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COMBUSTION DRIVEN AMMONIA GENERATION STRATEGIES FOR PASSIVE AMMONIA SCR SYSTEM

  • US 20140102081A1
  • Filed: 10/16/2012
  • Published: 04/17/2014
  • Est. Priority Date: 10/16/2012
  • Status: Active Grant
First Claim
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1. A method for controlling ammonia generation in an exhaust gas feedstream output from an internal combustion engine equipped with an exhaust aftertreatment system including a first aftertreatment device, comprising:

  • executing an ammonia generation cycle to generate ammonia on the first aftertreatment device, said ammonia generation cycle comprising;

    determining a desired air-fuel ratio of the engine to generate an engine-out exhaust gas feedstream conducive for generating ammonia on the first aftertreatment device; and

    selectively altering operation of a selected combination of a plurality of cylinders of the engine such that the desired air-fuel ratio of the engine is achieved.

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