Sintered metal filter actively regenerated

Active systems such as the SMF ® -AR (sintered metal filter with self-sufficient thermoelectric regeneration) are often used in mobile machines and stationary applications in the case of widely differing application profiles with exhaust gas temperatures that are often too low .

Actively regenerated particle filter for individual requirements

This means that the particle filter can be regenerated at almost any engine operating point, regardless of the temperature. The temperature required for burning off the soot is generated by the SMF ® -AR system itself. Flexible use is possible thanks to the compact design and the modular structure of the SMF ® -AR system. Piping and brackets can also be individually adapted to different machines and vehicles.

Benefits

  • Reduction of soot and fine particles by more than 99%
  • Reliable filter regeneration even at low exhaust gas temperatures
  • Regeneration without DOC enables operation even with high sulfur content of the fuel
  • Flexible adaptation to different machines and engine outputs
  • The high ash compatibility ensures long mileage.
  • The modular design makes it easier to dismantle the system during service.

Modularity

The system has a modular structure so that it can be integrated into a wide variety of applications with little effort. Depending on the installation situation and performance range, you can choose from different system sizes and housing shapes as part of the extensive HJS delivery program.

Technology and functionality

With the SMF ® -AR system, the exhaust gas is filtered until an optimal amount of soot for regeneration has accumulated on the filter. The system uses the positive properties of a fuel additive, which on the one hand lowers the soot ignition temperature and on the other hand increases the soot burn-off speed. The stored soot can therefore be burned off automatically in a regeneration process at an exhaust gas temperature of around 400 °C. If the required temperature is not reached, as is often the case in the low-load range, the system’s active regeneration support comes into play in the form of a thermoelectric heater.

Active regeneration with additive

The control unit initiates (active) regeneration via heating elements arranged in a circle. The accumulated soot is ignited by the radiant energy of the heating elements and the regeneration process ends automatically after the initial ignition of the soot layer. The soot burns off at regular intervals. With the help of the control unit, not only the ignition of the soot is initiated, but also the optimal amount of additive is dosed, the necessary filter load is determined and the most favorable time for regeneration is determined with the help of a corresponding sensor system.

A self-learning driving cycle recognition also largely ensures that regeneration is not interrupted when the engine is switched off. Due to the high soot storage capacity of the SMF ® -AR system, regeneration does not take place at a single, ideal point in time, but within a generous time window. Aborting the regeneration by switching off the engine is therefore absolutely unproblematic for the safe functioning of the SMF ® -AR system. Another advantage of the SMF ® is its high ash storage capacity, which enables long maintenance and cleaning intervals.

Scope of application

The SMF ® -AR system is mainly suitable for off-highway applications, but also for commercial vehicles and buses, and in combination with an SCR system for nitrogen oxide reduction. This technology is also used for stationary engines, rail and marine applications. HJS-SMF ® -AR systems are available for both original equipment and retrofit applications.