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Method and system for exhaust particulate matter sensing

A particulate matter and particle technology, applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc., can solve the problems of untrue response DPF filtration capacity, pollution, and affecting the sensitivity of PM sensors

Inactive Publication Date: 2020-11-03
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PM sensors that trap PM leaving the DPF can untruely reflect DPF filtration capabilities with increased dependence on exhaust flow rate
In addition, PM sensors may be susceptible to contamination by collisions of water droplets and / or larger particulates present in the exhaust gas, thus affecting PM sensor sensitivity and causing PM sensor output errors

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

[0014] The following description refers 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 a flow controller and a first flow diverter positioned adjacent an inlet of the PM sensor. The inlet opening of the PM sensor can be adjusted based on the exhaust flow rate by rotating the flow controller of the PM sensor, such as Figure 2A and Figure 2B shown. The controller can be configured to carry out control routines such as image 3 routine in ) to adjust the opening amount of the inlet opening of the PM sensor based on the exhaust gas flow rate. Additionally, the controller can intermittently clean the PM sensor (as in Figure 4 shown in the method presented here) to achieve continuous PM detection and carry out a diagnosis of a particulate filter positioned upstream of the PM sensor based on the output of the PM sensor (as in Fig...

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Abstract

The present invention relates to methods and systems for exhaust particulate matter sensing. Methods and systems are provided for sensing particulate matter in an exhaust system by a particulate matter sensor positioned downstream of a diesel particulate filter. In one example, the method may include, when the exhaust flow rate drops below a threshold, increasing the inlet opening of the particulate matter sensor to allow more particles to enter the particulate matter sensor, and further comprising, when the exhaust flow rate increases When high above the threshold, the inlet opening is reduced to reduce particle entry into the sensor. By adjusting the amount of particulates entering the sensor based on the exhaust rate, the rate of sensor deposition and thus sensor sensitivity to exhaust flow rate can be maintained at a desired level and is independent of exhaust flow rate.

Description

technical field [0001] This specification generally relates to the design and use of resistive particulate matter (PM) sensors in exhaust gas streams. Background technique [0002] Diesel combustion exhaust is a regulated emission. Diesel particulate matter (PM) is the particulate constituent of diesel exhaust, including diesel soot and aerosols such as ash particles, metal wear particles, sulfates and silicates. When released into the atmosphere, PM can take the form of individual particles or chain aggregates, most of which are in the invisible submicron range of 100 nanometers. Various techniques have been developed for identifying and filtering exhaust PM before it is released to the atmosphere. [0003] For 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 loading on the filter and to diagnose ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N3/023
CPCF01N3/023F01N9/00F01N9/002F01N2560/05F01N3/021F01N11/00F01N13/008F01N2550/04G01M15/102G01N15/0606G01N15/0656G01N2015/0046Y02T10/12Y02T10/40
Inventor 张小钢
Owner FORD GLOBAL TECH LLC