said reduction. The dissertation comprises the introduction in the investigated field. The analysis of European directives regulating the emission limits has been performed. Furthermore, some directives for EOBD emission levels have been analyzed. The objectives, purposes and requirements of the OBD II/EOBD standard and system have been presented. Basic assumptions regarding the catalytic converters have been determined and the monitoring systems, currently applied in spark ignition engines, have been presented. The development of a catalytic converter required an analysis of selected physical parameters of the supports. This resulted from the necessity to assume given parameters of the supports applied in the tests in exhaust gas environment in the CI engines. An analysis of ionic conductors which constitute the basic solution in voltage sensors providing signals through NOx electrocatalysis.