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Photogallery

The easiest way to have a good impression about our activities and how a particulate filter is integrated on certain vehicle types.

FAQs

Here we explain all obscurities concerning particulate filters, emissions, legal regulations, the filter material and the different HUSS, LLC filter systems.

HUSS on CONEXPO in Las Vegas/ Nevada: Booth S 12500

Visit us at HUSS on CONEXPO in Las Vegas/ Nevada: Booth S 12500 from 11.3.08 to 15.3.08

Filtration Procedure

wall-flow-filtering

Besides the right choice of the filter medium, the decision for the right filtration technique is very important, too. The highest soot collection rates, in the range of all particle sizes, are achieved by the so called "wall-flow filtering" principle. The exhaust gases are lead through the tiny channels of the filter medium. The channels are closed alternatedly. That means that the exhaust is not able to take one channel for entering and leaving the filter. Therefore, the exhaust gases are forced to stream through the channel walls into the neighbour channel. Due to the alternated sealing, the exhaust gases are allowed to escape through this channel. The name of this principle is due to the fact that the walls of the filter channels are used for filtration. While streaming through the walls of the channel the exhaust gases are slowed down. The particles are slowed down too and get caught in the porouseous structure of the channel. Above this, the soot particles are too big for streaming into the neighbour channel. The result of both effects is a marvellous soot collection rate. HUSS’ filters are made without any exception of Silicon Carbide. The soot collection rate is above 99%.

non wall-flow-filtering

In contradiction to this, there is the function principle of the "non wall-flow" filtering methods. The channels of the filters are not closed alternatedly. The exhaust gases are taking the same channel for entering and leaving the channel. The effect is that the exhaust gases are just passing through the filter. Correspondingly poor is the filtration effect. In dependence on the speed of the exhaust gases the soot collection rate is in the range between 40% and 60%. Emission reduction regulations are very often demanding a higher collection rate or lean against VERT. The California Air Resource Board (CARB), for example, demand a collection rate of at least 85%. Hence, non wall-flow filtering methods are not efficient enough to meet this standards.

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