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System and method for sampling of fluid

A technology of fluid communication and exhaust flow, which is applied in the field of sampling chute for exhaust flow sampling, and can solve problems such as inaccurate readings and damage to NOx sensors

Inactive Publication Date: 2015-06-17
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the reading provided by the NOx sensor will always be inaccurate because the exhaust flow will contact the relatively small surface area of ​​the NOx sensor
Additionally, the NOx sensor present in the exhaust outlet can be damaged due to water or debris entering the exhaust outlet

Method used

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  • System and method for sampling of fluid
  • System and method for sampling of fluid
  • System and method for sampling of fluid

Examples

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Embodiment Construction

[0013] Where possible, the same reference numbers will be used in all drawings to refer to the same or similar components. reference figure 1 , An exemplary exhaust system 100 of an engine (not shown) is shown. The exhaust system 100 includes an outlet 101. The outlet 101 is positioned downstream of the selective catalytic reduction (SCR) catalyst of the aftertreatment system 102 of the engine with respect to the exhaust gas flow direction in the system. In the figure, the aftertreatment system 102 is enclosed in a housing 104. The aftertreatment system 102 is configured to introduce reductant into the exhaust flow of the engine. The exhaust stream may include one or more components, such as carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), and other similar components in the gaseous state. In one embodiment, the aftertreatment system 102 may introduce a reducing agent to reduce and / or convert a certain amount of NOx present in the exhaust gas stream into ot...

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PUM

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Abstract

A system including a sampling flute is provided. The sampling flute defines a conduit therein. The sampling flute includes a plurality of holes configured for allowing passage of an exhaust gas flow therethrough. The system also includes a hood provided on the sampling flute. The hood is configured to enclose a nitrogen oxide sensor therein. The hood includes an inlet in fluid communication with the sampling flute. The hood also includes an outlet positioned opposed to the inlet. The hood is configured to cause the exhaust gas flow to impact a side of the nitrogen oxide sensor.

Description

Technical field [0001] The present invention relates to a system and method for fluid sampling, and more specifically to a sampling chute for exhaust gas flow sampling. Background technique [0002] Nitrogen oxide sensors (NOx sensors) can be located at multiple locations within the engine system to measure the concentration of nitrogen oxides in exhaust gas flowing through the system. For example, the NOx sensor may be present downstream of the outlet of the selective catalytic reduction (SCR) catalyst with respect to the exhaust gas flow direction. [0003] The reading provided by the NOx sensor is based on a portion of the exhaust gas flowing over it. However, in some cases, due to its position within the exhaust duct of the exhaust system, the NOx sensor may be in contact with a relatively small portion of the exhaust gas flow. Known designs include providing a sampling element in the exhaust outlet to direct a part of the exhaust flow above the NOx sensor so that the guided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N13/08F01N3/28G01N1/22
CPCG01N1/2252G01N33/0037F01N13/008F01N2240/20F01N2560/026F01N3/2066Y02A50/20Y02T10/12G01N1/22
Inventor A·M·德尼斯M·P·百格S·S·德施穆克E·P·斯佩斯
Owner CATERPILLAR INC