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Through this process the soot-loaded filter can be regenerated during any of the engine's operating states. This SMF® system with active regeneration consists of HJS's diesel particulate filter with sensor technology for function monitoring and for determining of the soot loading degree, of a fully automated additive dosing system, the heating elements for the filter regeneration and the control unit.
Since it can store 2.5 times more ash than honeycomb filters, increased ash formation resulting from additives is insignificant. When regenerating particulate filters, a distinction can be made between continuous CRT® systems and catalytic coated filters or discontinuously working systems (active regeneration). With the active regeneration process, soot is accumulated until an optimal amount for regeneration has been deposited on the filter material. It is only then that soot burning is actively triggered. With the HJS system, the ignition of the soot is achieved through radiant heat from heating elements. Three heating elements spaced at 10 mm encircle the entire filter and ensure the entire surface area of the filter material is evenly heated. Through the extremely low mass of the heating elements (diameter of only 2 mm) a very rapid temperature increase is achieved, which leads to an ignition of the soot layer even under extremely difficult conditions with just a 60 second heating period. Only around 10% of the sooty filter surface is heat radiated; this in turn triggers soot combustion over the entire filter surface.
Animation showing the active thermoelectric regeneration in a SMF®
