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Particulate Matter Sensor for On Board Diagnostics (OBD) of Diesel Particulate Filters (DPF)
Abstract:
The emissions legislation in the US and Europe introduces the
need for the application of diesel particulate filters (DPF) in
most diesel vehicles. In order to fulfill future OBD legislations,
which include more stringent requirements on monitoring the
functionality of those particulate filters, new sensors besides the
differential pressure sensor are necessary. The new sensors need to
directly detect the soot emission after DPF and withstand the harsh
exhaust gas environment. Based on multi layer ceramic sensor
technology, an exhaust gas sensor for particulate matter (EGS-PM)
has been developed. The soot-particle-sensing element consists of
two inter-digitated comb-like electrodes with an initially infinite
electrical resistance. During the sensor operation, soot particles
from the exhaust gas are collected onto the inter-digital
electrodes and form conductive paths between the two electrode
fingers leading to a drop of the electrical resistance. A
controlled regeneration of the soot-detecting electrodes is
conducted by heating the sensing element and burning off the
deposited soot at temperatures above 600°C.
The concept and the performance of the EGS-PM as well as a new
concept for the OBD of diesel particulate filters using the EGS-PM
are presented.
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