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Detection of water droplets on exhaust gas sensors

Title data

Schönauer-Kamin, Daniela ; Moos, Ralf:
Detection of water droplets on exhaust gas sensors.
In: Sensors and Actuators B: Chemical. Vol. 148 (2010) Issue 2 . - pp. 624-629.
ISSN 0925-4005

Official URL: Volltext

Abstract in another language

In order to avoid water droplet-borne stress on planar ceramic exhaust gas sensor elements, it is suggested to apply interdigital electrodes (IDE) on the sensor elements. As soon as water droplets impinge the sensor element, the capacitance of the IDE increases. Not before the water is evaporated, the capacitance reaches its initial value, indicating that the danger of droplet-borne stress is over. During engine cold start, this signal can be used to initiate sensor heating period. Initial experiments that demonstrate the feasibility of this concept are described in this study. The influence of droplet sizes on the capacitance of interdigital electrodes is investigated and a quadratic correlation between water droplet diameter and capacitance is found out and is explained qualitatively by a physics-based model. Transient experiments investigating the behavior during droplet evaporation as well as real engine cold start experiments conclude the paper. The engine cold start tests prove that the start point and the end point of water condensation on a ceramic exhaust gas sensor element can be detected.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Research Institutions
Research Institutions > Research Units
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 08:13
Last Modified: 12 Apr 2016 07:01