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Moos, Ralf:
Automotive exhaust gas sensors from an electroceramics point of view.
2016
Veranstaltung: 91. DKG Jahrestagung mit Symposium Hochleistungskeramik 2016
, 07.-09.03.2016
, Freiberg, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
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Vortrag
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Abstract
Nowadays, exhaust gas sensors are installed in quantities of millions in automotive exhaust gas aftertreatment systems. One of the few materials that is reliable enough to withstand the harsh exhaust conditions is stabilized zirconia. It combines oxygen ion conductivity, which is required for the sensors’ functionalities, with high strength. Originally produced in classical ceramics technology, most exhaust gas sensors are now produced in ceramic tape and thick-film technology. At first, this contribution outlines briefly the history of zirconia-based exhaust gas sensors, starting from the binary lambda-probe, the wideband lambda probe and the NOx sensor to the recently introduced ammonia sensor. It is also shown how the development of exhaust gas sensors has always to be considered in interaction with exhaust gas aftertreatment systems. This elucidates why novel kinds of sensors have gained in importance just recently when stricter emission regulations were announced, meaning that time was ripe for novel exhaust gas aftertreatment concepts. Another driver for the sensor development are the requirements to detect failures of exhaust gas aftertreatment components directly during car operation. The recently introduced ceramic soot sensor, which indicates already low amounts of soot in the exhaust, is an example for that. Its sole purpose is to diagnose the correct effectiveness of a diesel particulate filter.