Function principle in an overview
Design of a filter
A HUSS, LLC filter is modular designed and consists basically of three parts: Module “A” has the function of the exhaust inlet and provides the regeneration device (MK-system, ME-system). The other systems (MA-system, MD-system) do not need a regeneration device. In these cases module A is the exhaust inlet only. Module “B” contains the filter medium itself. The SiC ceramic is shock proof supported. Module “C” has the function of the exhaust outlet and contains, under the customer’s request, an additional integrated muffler. All modules are connected with fast release clamps and gas proof tightened with special gaskets.
Integration on the vehicle
The filter is mounted in place of the original muffler. HUSS Filters can be equipped with an additional muffler in module “C” of the filter, so that the engine is according to the noise regulations after the filter installation. The particulate filter is integrated in the exhaust piping of the vehicle. HUSS provides various exhaust inlets and outlets. Apart from that, modular design of the filter offers the possibility of twisting the modules. This opens up individual adoptions on the vehicle – especially in the retro-fit situation.
Filtration and Regeneration of the filter
While driving, the exhaust gases are lead through the particulate filter, which is integrated in the ex-haust piping. The exhaust is cleaned and the particles remain in the filter. In doing so, the filter is loaded with soot and the backpressure in the exhaust is increased. When the maximum allowed backpressure is reached (mostly 150 mbar) the electronic control warns that the filter has to be regenerated.
The active MK-system system does the regeneration while the engine is shut down. The regeneration is activated by the electronic control. The necessary heat energy is provided by burning diesel or transforming electrical energy. Finally the filter medium is heated up. When the soot igniting temperature of 1022°F is reached, the soot is oxidised with additional oxygen, coming from a blower unit, into CO2. After the regeneration, the vehicle is able to drive for another 8-10 working hours without regenerating again. The filter is designed for loading soot in this period of time.
The active W-system works with exchangeable and reusable filter cartridges. The soot loaded cartridge is demounted from the vehicle and replaced by a fresh one. The loaded cartridge is regenerated on an external oven. After the regeneration, this cartridge can be used again. The mounting and demounting is very easy due to the fact that the cartridge is connected to the vehicle with a fast release clamp.
The active MD-system works during driving mode. When the filter needs to be regenerated the clever electronic control starts the regeneration process automatically. Diesel from the vehicle’s tank is injected into the exhaust gases. A special coated catalyst increases the temperature above 1022°F. The filter is heated up and the particles are burned.
The passive system (MA-system) regenerates during driving mode. An additive that acts like a catalyst is dosed to the fuel of the engine. The additive is added to the diesel particles right from their existence. Whenever the exhaust gas temperature is enough and the soot load of the filter is above a decent level, the regeneration takes place.
