The particulate filter, commonly referred to as the DPF, is mounted separately from the engine block in the same area as the catalytic converter. The DPF is responsible for removing diesel particulate matter (or soot) from the exhaust gas of a diesel engine. In order to regenerate the filter, which is continuously accumulating soot, carbon deposits must be burned off by increasing the temperature of the exhaust gas at the inlet of the filter.
During regeneration, the temperature of the exhaust gas can be regulated precisely. The transmitter informs the engine control unit (ECU) of the exhaust gas temperature. It is thus possible to calculate precisely the amount of post-injection fuel required to increase the temperature of exhaust gas during the regeneration phase.