Are diesel emissions clean enough? Photo: Empa
It is exactly 20 years since experts from Empa and VERT published the first test results on diesel particle filters. Today, more than 100 million vehicles worldwide are fitted with such filters. However, a VERT conference held at the Empa Academy revealed why the emission problem is by no means over. The saga of the diesel particle filter all began with a failure in California - and a success story in Switzerland. In the early 1980s, Daimler-Benz equipped a fleet of luxury limousines with particle filters for California. Built in a consortium involving the German company Degussa and the US ceramics manufacturer Corning, however, the filters crumbled on the underbody of the diesel cars. With 2,000 damaged engines and a recall campaign, this first attempt ended in disaster.
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