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Two-Stage Electro Thermal Supported HC (Hydro Carbon) Conversion
Abstract:
Many diesel engines have to work at load profiles which, due to
the low exhaust gas temperatures, necessitate active regeneration
procedures to ensure continued engine operation and the reliability
of the particulate filter. An active regeneration may be initiated
via inner engine measures such as late injection. However, due to
high maintenance interval and run time requirements for non-road
applications the combustion of soot accumulated in the diesel
particulate filter (DPF) often is realized via downstream
processes. Known methods for this purpose are burner systems,
systems based on downstream hydrocarbon injection (HCI) and
subsequent hydrocarbon (HC)-conversion due to a catalyst or a
combination of both.
This paper describes an autarkic system using two-stage
electro-thermal-supported hydrocarbon conversion. This system is
capable to regenerate a DPF within the entire engine operating
range and it is less complex than flame burner systems. Compared to
the systems that work only with HC-dosing, the described system has
the advantage that it is able to regenerate a DPF at low exhaust
gas temperatures. It has the additional benefit that it can be used
for thermal management of any exhaust aftertreatment system,
ensuring early light-off even under adverse engine operating
conditions such as cold start and prolonged idling. The system is
NO₂-neutral and does not need an additional operating fluid like a
fuel-borne catalyst.