regeneration strategies for gasoline particulate filters 2019-01-0969
Gasoline particulate filters are extremely effective at reducing tailpipe emissions of particulate mass and
particulate number. Especially in the European and Chinese markets, where particulate numbers are legislated,
we see gasoline particulate filters being deployed in production on gasoline direct injected engines.
Due to the high temperature in gasoline exhaust, most applications are expected to be passively regenerating
without the help of an active regeneration strategy. However, for the few cases where a customer drive cycle
has consistently low speed over a long time frame, an active regeneration strategy is required.
This involves increasing the exhaust temperature at the GPF up to around 600 degC so that soot can be
combusted. We compare two different ways of doing this, namely spark retard and air fuel ratio modulation.
The former generates heat in the engine, the latter generates heat in one or more catalysts in the exhaust system.
We list some benefits and drawbacks of both methods, and validate our work with experimental data.
Michiel Van Nieuwstadt, Anil Shah, Emil Serban, Douglas Martin