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Reductant dosing unit with flow variability reduction and purge improvement device

A feeding, dosing technology for RDU inserts that solves problems such as damaged injectors

Active Publication Date: 2019-06-21
VITESCO TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Injector 18 could be damaged by DEF expansion without purge

Method used

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  • Reductant dosing unit with flow variability reduction and purge improvement device
  • Reductant dosing unit with flow variability reduction and purge improvement device
  • Reductant dosing unit with flow variability reduction and purge improvement device

Examples

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Embodiment Construction

[0031]The following description of the exemplary embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application or uses. Unless otherwise stated, the terms "upstream" and "downstream" are intended with respect to the flow of DEF through the RDU injector.

[0032] now refer to Figure 3A and 3B , shows an RDU insert 30 according to an exemplary embodiment. Insert 30 fits within cup 14 of an otherwise conventional RDU 10 and is sized and dimensioned to fit at least partially within the upstream end of inlet pipe 20 of conventional RDU injector 18 . A part of the insert 30 extends from the inlet pipe 20 in the upstream direction. As such, the insert 30 occupies a space within the cup 14 of the RDU 10 that would otherwise be occupied by DEF and / or one or more air bubbles. Since there is less space available for DEF and / or air bubbles, less DEF needs to be purged and less air in the RDU 10 during purge operations, which could other...

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PUM

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Abstract

The invention relates to a reductant dosing unit with flow variability reduction and a purge improvement device. The dosing unit having a fluid path defined therethrough and including a fluid injectorhaving an inlet tube; an inlet cup sized and shaped for receiving therein at least part of the inlet tube of the fluid injector, the inlet cup including a fluid inlet; an input tube in fluid communication with the inlet cup via the fluid inlet thereof, the input tube configured to receive fluid from a fluid source; and an insert partly disposed in the inlet tube of the fluid injector, the insertat least partly defining a fluid passage. The fluid passage is in fluid communication with the input tube and the inlet tube of the fluid injector and forms part of the fluid path of the dosing unit.The fluid passage includes a portion extending in a direction that is orthogonal to a longitudinal axis of the fluid injector.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application 62 / 598,434, filed December 13, 2017, entitled "REDUCTANT DOSING UNIT WITH FLOWVARIABILITY REDUCTION AND PURGE IMPROVEMENT DEVICE," the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates generally to a reductant dosing unit (RDU), and in particular to an RDU insert that reduces flow variability and increases reductant purge capability. Background technique [0004] Diesel exhaust fluid (DEF) is used as a reductant in diesel engines to reduce NOx emissions. DEF is pumped from the storage tank to the RDU via flexible hydraulic lines. The RDU has a hydraulic connection to mate with the flexible line and the RDU inlet cup. The inlet cup is typically the highest point on the RDU when the RDU is attached to the vehicle's exhaust pipe. The RDU inlet cup feeds a DEF injector in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/2066F01N2610/02F01N2610/1453Y02T10/12Y02A50/20B05B1/02B05B9/007F01N3/208F01N2610/1493
Inventor R.W.麦克法兰K.A.肖C.M.考尔金斯
Owner VITESCO TECH USA
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