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US 2018/0023447 A1Published application
Urea mixer
AssigneeFord Global Technologies, LLC
InventorXiaogang Zhang
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a urea mixer. In one example, a urea mixer may include a tube for mixing exhaust gas with urea outside of a main exhaust passage.
Claims20
A mixer comprising:
- a concave plate located inside an exhaust passage with an opening fluidly coupling the exhaust passage to an auxiliary passage having a urea injector, and where the auxiliary passage is fluidly coupled to a hollow ring physically coupled to an outer surface of the exhaust passage, and where the hollow ring is upstream of the concave plate relative to a direction of incoming engine exhaust gas flow.
A method comprising:
- injecting a reductant outside of a main exhaust passage into a tube of a mixer configured with an opening in a downstream portion of the mixer in the main exhaust passage to conduct exhaust gas into the tube for mixing with the reductant outside the main exhaust passage;
- and
- flowing the reductant and exhaust gas parallel to and outside of the main exhaust passage via the tube to an upstream portion of the mixer configured to angularly expel the reductant and exhaust gas into the main exhaust passage.
A urea mixer comprising:
- a curved downstream portion and an annular upstream portion cascaded along an exhaust pipe of an exhaust passage, the upstream portion located outside of the exhaust pipe and the downstream portion located interior to the exhaust pipe;
- a first plurality of perforations located along a portion of the exhaust pipe corresponding to a location of the upstream portion and a second plurality of perforations located along the downstream portion;
- and
- an injector positioned to inject urea outside the exhaust passage along a vertical axis parallel to a central axis of the upstream portion into a tube.
1 more element
Dependencies are inferred from the claim text.