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Volkswagen Group to begin equipping TSI and TFSI engines with gasoline particulate filters from June 2017

The Volkswagen Group will begin equipping the Group’s new TSI and TFSI gasoline direct injection engines with gasoline particulate filters (GPF). This initiative, announced by Group CEO Matthias Müller at the Group’s annual general meeting, will begin with the 1.4 liter TSI engine in the new VW Tiguan and the Audi A5 in June 2017.

This will reduce particulate emissions from the direct injection gasoline engines by up to 90%. Up to 7 million Volkswagen vehicles could be equipped with this technology each year by 2022.

Although gasoline direct injection (GDI) enables downsizing with its increased power and lower fuel consumption, it also results in higher particulate emissions. These are regulated by particle number (PN) in Europe; the limit value for GDI PN emissions will be the same as for light-duty diesel cars in 2017 under Euro 6c.

From the regulatory point of view, gasoline particulate limit compliance can be achieved either by the engine or with GPFs.

In his 2016 review of vehicular emissions, Dr. Tim Johnson of Corning noted that the choice of approach may largely depend on the PN conformity factors for RDE, which are yet to be determined. He noted that one estimate has GPFs costing €20 more than engine-based methods for PN reduction.

In May, Mercedes-Benz became the first manufacturer to announce large-scale use of GPFs. (Earlier post.) After more than two years of positive field tests with the Mercedes-Benz S 500, additional versions of the S-Class with gasoline engines will be equipped with this new technology with the next model upgrade.

That will be followed by gradual implementation in further new models, model upgrades and new engine generations. After that, particulate filters will also be applied in the current Mercedes-Benz model ranges.


  • Johnson, T., (2016) “Vehicular Emissions in Review,” SAE Int. J. Engines 9(2) doi: 10.4271/2016-01-0919


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