P2.7 - Pulsed Polarization of Lambda Probes – Evaluation of the Polarization Current

S. Fischer, R. Moos, R. Pohle, E. Magori, M. Fleischer & B. Farber
Conventional thimble type lambda sensors show strong response on NOx by evaluation of the open circuit discharge characteristics after defined polarizations with alternating signs. The sensor signal is dependent on oxygen or water concentration but the influence on discharge characteristics is consistent with Nernstian behavior. This confirms the feasibility of a pulsed mode operated lambda probe as a NOx sensor for exhaust gas measurements. To find the underlying mechanism of this polarization technique, the current...