Pulsed discharge regeneration of diesel particulate filters

K. Graupner*, Jonathan Binner, N. Fox, C. P. Garner, J. E. Harry, D. Hoare, K. S. Ladha, A. Mason, A. M. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
238 Downloads (Pure)


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

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Surfaces, Coatings and Films


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