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

M. Feulner, G. Hagen, A. Müller, D. Brüggemann & R. Moos
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....