Light-Off Temperature Shift for Catalyzed Diesel Particulate Filter On-Board Diagnostics

Paper #:
  • 2012-01-1248

Published:
  • 2012-04-16
Citation:
Schultz, R. and Meckl, P., "Light-Off Temperature Shift for Catalyzed Diesel Particulate Filter On-Board Diagnostics," SAE Technical Paper 2012-01-1248, 2012, https://doi.org/10.4271/2012-01-1248.
Pages:
7
Abstract:
Upcoming California on-board diagnostics (OBD) regulations require lighting the malfunction indicator lamp (MIL) when a catalyzed diesel particulate filter (CDPF) is inert with respect to nonmethane hydrocarbon (NMHC). Light-off temperature shift detection uses a correlation between CDPF age and the gradual increase in catalyst light-off temperature to determine the age of a CDPF. The proposed OBD strategy necessitates slipping HC past the upstream diesel oxidation catalyst (DOC) to ignite on the CDPF. The best-case OBD solution space requires engine net power levels less than 43 hp on a Cummins ISB. Radial temperature measurements downstream of the DOC revealed regional DOC light-off which would not be able to be detected by a single temperature sensor. CDPF light-off independent of DOC light-off was never observed under any testing, eliminating the possibility of using light-off temperature shift as a detection strategy.
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