A diesel particulate filter is a system for removing diesel particulates from diesel exhaust. Audi uses a system that exploits the most advanced state of the art: the "catalysed soot filter" (CSF for short) has a filter coating containing precious metals which acts in two ways. The passive regeneration process involves the slow, environment-protecting conversion of the particulates deposited in the catalytic converter into CO2. This process takes place within a temperature range of 350 - 500 degrees and occurs continuously without any special measures being required, predominantly when the car is being driven at motorway speeds.
Only if the car is used for any length of time at low loads, for instance in urban traffic, is the temperature of the exhaust gas actively raised to around 600 degrees every 1,000 to 1,200 kilometres, to prompt additional regeneration of the filter. The particulates captured in the filter burn off at this temperature.
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