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German aftertreatment specialist looks to expand in U.S. market.

Using a recent approval of its technology by the California Air Resources Board (CARB) as a springboard, a German exhaust aftertreatment specialist is looking to increase its presence in the U.S. markets. Huss Umwelttechnik, the evolution of a company that has been a supplier of exhaust emissions reduction systems since the 1980s, has received Best Available Technology (BAT) Level 3+ verification from CARB for its MK active regeneration system technology.

Level 3 verification requires a soot collection rate of at least 85% and Huss indicated the MK system is rated to remove 99% of particulates from the exhaust stream. In addition, the company said that the MK system also complies with new regulations for secondary emissions during regeneration. The CARB approval covers on-highway and off-road applications up to 670 hp.

MK system is a modular design that is designed to replace conventional mufflers. It incorporates a silicon carbide (SIC) ceramic substrate that is able to accommodate a loading time of between eight and 10 working hours, the company said. Once the filter is loaded, backpressure will increase and the filter will need to be regenerated.

For the regeneration process, a diesel burner is ignited while the engine is off. Depending on the filter size, the regeneration process takes five to 35 minutes to complete and typically about 3 to 10 oz. of diesel fuel are necessary for each regeneration.

The entire regeneration process and filter status is monitored and controlled by the HUSS Control Unit, which can be mounted anywhere in the cab or operator's compartment.

An additional advantage of the MK system, Huss said, is that it also controls secondary emissions through the use of an additional blower that is used to provide a sufficient supply of oxygen. In terms of installation flexibility, the filter can be integrated into the vehicle horizontally as well as vertically. Extremely compact filter sizes are available, as well as oval designs, to fit compact machines and narrow spaces.

The heritage of Huss in engine exhaust technology is a long one. It began in the 1920s as Huss Maschinenfabrik was founded in Bremen, Germany, with a focus on the manufacture of silencers, spark arrestors and exhaust washers for ships. In the 1980s, the company's experience from the ship-building sector was transferred to the forklift truck industry, and Huss began supplying diesel particulate filters with electrical regeneration systems for lift trucks.

In 2001, the exhaust aftertreatment segment was spun off as a separate operation, Huss Umwelttechnik, and moved to Nuremberg.

Huss explained that the CARB certification was a necessary step to market its products in the U.S. As a consequence, the company also founded Huss LLC in Palm Springs, Calif., in February of this year. An existing subsidiary in New York, headed by Peter Bruenke, will be responsible for business activities in the East Coast area.

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Publication:Diesel Progress North American Edition
Date:Aug 1, 2007
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