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Exhaust aftertreatment system for an internal combustion engine and method for operating same

  • US 9,243,537 B1
  • Filed: 09/17/2014
  • Issued: 01/26/2016
  • Est. Priority Date: 09/17/2014
  • Status: Active Grant
First Claim
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1. An exhaust aftertreatment system for an engine, comprising:

  • an exhaust valve assembly having a first port, a second port, and a third port, the exhaust valve assembly being configured to effect selective fluid communication between the first port, the second port, and the third port;

    an exhaust conduit fluidly coupled to an exhaust port of the engine and fluidly coupled to the first port of the exhaust valve assembly;

    an exhaust aftertreatment device fluidly coupled to the second port of the exhaust valve assembly;

    a bypass conduit fluidly coupled to the third port of the exhaust valve assembly, the bypass conduit configured to bypass a flow of exhaust around the exhaust aftertreatment device;

    a reductant supply in selective fluid communication with the exhaust conduit; and

    a controller operatively coupled to the exhaust valve assembly, the reductant supply, and the engine, the controller being configured to regenerate the exhaust aftertreatment device according to a first regeneration procedure when the engine operates in a substantially non-premixed mode, the first regeneration procedure includingdelivering a first flow of reductant from the reductant supply to the exhaust aftertreatment device,effecting fluid communication between the first port and the second port, andblocking fluid communication between the first port and the third port.

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