Diesel exhaust fluid tank venting system
AssigneeStant USA Corp.
InventorsPaul C. Wetzel, Jason M. Crawford
Life of this patent
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Abstract
An exhaust after-treatment system associated with a diesel engine includes a diesel exhaust fluid storage unit. The storage unit includes a diesel exhaust fluid tank and a vent system coupled to the tank and configured to regulate flow of air into the tank and fluid vapor out of the tank.
Claims16
A diesel exhaust fluid storage unit adapted to supply a metered amount of diesel exhaust fluid provided in a diesel exhaust fluid tank to a mixing zone in an exhaust pipe coupled to a diesel engine, the diesel exhaust fluid storage unit comprising
- a diesel exhaust fluid tank venting control unit formed to include a fill-limit valve module adapted to receive diesel exhaust fluid from a diesel exhaust fluid tank, a breather-valve module exposed to the atmosphere, and a vapor-transfer module interposed between and coupled in fluid communication to each of the fill-limit valve module and the breather-valve module, wherein the breather-valve module includes an interior chamber and a semi-permeable membrane having a topside exposed to atmospheric air admitted into the interior chamber and an underside exposed to fluid vapor associated with diesel exhaust fluid in the diesel exhaust fluid tank and fluid vapor conducted through vapor transfer module.
A diesel exhaust fluid storage unit adapted to supply a metered amount of diesel exhaust fluid provided in a diesel exhaust fluid tank to a mixing zone in an exhaust pipe coupled to a diesel engine, the diesel exhaust fluid storage unit comprising
- an elongated sleeve including, in series, a lower portion, a middle portion, and an upper portion,
- wherein the lower portion of the elongated sleeve is formed to include a float chamber and a fill-limit valve mounted for up-and-down movement in the float chamber to open and close an inlet into a first fluid-conducting passageway formed in the middle portion of the elongated sleeve,
- wherein the middle portion of the elongated sleeve is also formed to include a second fluid-conducting passageway separate from the first fluid-conducting passageway and arranged to communicate fluid vapor and atmospheric air between the fill-limit valve module and the upper portion of the sleeve, and
- wherein the upper portion of the elongated sleeve is formed to include an interior chamber open to atmospheric air and a semi-permeable membrane having a topside exposed to atmospheric air admitted into the interior chamber and an underside exposed to fluid vapor conducted through the second fluid-conducting passageway.
A diesel exhaust fluid storage unit adapted to supply a metered amount of diesel exhaust fluid provided in a diesel exhaust fluid tank to a mixing zone in an exhaust pipe coupled to a diesel engine, the diesel exhaust fluid storage unit comprising
- a diesel exhaust fluid tank formed to include an interior region and a unit-mount aperture formed in a top wall of the diesel exhaust fluid tank to open into the interior region and
- a tank venting control unit arranged to extend into the interior region of the diesel exhaust fluid tank through the unit-mount aperture, wherein the tank venting control unit includes a fill-limit valve module located in the interior region of the diesel exhaust fluid tank, a breather-valve module located outside of the interior region of the diesel exhaust fluid tank in spaced-apart relation to the top wall of the diesel exhaust fluid tank, and a vapor-transfer module located outside of the interior region of the diesel exhaust fluid tank and interposed between and in fluid communication with each of the fill-limit valve and breather-valve modules.
Dependencies are inferred from the claim text.