Conductometric Soot Sensor for Automotive Exhausts: Initial Studies

In order to reduce the tailpipe particulate matter emissions of Diesel engines, Diesel particulate filters (DPFs) are commonly used. Initial studies using a conductometric soot sensor to monitor their filtering efficiency, i.e., to detect a malfunction of the DPF, are presented. The sensors consist of a planar substrate equipped with electrodes on one side and with a heater on the other. It is shown that at constant speed-load points, the time until soot percolation occurs or the resistance itself are reproducible means that can be well correlated with the filtering efficiency of a DPF. It is suggested to use such a sensor setup for the detection of a DPF malfunction.

[1]  Ralf Moos,et al.  Direct Catalyst Monitoring by Electrical Means: An Overview on Promising Novel Principles , 2009 .

[2]  Johann Riegel,et al.  Exhaust gas sensors for automotive emission control , 2002 .

[3]  Joerg Adler,et al.  Ceramic Diesel Particulate Filters , 2005 .

[4]  Debora Fino,et al.  Open issues in oxidative catalysis for diesel particulate abatement , 2008 .

[5]  Ralf Moos,et al.  A Brief Overview on Automotive Exhaust Gas Sensors Based on Electroceramics , 2005 .

[6]  David G. Reid,et al.  ERRATUM: Electrical, magnetic and structural characterization of fullerene soots , 1996 .

[7]  T. Johnson.  Diesel Emission Control in Review , 2001 .

[8]  D. McLachlan,et al.  An equation for the conductivity of binary mixtures with anisotropic grain structures , 1987 .

[9]  Ralf Moos,et al.  Direct detection of coke deposits on fixed bed catalysts by electrical sensors , 2010 .

[10]  Norio Miura,et al.  Development of NOx sensing devices based on YSZ and oxide electrode aiming for monitoring car exhausts , 2004 .

[11]  D. Kubinski,et al.  Sensor and method for determining the ammonia loading of a zeolite SCR catalyst , 2008 .

[12]  Ralf Moos,et al.  In situ Monitoring of Coke Deposits during Coking and Regeneration of Solid Catalysts by Electrical Impedance‐based Sensors , 2010 .

[13]  R. Newnham,et al.  Electrical Resistivity of Composites , 1990 .

[14]  Ralf Moos,et al.  Sensing the soot load in automotive diesel particulate filters by microwave methods , 2010 .

[15]  Martyn V. Twigg,et al.  Cleaning the Air We Breathe - Controlling Diesel Particulate Emissions from Passenger Cars , 2009 .

[16]  U. Alkemade,et al.  Engines and exhaust after treatment systems for future automotive applications , 2006 .

[17]  M. Twigg.  Progress and future challenges in controlling automotive exhaust gas emissions , 2007 .

[18]  Ralf Moos,et al.  Recent Developments in the Field of Automotive Exhaust Gas Ammonia Sensing , 2008 .

[19]  Ralf Moos,et al.  Electrical In Situ Characterization of Three-Way Catalyst Coatings , 2009 .