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Method and system for exhaust particulate matter sensing

A technology of particulate matter and exhaust pipes, which is applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc., which can solve the problem of error indication function filter replacement, sensor fluctuations, and reduced sensitivity and other issues, to achieve the effect of improving the compliance rate of exhaust emissions, reducing maintenance costs, and enhancing repeatability

Active Publication Date: 2022-03-08
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With reduced sensitivity, the soot sensor may not be able to determine a particle filter leak in a reliable manner
Therefore, errors in the sensors may cause false indications of DPF degradation and unnecessary replacement of functional filters
[0005] On the other hand, if the sensor is mounted at the bottom of the exhaust pipe, as shown in US8310249B2 by Paterson, water condensed at the bottom of the exhaust pipe can overflow into the sensor element, thereby contaminating the sensor element. sensor element
Such contamination of the sensor element may cause fluctuations in the output of the sensor, thereby reducing the accuracy of estimating particulate loading on the particulate filter

Method used

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  • Method and system for exhaust particulate matter sensing
  • Method and system for exhaust particulate matter sensing
  • Method and system for exhaust particulate matter sensing

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Embodiment Construction

[0020] The following description refers to methods for sensing engine systems such as figure 1 Systems and methods for particulate matter (PM) in the exhaust stream of an engine system shown in . A PM sensor may be placed in the exhaust passage of the engine system. The PM sensor may comprise a spherical assembly comprising a plurality of flow tubes and support rods attached to diametrically opposed ends of the spherical assembly. The ball assembly can be mounted to the bottom of the exhaust duct with the help of a support rod. Specifically, the spherical assembly includes an inner spherical device positioned within an outer spherical device and spaced apart by a gap, and the plurality of flow tubes includes an inner tube positioned within the outer tube and spaced apart by a gap ,like Figure 2A shown in . Alternatively, a rounded spherical element can be positioned within the inner device, and the exhaust gas can be directed towards the sensor element with the help of pe...

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Abstract

The present invention provides methods and systems for positioning a particulate matter sensor downstream of a diesel particulate filter in an exhaust system. In one example, a particulate matter sensor may comprise a spherical assembly comprising a hollow rod connected to diametrically opposed ends of the assembly and a plurality of flow tubes; and a sensor element positioned within the assembly remote from the plurality of flow tubes , thus protecting the sensor element from contaminants and water droplets condensing at or near the multiple flow tubes. Additionally, the support rod may additionally contain a drain hole to allow larger particles to flow out of the spherical assembly and into the exhaust duct.

Description

technical field [0001] The present invention relates to sensing particulate matter in an exhaust system. Background technique [0002] Engine emission control systems may utilize a variety of exhaust gas sensors. One example sensor may be a particulate matter sensor that indicates particulate matter mass and / or concentration in the exhaust. In one example, the particulate matter sensor is operable by accumulating particulate matter over time and providing an indication of the extent of accumulation as a measure of exhaust particulate matter levels. A particulate matter sensor may be located upstream and / or downstream of the diesel particulate filter and may be used to sense particulate matter loading on the particulate filter and diagnose operation of the particulate filter. [0003] An example of a PM sensor is shown in US 20120085146A1 by Maeda et al. Therein, a particulate matter sensor is attached to the top of the exhaust pipe and housed within a cylindrical protecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/0656F01N2560/05G01N2015/0046F01N9/00G01N15/0606F01N2560/20F01N11/00Y02T10/40F01N3/033
Inventor 张小钢
Owner FORD GLOBAL TECH LLC