Twin-LNT System for advanced Diesel Exhaust Gas Aftertreatment

Paper #:
  • 2017-01-0935

Published:
  • 2017-03-28
Abstract:
The biggest challenge in emission control for compression ignited internal combustion engines is the suppression on NOx. In the US, NOx-levels have been regulated strictly for a long time, but recently the introduction of the real-world-driving legislation (RDE) aggravated the requirements in Europe dramatically; they can only be fulfilled by a system, that operates robustly under all driving conditions. Emission control is based on engine-internal optimizations to reduce the feedgas in conjunction with aftertreatment technologies, that are generally selective catalytic reduction (SCR) or lean NOx traps (LNT) based systems. Due to its ability to control high amounts of NOx, SCR is widely used in heavy-duty applications and is becoming more popular in light-duty and passenger car applications as well. This work in contrast shows, that the LNT concept can be enhanced significantly to also offer robust emission control, offering good cold-start capabilities, package advantages and the lack of customer-interaction for refill of the diesel exhaust fluid. The solution uses a twin LNT technology package, designed to provide a contiguous emission control window ideal for high and low dynamic driving. The interactions when cleaning both LNTs from stored NOx are investigated, the requirements of purges and their performance are analysed. This is coupled with an intensive investigation of sulphur storage and release.
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