Method and system for exhaust particulate matter sensing

A particulate matter and particulate technology, which is applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc., can solve the problem of affecting the sensitivity of PM sensors, data output and diagnosis delays, and prolonging processing time etc. to achieve the effect of reducing the need for a large number of algorithms, accurate diagnosis, and extending the life of exhaust components

Active Publication Date: 2020-03-13
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PM sensor described by Roth et al. would continue to have the problem of large particles saturating the PM sensor current and thereby affecting the PM sensor sensitivity
Furthermore, the sensor output of Roth et al. requires the analysis of extensive algorithms to get a meaningful analysis 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

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Embodiment Construction

[0017] 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 . as in Figure 2A An individual electrode pair of the PM sensor shown in may include a pair of interdigitated electrodes electrically coupled to a voltage source to generate a current based on particles accumulated between the electrodes. Multiple electrode pairs of the PM sensor (in Figure 2B shown in ) can be connected to multiple voltage sources to measure the current across each of the electrodes independently and summed together to produce the total current of the PM sensor ( Figure 2C ). The controller can be configured to execute control programs such as image 3 procedure) to differentiate particle size based on the total current of the PM sensor and to regenerate the PM sensor. Additionally, the controller can intermittently clean the PM sensor (as in Figure 4 shown in the method presented at ), to ena...

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Abstract

Methods and systems are provided sensing particulate matter by a particulate matter (PM) sensor positioned downstream of a diesel particulate filter (DPF) in an exhaust system, where the PM sensor may include plurality of individual electrode pairs coupled to plurality of voltage sources and further to plurality of measurement devices. In one example, a method may include determining a total PM sensor current by summing current generated across the plurality of electrode pairs by determining the sum total of the current generated across the individual electrode pairs. In this way, the PM sensor may detect PMs in the exhaust more accurately, and not be affected by large particulates depositing on the electrodes.

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 component 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 be in 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 to identify and filter out exhaust PM before it is released into the atmosphere. [0003] As an example, PM sensors (also known as 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 PM loading on the filter and diagnose DPF ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N2900/1606F01N2550/04F01N2560/05F01N2900/0422F02D41/1466F02D41/1494F02D41/1496F02D41/22G01N15/0606G01N15/0656G01N2015/0046Y02T10/40G01M15/102G01N15/065
Inventor 张小钢
Owner FORD GLOBAL TECH LLC
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