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Reductant dosing unit with flow variation reduction and purge improvement

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

Active Publication Date: 2022-04-19
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 variation reduction and purge improvement
  • Reductant dosing unit with flow variation reduction and purge improvement
  • Reductant dosing unit with flow variation reduction and purge improvement

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 specified, the terms "upstream" and "downstream" are intended to be relative to the flow of DEF through the RDU injector.

[0032] reference now Figure 3A and 3B , showing an RDU insert 30 according to an exemplary embodiment. The insert 30 fits within the cup 14 of the otherwise conventional RDU 10 and is sized and dimensioned to fit at least partially in the upstream end of the inlet pipe 20 of the conventional RDU injector 18 . A portion of the insert 30 extends from the inlet pipe 20 in the upstream direction. In this way, the insert 30 occupies a space within the cup portion 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 bubbles, less DEF needs to be purged and less air in the RDU 10 during a ...

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PUM

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Abstract

The present invention relates to a reductant dosing unit with flow variation reduction and purge improvement. A dose delivery unit has a fluid path defined therethrough and includes a fluid injector having an inlet tube; an inlet cup sized and shaped to receive at least a portion of the inlet tube of the fluid injector therein, the inlet The cup includes a fluid inlet; an inlet tube in fluid communication with the inlet cup through the fluid inlet of the inlet cup, the inlet tube being configured to receive fluid from a fluid source; and an insert partially disposed in the inlet tube of the fluid injector , the insert at least partially defines the fluid pathway. A 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 normal to the longitudinal axis of the fluid injector.

Description

[0001] CROSS-REFERENCE 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 WITHFLOW VARIABILITY REDUCTION AND PURGE IMPROVEMENT DEVICE," the contents of which are incorporated herein 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 hydraulic connections to mate with the flexible line and the RDU inlet cup. When the RDU is attached to the exhaust pipe of a vehicle, the inlet cup is usually the highest point on the RDU. The RDU inlet cup feeds DEF injectors in the ...

Claims

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Application Information

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Patent Type & Authority Patents(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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