P2.2.6 In-Operation Monitoring of the Soot Load of Diesel Particulate Filters with a Microwave Method

Event

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany

Chapter

P2.2 Resonant Sensors

Author(s)

M. Feulner, G. Hagen, A. Müller, D. Brüggemann, R. Moos - Bayreuth Engine Research Center (BERC) (Germany)

Pages

1422 - 1425

DOI

10.5162/IMCS2012/P2.2.6

ISBN

978-3-9813484-2-2

Price

free

Abstract

A contactless sensing technology for determining the soot load of a diesel particulate filter (DPF) is introduced. This method uses microwaves that are impressed into the housed DPF. Resonance modes form and the input reflection coefficient, S11, is a function of the frequency of the impressed microwaves. Around the resonance frequency, S11 depends strongly on the soot load of the DPF. In-operation experiments were conducted at a dynamometer test bench using a 3.0 l TDI-engine. S11 was compared with the differential pressure signal, which is serial standard for estimating the soot load of DPFs. Additionally, the soot mass of the DPF was gravimetrically determined. It was found out that the resonance frequency shows a good and reproducible correlation with both the actual differential pressure and the gravimetrically determined soot mass. Soot loading and DPF regeneration could be observed clearly with the microwave method. It can be concluded that this technique is suitable for in-operation soot mass detection.