Patent ID: 7665296

Claim:
A dual trap emissions adsorber system for controlling nitrogen oxide emissions from an internal combustion engine exhaust stream, comprising: a) a first NOx trap; b) a second NOx trap arranged for parallel flow with said first NOx trap; c) a first valve disposed between entrances to said first and second NOx traps and in communication with said engine, said first valve being capable of diverting said engine exhaust stream through alternative flow paths consisting of said first NOx trap, said second NOx trap, and said first and second NOx traps simultaneously; d) a source of reductant for regeneration of said first and second NOx traps; and e) a second valve disposed between entrances to said first and second NOx traps and in communication with said source of reductant, said second valve being capable of diverting said reductant through alternative flow paths consisting of said first NOx trap and said second NOx trap to regenerate one of said first and second NOx traps, wherein said first valve discommunicates said engine exhaust stream from said NOx trap being regenerated.