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Methods and systems for resistive particulate matter sensors

A particulate matter and sensor technology, which is applied in chemical instruments and methods, separation methods, particle and sedimentation analysis, etc., can solve the problems of reducing the sensitivity of soot sensors, corroding electrodes, and sensor gain offset, so as to reduce the corrosion of soot sensors , reduced warranty costs, and reduced gain offset effects

Active Publication Date: 2020-07-17
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, H released as a by-product of desulfurization 2 S can electrochemically react with the sensor electrodes, thereby corroding the electrodes and reducing the sensitivity of the soot sensor
For example, H 2 S reaction with soot sensor electrodes can cause sensor gain shift

Method used

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  • Methods and systems for resistive particulate matter sensors
  • Methods and systems for resistive particulate matter sensors
  • Methods and systems for resistive particulate matter sensors

Examples

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Embodiment Construction

[0019] The following instructions refer to operating the engine system (as in figure 1 Systems and methods for a particulate matter (PM) sensor or a soot sensor in an engine exhaust line downstream of a lean NOx trap (LNT) in an engine system of an engine system. A PM sensor configured with a pair of interdigitated electrodes can be Figure 2A to Figure 2B The multiple switches shown in are connected to positive voltage and ground. The controller can be configured to execute programs (eg, image 3 program) to change the switch position of the soot sensor in LNT and soot sensor based operation mode. The controller can also be configured to execute programs (eg, Figure 4 program) to operate the soot sensor in the particulate matter detection mode and regenerate the soot sensor based on the soot load on the soot sensor. Additionally, the controller may intermittently estimate the exhaust NOx level and SOx level of the LNT and execute routines (eg, Figure 5 program) to rege...

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Abstract

Methods and systems are provided for reducing soot sensor electrode degradation in harsh chemical environment introduced as a result of desulfation of a lean NOx trap positioned upstream of the soot sensor. In one example, a method may include in response to the SOx load being higher than the threshold, prior to initiating desulfation of LNT, operating the soot sensor in a pre-desulfation mode where the negative electrode is connected to the positive electrode for a brief duration, while the positive electrode is disconnected from the positive electrode. However during desulfation, when H2S is released as a by-product, both the electrodes may be open, i.e. not connected to the positive electrode or ground, thereby reducing the possibility of sensor degradation.

Description

technical field [0001] The present description generally relates to the design and use of resistive particulate matter (PM) sensors in exhaust gas streams that are robust in harsh chemical environments. Background technique [0002] Combustion exhaust is regulated emissions, and various exhaust aftertreatment devices located in the engine exhaust serve to monitor and control exhaust emissions. A diesel particulate filter (DPF) is typically used for particulate matter (PM) or soot control, and a lean NOx trap (LNT) is used for NOx control. Under lean conditions, LNTs adsorb nitrogen oxides (e.g., nitrogen monoxide, NO, and nitrogen dioxide, NO) produced during engine combustion. 2 , also referred to as NOx). Lean burn engine exhaust contains sulfur oxides (SOx) derived from fuel and lubricating oil, which compete with NOx for LNT adsorption sites. Unfortunately, SOx is preferentially adsorbed over NOx, and SOx forms stable sulfides with the LNT storage material. As a resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N13/00F01N11/00F01N9/00G01N15/00G01D21/02
CPCF01N9/00F01N11/00F01N13/008F01N2560/05G01D21/02G01N15/00G01N2015/0096B01D53/9422B01D53/9477B01D53/9495B01D2255/2042F01N3/021F01N3/0842F01N3/0885F01N13/0097F01N2560/20F02D41/028F02D41/1466F02D41/20F02D41/222G01N15/0606G01N15/0656G01N2015/0046Y02T10/12
Inventor D·C·维贝尔
Owner FORD GLOBAL TECH LLC
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