Particulate matter sensor with engineered particle size cut-off point

A technology of particulate matter and sensor, which can be used in the separation of dispersed particles, filtration of dispersed particles, instruments, etc., and can solve problems such as increasing emissions

Active Publication Date: 2020-08-04
CUMMINS EMISSION SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such cases, large particles larger than the Greenfield gap size range (typically intercepted by particulate filters) also pass through the filter and significantly increase PM emissions

Method used

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  • Particulate matter sensor with engineered particle size cut-off point
  • Particulate matter sensor with engineered particle size cut-off point
  • Particulate matter sensor with engineered particle size cut-off point

Examples

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Embodiment Construction

[0020] Embodiments described herein relate generally to systems and methods for detecting failure of a particulate filter of an aftertreatment system using a PM sensor assembly. In various embodiments, the systems and methods described herein include a PM sensor assembly including a PM sensor within a housing. The housing is configured to redirect the flow of exhaust gas entering the housing so that only large particles having a size greater than a predetermined size range (corresponding to a minimum effective filter size range of the particulate filter) impinge on and accumulate on the PM sensor. This accumulation causes changes in the electrical parameters of the PM sensor to indicate a malfunction of the particulate filter.

[0021] Conventional aftertreatment systems typically include particulate filters (such as figure 1 PM sensor downstream of the particulate filter 110). The PM sensor generally includes an accumulation type sensor that allows particles included in PM ...

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Abstract

An aftertreatment system includes a particulate filter configured to filter PM having a predetermined minimum effective size range included in exhaust gas flowing through the aftertreatment system. A PM sensor assembly is located downstream of the particulate filter and includes a housing having an inlet, an outlet, and side walls and defining an interior volume. A PM sensor is located within the interior volume. The housing is configured to redirect the flow of exhaust gas entering the PM sensor assembly around the PM sensor such that small particles having a first size included in the flow of exhaust gas that are within a predetermined size range or less than the predetermined size range surround the particles The substance sensor is directed. Large particles having a second size greater than the predetermined size range impinge on the PM sensor. A controller is communicatively coupled with the PM sensor.

Description

technical field [0001] The present application relates generally to aftertreatment systems for internal combustion (IC) engines. Background technique [0002] Exhaust aftertreatment systems are used to receive and treat exhaust gases produced by IC engines. Conventional exhaust gas aftertreatment systems include any of several different components to reduce the levels of harmful exhaust emissions present in the exhaust gas. For example, some exhaust aftertreatment systems for diesel-powered IC engines include selective catalytic reduction (SCR) catalysts to react with ammonia (NH 3 ) in the presence of NOx (a certain proportion of NO and NO 2 ) into harmless nitrogen (N 2 ) and water vapor (H 2 O). [0003] Many aftertreatment systems include a particulate filter (eg, a diesel particulate filter [DPF]) upstream of the SCR system. The particulate filter is configured to filter particulate matter (PM), such as soot entrained within exhaust gases flowing through the after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCF01N3/021F01N2550/00F01N2560/05G01N2015/0046B01D46/44G01N1/2252G01N15/0255G01N15/0606G01N15/0656G01N2015/0261F01N11/00Y02T10/12Y02T10/40F01N2250/00B01D46/0086B01D46/442B01D46/446B01D2279/30F01N2550/04G01N15/0826G01N2015/084G07C5/0825
Inventor C·M·克里米恩斯A·耶泽瑞特R·普拉提帕提M·A·罗宾逊
Owner CUMMINS EMISSION SOLUTIONS
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