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Method and system for exhaust particulate matter sensing

A particulate matter and sensor technology, applied in exhaust devices, measuring devices, instruments, etc., can solve problems such as prolonging processing time, data output and diagnosis, electric field attenuation, and reducing sensitivity

Pending Publication Date: 2016-08-10
FORD GLOBAL TECH LLC
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  • Application Information

AI Technical Summary

Problems solved by technology

The PM sensor described by Roth et al. may continue to have reduced sensitivity due to the undesirable electrostatic attraction experienced by PMs disposed away from the sensor surface in the electric field generated by the electrode pair
Although the strength of the electric field in the region between the interdigitated electrode pairs of each plane is higher near the surface of the electrode pairs, the electric field decays rapidly thereafter
Furthermore, the sensor output of Roth et al. requires analysis with extensive algorithms to derive meaningful information about PM in the exhaust, resulting in prolonged processing times and undesired delays in data output and diagnostics

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

Examples

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Embodiment Construction

[0019] The following description relates to systems and methods for measuring the amount of particulate matter stored on an engine exhaust particulate filter, such as in figure 1 in the vehicle system. Configured with gaps ( figure 2 to Fig. 3) A particulate matter (PM) sensor with a pair of spaced electrodes may be located downstream or upstream of the diesel particulate filter. The electrodes can be operated with a voltage bias relative to each other to increase the electrostatic force exerted on the exhaust soot particles, thereby improving soot buildup on the sensor ( Figure 4 to Figure 5 ). The controller can be configured to execute control programs such as Figure 6 The program regenerates the particulate filter based on the output of the pressure sensor and performs diagnostics on the particulate filter based on the output of the PM sensor ( Figure 9 ). Additionally, the controller can intermittently clean the PM sensor ( Figure 7 ) to enable continued PM mon...

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Abstract

The invention relates to a method and system for exhaust particulate matter sensing. Methods are described for increasing the sensitivity of particulate matter detection in an exhaust system of a vehicle. An example particulate matter sensor assembly comprises a pair of planar interdigitated electrode structures held at a voltage bias with respect to each other. An alternate embodiment may comprise a planar interdigitated electrode pair, and a conducting plate assembly again held at a voltage bias with respect to the planar interdigitated electrode pair. The bias may overlay an additional electric field drive, which improves the capture of soot particles on the sensor assembly surface thereby increasing sensitivity of particulate matter sensors.

Description

technical field [0001] The present invention generally relates to the design and use of resistive particulate matter (PM) sensors in exhaust gas streams. Background technique [0002] Diesel engine combustion exhaust is a regular emission. Diesel particulate matter (PM) is the particulate constituent of diesel engine exhaust that includes diesel soot and aerosols such as dust particles, metal wear particles, sulfates and silicates. When PM is released into the atmosphere, PM can appear as individual particles or chain-like aggregates, mostly in the invisible submicron range of 100 nanometers. Various techniques have been developed to identify and filter exhaust PM before it is released into the atmosphere. [0003] As one example, soot sensors, also known as PM sensors, may be used in vehicles with internal combustion engines. A PM sensor may be located upstream and / or downstream of a diesel particulate filter (DPF) and may be used to sense PM load on the filter and diagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
CPCG01N27/043G01N2015/0046G01N15/0656B03C3/68F01N3/027
Inventor D·J·库宾斯凯
Owner FORD GLOBAL TECH LLC
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