GPF, Just a DPF for Gasoline Engines?

Authors

Emmanuel Jean,
Faurecia Clean Mobility, Bavans

Summary

Since January 2011 all new Diesel passenger cars sold in Europe are fitted with a DPF (Diesel Particulate Filter). This technology has drastically reduced the particulate emissions of the Diesel engines. The pressure is now on the Gasoline Direct Injection technology to reach similar particulate emissions level. Both technology need to fulfil the same PN (Particulate Number) standard under both WLTP and RDE testing conditions.

Technically it is possible to use the DPF technology to address the GDI particulates level requirements. The wall flow ceramics with high resistance to thermal shock (SiC, TiAl) are able to filter soot out of gasoline exhaust, but the different boundary conditions (especially on regeneration frequency and maximum temperatures) in a GDI exhaust gas (compared to diesel) enables the use of other technologies, esp. high porosity cordierite.

In this paper this differences in technology and constraints are explained in more details. The main technical hurdles are described (packaging, canning, backpressure, temperature) using simulation as well as measurement results on engine bench and vehicles. Differences to Diesel technology are highlighted. Integration
examples and combination with the TWC are shown associated with this result.

Finally perspectives are given about the broad deployment of the technology and the ongoing evolutions.

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