Physitec SiC-U Diesel Particle Filter with Electronic Regeneration.

You can turn the particle filter with your mouse.


Operating Principle and Technology

Image 1: „Wall flow“ Principle

The structure of the filter core is based on a silicon carbide honeycomb and operates according to the so-called „Wall flow Principle“ (Image1). The exhausts flow through the inlet ducts which are closed on the outlet parts. The deposition of the soot particles takes part on the thus forced flow on behalf of the porous channel walls.


Image 2: SiC-Filter Structure

As far as the silicon carbide filter (SiC) is concerned, the indivisual honeycombs are being connected by joints of special cement (Image 2). Thus the inherent stresses due to combustion of the soot and the thermal expansion of the filter module can be fully compensated.

As far as the Physitec SiC-U Diesel Particle filter (without catalytic coating) the combustion of the soot is being guaranteed by beans of mere active combustion chamber supported regeneration (Image 3). The engine can be operated by standard diesel fuel without any restrictions with respect to its sulfur content.  

Regeneration of the accumulated particles takes place by means of combustion on behalf of an electronic heating. Regeneration takes place after approximately 8-10 operating hours (depending on the engine-out emissions) upon stand-still of the engine. The regeneration duration depends on the heating performance and takes approximately between 45 minutes and 8 hours (over-night regeneration).

The heating performance of the heating spirals depends on the size of the soot filter device and ranges between 1.5 to 2.2 kW / 230V AC (8 hours regeneration duration) respectively 3.3 kW/400V AC (45 minutes regeneration duration).

Image 3: Schematic display – Diesel Particle Filter SiC-U with electronic regeneration



  • Fully independent from the exhaust temperature
  • Inexpensive diesel particle filter system



  • With respect to mobile machines and devices which neither have to pay attention to exhaust temperatures nor conditions of usage such as e.g.: fork-lifts, wheel bearings, telescopic handlers, rollers, generators, auto cranes, municipal vehicles.
  • Offline-regeneration when off-road vehicles are concerned
  • Online-regeneration when generators are concerned (while the engine is running the exhaust will be heated up to the ignition temperature of the root by means of the heating element)



  • VERT certified and accredited
  • Verified and examined by the Swiss Bundesamt für Umwelt (Federal Department for Environment) BAFU as well as by the Suva as far as retrofitting of diesel engines are recommended
  • Requirements according to TRGS554 fulfilled for Germany
  • No NO2-increase
  • Decrease of particle emissions ≥ 99%
  • Reduction of puffs of smoke ≥ 98%