This content is not included in your SAE MOBILUS subscription, or you are not logged in.
An Investigative Study of Sudden Pressure Increase Phenomenon Across the DPF
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
Annotation ability available
Diesel particulate filter (DPF) is a widely used emission control device on diesel vehicles. The DPF captures the particulate matter coming from the engine exhaust and periodically burns the collected soot via the regeneration process. There are various trigger mechanisms for this regeneration, such as distance, time, fuel and simulation. Another method widely used in the industry is the pressure drop across the filter.
During calibration, relation between the pressure sensor reading and soot mass in the filter is established. This methodology is highly effective in successful DPF operation as pressure sensor is a live signal that can account for any changes in engine performance over time or any unforeseen hardware failures.
On the other hand, any erroneous feedback from the sensor can lead to inaccurate soot mass prediction causing unnecessary regenerations or even needless DPF plugging concerns. A similar phenomenon was observed on certain vehicles where the DPF pressure reading jumped inexplicably leading to DPF plugging concerns.
Extensive research and testing was carried out to understand this mysterious phenomenon starting with the usual hardware suspects such as pressure sensor, pressure lines, DPF substrate and washcoat etc. When none of these could be identified as the root cause, same drive cycles that caused this occurrence were tested on vehicles and dynamometer along with the environmental conditions and destructive testing was conducted on the filters.
Results indicated a remarkable phenomenon was occurring inside the DPF channels. Under certain driving conditions the soot inside the DPF channels collapsed causing sudden restriction and an abrupt increase in pressure across the DPF. This paper discusses the fascinating journey of how the conditions necessary for this pressure jump to occur were discovered and how some of the hardware design changes could mitigate the sudden pressure increase phenomenon, increasing the DPF robustness.
CitationKim, K., Mital, R., Higuchi, T., Chan, S. et al., "An Investigative Study of Sudden Pressure Increase Phenomenon Across the DPF," SAE Technical Paper 2014-01-1516, 2014, https://doi.org/10.4271/2014-01-1516.
- Li , J. and Mital , R. Effect of DPF Design Parameters on Fuel Economy and Thermal Durability SAE Technical Paper 2012-01-0847 2012 10.4271/2012-01-0847
- Edgar , B. , Balakrishnan , K. , Zhou , X. , and Rumminger , M. Experiments and Analysis of Diesel Particulate Filter Loading and Regeneration SAE Technical Paper 2000-01-3087 2000 10.4271/2000-01-3087
- Cooper , B. and Thoss , J. Role of NO in Diesel Particulate Emission Control SAE Technical Paper 890404 1989 10.4271/890404
- Uchisawa J. , Obuchi A. , Enomto R. , Nanba T. , Liu S. , and Kushiyama S. Applied Catalysis B Environmental 21 9 2001
- Konstandopoulos , A. , Papaioannou , E. , Zarvalis , D. , Skopa , S. et al. Catalytic Filter Systems with Direct and Indirect Soot Oxidation Activity SAE Technical Paper 2005-01-0670 2005 10.4271/2005-01-0670
- Hutton , C. , Johnson , J. , Naber , J. , and Keith , J. Procedure Development and Experimental Study of Passive Particulate Matter Oxidation in a Diesel Catalyzed Particulate Filter SAE Technical Paper 2012-01-0851 2012 10.4271/2012-01-0851