PSA Peugeot Citroen has developed a new diesel particulate filter with a service life of over 150,000 miles, meaning it will effectively be maintenance-free. The breakthrough has come with the use of a new filter medium architecture, called Octosquare (referring to the shape of the filter's intake channels) and an improved fuel additive.
The first generation of particulate filters required servicing every 50,000 miles but in November last year PSA Peugeot Citroen introduced a new system that used a special fuel additive called Eolys, giving it the ability to go 75,000 miles without a service. A more efficient second generation Eolys additive, together with a filter with larger diameter and specially shaped intake channels, gives the latest system significantly increased capacity for storing particulate matter, which is then burnt off by a post injection combustion process during normal driving. The first Octosquare filters to appear on executive models from Peugeot and Citroen will be available in 2004.
The announcement came as PSA Peugeot Citroen passed a major milestone in this field, selling its 500,000th particulate filter since it first unveiled the technology in April 1999. The world's first diesel particulate filter appeared on the Peugeot 607 2.2 litre HDi in May 2000, followed by models within the Peugeot 406, 307 and 807 and the Citroen C5 and C8 ranges. Modern particulate filter-equipped diesels do not just offer lower fuel consumption and CO2 emissions, but their emissions of other contaminants are so low they far exceed the demands of current legislation.
Peugeot and Citroen currently offer six vehicle families with the particulate filter system: Peugeot 406, 406 Coupe, 607 and 807, and Citroen C5 and C8 but this will increase to 11 in the next two years, with a million particulate filter-equipped diesels rolling off production lines.
PSA Peugeot Citroen expects this increased availability of particulate filters to further accelerate the move to diesel, expanding its role in combating the greenhouse effect - an issue of key importance to the planet's sustainable development and central to PSA Peugeot Citroen's environmental policy.Published 30 June 2003