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Method and system for reducing particulate emissions

A particulate filter and engine system technology, applied in the direction of electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc., can solve the problem that the temperature of particulate filters cannot reach a high enough temperature and reduce fuel consumption. Economy, increase filter temperature and other issues, achieve the effect of maintaining fuel economy, improving reliability, and maintaining PM emissions

Active Publication Date: 2021-02-23
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the inventors herein have recognized potential disadvantages of using the above approach
Oxygen flow to the filter during DFSO or other engine shutdown events can excessively increase filter temperature, leading to premature filter degradation
Additionally, employing strategies to limit DFSO duration to mitigate excessive exhaust particulate filter temperature increases and premature filter degradation can reduce fuel economy and can also reduce drivability
Furthermore, still during short periods of engine operation (eg, during short vehicle trips), the particulate filter temperature may not reach a high enough temperature for regeneration

Method used

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  • Method and system for reducing particulate emissions
  • Method and system for reducing particulate emissions
  • Method and system for reducing particulate emissions

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Embodiment Construction

[0014] The following description relates to systems and methods for reducing particulate emissions from an engine system including an exhaust reversing valve and an exhaust particulate filter. figure 1 A vehicle engine system including an exhaust particulate filter is shown in , which may be configured to operate on a fuel such as diesel or gasoline. The exhaust particulate filter may include a diesel particulate filter (DPF), a gasoline particulate filter (GPF), and the like to filter particulate matter (PM) in engine exhaust. Exhaust particulate filters trap PM during vehicle driving such as figure 2 shown in the graph in. Such as Figure 3 to Figure 4 As shown in , exhaust gas may be directed via an exhaust reversing valve in the main exhaust passage to an exhaust particulate filter disposed in the bypass exhaust passage. Figure 5 A method for operating an engine system including an exhaust reversing valve for directing exhaust gas to an exhaust particulate filter is s...

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Abstract

The present invention relates to methods and systems for reducing particulate emissions. Methods and systems are provided for filtering particulate matter in an exhaust passage of an engine system. In one example, a method may include directing engine exhaust to an exhaust particulate filter during cold start conditions including an engine temperature less than a threshold engine temperature, and directing engine exhaust to bypass exhaust particulates during warm engine conditions The filter, wherein the warm engine condition includes an engine temperature greater than or equal to a threshold engine temperature, and fuel burning in the engine. In this way, the exhaust particulate filter may be reliably regenerated during engine shutdown events such as DFSO while reducing filter degradation and lowering PM emissions.

Description

technical field [0001] The present invention generally relates to the design and use of engine exhaust systems for reducing particulate emissions from combustion engines. Background technique [0002] Engine combustion using diesel or gasoline fuel can produce particulate matter (PM) such as soot and aerosols that can be emitted into the atmosphere. For emissions compliance, particulate filters such as Diesel Particulate Filters (DPF) and Gasoline Particulate Filters (GPF) are included inline in the engine exhaust stream to filter out exhaust gases before they are released PM. A particulate filter clogged with PM may be regenerated in situ during a deceleration fuel cut off (DFSO) event by supplying excess oxygen to the filter and increasing filter temperature to oxidize PM. One example approach shown by Bidner et al. in US 8,424,295 discloses adding excess oxygen to the particulate filter during engine shutdown conditions and regenerating the particulate filter during at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/027F01N3/032F01N9/00F01N13/00F01N13/08F01N11/00
CPCF01N13/009F01N3/027F01N3/032F01N9/002F01N11/00F01N13/08F01N2900/1602F01N2900/08F02D2200/0802F01N13/14F01N3/0238F01N2410/04Y02T10/40F01N3/023
Inventor J·N·尤瑞P·M·莱恩M·J·于里克
Owner FORD GLOBAL TECH LLC
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