Automatically regenerating DPF system ensures that your emergency genset is always ready to generate clean power

Johnson Matthey’s ActivDPFTM system integrates the patented CRT® system with a load bank for reliable filter regeneration, even when there is insufficient load for passive regeneration. The ActivDPF delivers the same benefits as the CRT system, plus:

  • Exercising of the engine at loads recommended by engine manufacturer, prevents wet stacking
  • SootAlert® integrated with load bank controller monitors backpressure to automatically adjust engine load for filter regeneration
  • Low capital cost compared to other active systems - multiple engines can share one load bank
  • Low operating cost - fuel is only consumed during infrequent filter regeneration

ActiveDPF vs other actively regenerating DPF technologies


ActivDPF system

Other systems

System description

DOC, filter, and load bank

Filter only

Product technology

Integrated load bank increases engine load

Filter heated by electrical resistance

Regeneration mechanism

Soot reacts with NO2 that is formed over the DOC

Combustion of soot with O2 at higher temperature

Energy consumption

Regeneration requires less energy

Regeneration requires more energy

Regeneration frequency

Only when needed


Conversion of CO, HC

DOC converts CO, HC

Catalyst must be added to convert CO, HC

Exercises engine per OEM recommendations

Prevents wet stacking to ensure reliable power generation

Operation can result in wet stacking, more maintenance

Value engineering

Single load bank shared between multiple gensets

Regeneration technology required on every single genset

Cost of ownership

(capital and operating)



SootAlert Monitor is standard on all ActivDPF and SCRT systems:

  • Remote monitoring of single or multiple gensets
  • Easy access to historical data
  • Remote data retrieval through internet/network connection