Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and system for exhaust particulate matter sensing

A technology of particulate matter and sensors, which is applied in the direction of electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc. Reflects problems such as DPF filtering ability

Active Publication Date: 2017-05-17
FORD GLOBAL TECH LLC
View PDF14 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, increased exhaust flow may cause a decrease in the amount of aggregates falling to the ground, resulting in a decrease in the measured current
Likewise, a reduced exhaust flow rate can increase the amount of aggregates reaching the ground, causing peaks in the measured current
Due to these current transients in the sensor output, sensors that capture soot exiting the DPF may not be a true reflection of the DPF filtering capabilities

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The following instructions relate to sensing engine systems such as figure 1 Particulate matter (PM) in the exhaust stream of the engine system shown in . A PM sensor placed in an exhaust passage of an engine system may include two traps separated from each other by a gap. PM entering the PM sensor can accumulate and be charged by the first trap operating at a higher voltage, and aggregates can form. Aggregates may separate from and exit the first trap and then enter the second trap, where the aggregates may be captured by the second trap operating at a lower voltage. An example embodiment of a PM sensor is in figure 2 and image 3 shown in . The controller can be configured to execute control routines such as image 3 routine to measure the PM load on the sensor based on the current measured across the second trap. Alternatively, the controller can clean the trap intermittently (as in Figure 5 shown in the presented method) to allow continued PM detection and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method and system for exhaust particulate matter sensing, and provides methods and systems for sensing particulate matters by a particulate matter sensor positioned downstream of a diesel particulate filter in an exhaust system. In one example, the method may include accumulating incoming particulate matters by applying a higher bias to a first trap of the particulate matter sensor, and further charging the particulate matters and forming highly charged dendrites. The method further includes capturing the dendrites exiting the first trap by applying a lower bias to a second trap also housed within the same particulate matter sensor, thereby reducing the effects of exhaust flow rate on the particulate matter sensor and further increasing the sensitivity of the particulate matter sensor.

Description

technical field [0001] The present invention generally relates to the design and use of particulate matter (PM) sensors in exhaust streams. Background technique [0002] Diesel engine combustion may produce emissions including particulate matter (PM). Particulate matter may include diesel soot and aerosols such as ash particles, metal wear particles, sulfates, and silicates. When released into the atmosphere, PM can be in the form of individual particles or chain aggregates, with the majority of PM in the invisible submicron range of 100 nanometers. Various techniques have been developed for identifying and filtering out exhaust PM before it is released into the atmosphere. [0003] As one example, PM or soot 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 the PM load on the filter and diagnose the operation of the DPF. A resistive PM sens...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/0606G01N15/0656F01N3/021F01N9/002F01N11/00F01N2550/04F01N2560/05G01N2015/0046Y02T10/12Y02T10/40G01N15/00F01N3/023F01N2570/10
Inventor D·比尔比
Owner FORD GLOBAL TECH LLC