Constant mass flow injection system
AssigneeCummins Emission Solutions Inc.
InventorDouglas A. Mitchell
Life of this patent
Estimating the term…
Abstract
Exhaust aftertreatment assemblies and methods of manufacturing and operating exhaust aftertreatment assemblies. The exhaust aftertreatment assembly includes a reductant delivery device, a reductant source fluidly coupled to the reductant delivery device, a mixing chamber positioned between the reductant delivery device and the reductant source and thereby fluidly coupling the reductant source to the reductant delivery device, and a compressed air source fluidly coupled to the mixing chamber upstream of the mixing chamber with respect to the reductant delivery device. The compressed air source provides compressed air to mix with reductant in the mixing chamber.
Claims24
An exhaust aftertreatment assembly, comprising:
- a reductant delivery device;
- a reductant source fluidly coupled to the reductant delivery device;
- a mixing chamber fluidly coupled to the reductant delivery device, the mixing chamber positioned between the reductant delivery device and the reductant source and thereby fluidly coupling the reductant source to the reductant delivery device;
- and
- a compressed air source fluidly coupled to the mixing chamber upstream of the mixing chamber with respect to the reductant delivery device, the compressed air source providing compressed air so as to mix with reductant in the mixing chamber.
An engine assembly, comprising:
- an internal combustion engine;
- an exhaust aftertreatment system fluidly coupled to the internal combustion engine;
- a reductant delivery device fluidly coupled to the exhaust aftertreatment system;
- a reductant source fluidly coupled to the reductant delivery device;
- a mixing chamber positioned between the reductant delivery device and the reductant source, the mixing chamber fluidly coupling the reductant source to the reductant delivery device;
- and
- a compressed air source fluidly coupled to the mixing chamber upstream of the mixing chamber with respect to the reductant delivery device, the compressed air source providing compressed air to mix with reductant in the mixing chamber.
A method of treating engine exhaust comprising:
- determining a difference between a predetermined optimized mass flow rate for a reductant delivery device fluidly coupled to an exhaust aftertreatment system and a commanded reductant mass flow rate of reductant from a reductant source fluidly coupled to the exhaust aftertreatment system, the commanded reductant mass flow rate determined to treat an exhaust stream of exhaust in the exhaust aftertreatment system by injection of the reductant via the reductant delivery device into the exhaust aftertreatment system, the predetermined optimized mass flow rate determined to produce equalized fluid flow from a plurality of injection apertures in the reductant delivery device;
- and
- causing, based on the determined difference and in response to a release of the reductant, mixing, in a mixing chamber upstream of the reductant delivery device, of a quantity of compressed air from a compressed air source with the reductant released from the reductant source pursuant to the commanded reductant mass flow rate of reductant.
A control system for treating an engine exhaust stream comprising:
- a sensing module electrically coupled to at least one regulator configured to cause release of reductant from a reductant source fluidly coupled to the exhaust aftertreatment system at a commanded reductant mass flow rate, the sensing module configured to determine a difference between a predetermined optimized mass flow rate for a reductant delivery device fluidly coupled to the exhaust aftertreatment system and the commanded reductant mass flow rate of reductant from the reductant source, the predetermined optimized mass flow rate determined to produce equalized fluid flow from a plurality of injection apertures in the reductant delivery device;
- and
- an actuation module configured to cause a quantity of compressed air from a compressed air source to mix with the reductant released from the reductant source.
A method of treating engine exhaust comprising:
- mixing a reductant with compressed air in a mixing chamber fluidly coupled to a reductant delivery device upstream of the reductant delivery device;
- transferring the reductant and compressed air mixture from the mixing chamber to the reductant delivery device;
- and
- injecting the reductant and compressed air mixture into an exhaust aftertreatment system coupled to an internal combustion engine.
Dependencies are inferred from the claim text.