CPC B01D 53/9495 (2013.01) [B01D 53/9418 (2013.01); B01D 53/9431 (2013.01); B01D 53/944 (2013.01); F01N 3/106 (2013.01); F01N 3/2013 (2013.01); F01N 3/2066 (2013.01); F01N 3/2892 (2013.01); F01N 3/32 (2013.01); F01N 3/36 (2013.01); F02D 41/024 (2013.01); B01D 2251/2067 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/50 (2013.01); B01D 2255/91 (2013.01); B01D 2257/404 (2013.01); B01D 2258/012 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/08 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1602 (2013.01)] | 8 Claims |
1. An exhaust system for an internal combustion engine, comprising:
a combustor air pump selectively supplying air to a combustor positioned along a first passage;
a second passage arranged in parallel with the first passage;
a three-way valve coupled to the first passage and the second passage downstream of the combustor;
a third passage positioned downstream of the three-way valve;
a fourth passage positioned in parallel with the third passage, the third passage and the fourth passage fluidically coupled to a fifth passage, the fifth passage fluidically coupled to an engine exhaust passage;
a passive NOx absorber (PNA) positioned along the engine exhaust passage;
a selective catalyst reduction (SCR) catalyst positioned along the engine exhaust passage downstream of the PNA; and
a NOx sensor positioned along the engine exhaust passage downstream of the SCR.
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