| 摘要 |
The present invention provides systems and methods to improve the performance and emission control of internal combustion engines equipped with nitrogen oxides storage-reduction ("NSR") emission control systems. The system comprises a NSR catalyst (206), a fuel processor (200) located upstream o the NSR catalyst, and at least one fuel injection port (208). The fuel processor (200) converts a fuel into a reducing gas mixture comprising CO and H 2. The reducing gas mixture is then fed into the NSR catalyst (206), where it regenerates the NSR adsorbent, reduces the NOx to nitrogen, and optionally periodically desulfates the NSR catalyst. The fuel processor (200) comprises one or more catalysts (308), which facilitate reactions such as combustion, partial oxidation, and/or reforming and help consume excess oxygen present in an engine exhaust stream. The methods of the present invention provide for NSR catalyst adsorbent regeneration using pulsed fuel flow. Control strategies are also provided. |
