Impacts of Drive Cycle and Ambient Temperature on Gasoline Particulate Filter Performance Based on the In-vehicle Verification Test Data

Paper #:
  • 2018-01-0949

Published:
  • 2018-04-03
Abstract:
Gasoline Particulate Filter (GPF) is used as an efficient solution to reduce particular matter (PM) emissions on gasoline vehicles. GPFs are generally ceramic wall-flow filters and located downstream of conventional three-way catalysts [1]. The study in this paper is intended to evaluate the impact of drive cycle and ambient temperature on GPF regeneration and soot generation. The test data were obtained through real road testing in China cities including Nanjing, Hainan and Harbin. Five 2.0L GTDI prototype vehicles from respective China stage 6 were employed. The results indicated that a drive cycle with low engine speed and engine load, like typical city road in rush hour of Nanjing which was not easy to make the GPF having the required high enough temperature and the chance of rich oxygen to regenerate itself. However, soot was generated as expected of the control strategy [2] and the capacity of the burning model in regeneration was enough to clean out the soot prior to accumulating it much. Regeneration happened when the GPF temperature achieved 600 °C as required then mostly at the vehicle speed higher than 30 mph. Through deep analyzed the drive cycles to understand its impact on regeneration from the view of temperature and feeding oxygen side. In addition, soot would be generated much more than the normal condition during cold start at the low ambient temperature. Base on the test data collected in Harbin, soot accumulation for each cold start trip was about 0.15 to 0.3 g/L when the ambient temperature was lower to the range from -23 to -13 °C. In fact, engine coolant temperature is the inherent decisive factor on determining how much soot would be generated.
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