Pulsed discharge regeneration of diesel particulate filters

Research output: Contribution to journalArticlepeer-review


  • K. Graupner
  • N. Fox
  • C. P. Garner
  • J. E. Harry
  • D. Hoare
  • K. S. Ladha
  • A. Mason
  • A. M. Williams

External organisations

  • Loughborough University
  • 3DX-RAY Limited 16 and 18 Hayhill Industrial Estate


A novel method for the removal of soot from a diesel particulate filter using pulsed electric discharges is presented. High voltage pulses of between 18 and 25 kV of nano to microsecond duration and with pulse energies of typically 100-200 mJ were applied to the filter via a series spark gap. Initial slow erosion of the soot layer proceeds via the formation of microdischarges. Subsequent spark discharges removed the accumulated soot more effectively from a larger filter volume. Average soot removal rates of ∼0.1-0.2 g/min were achieved at 50 Hz breakdown frequency by optimizing both electrode geometry and breakdown voltage. On-engine long term testing of the technology showed soot removal by pulsed discharge to be reliable, efficient and uniform; a total of 100 g of soot was deposited and removed over 18 filter regeneration cycles.


Original languageEnglish
Pages (from-to)467-477
Number of pages11
JournalPlasma Chemistry and Plasma Processing
Issue number2
Publication statusE-pub ahead of print - 20 Jan 2013


  • Environmental applications, Microdischarge, Plasma surface modification, Spark