Exhaust after treatment device mode regulation

a treatment device and exhaust mode technology, applied in the direction of exhaust treatment, electrical control, mechanical equipment, etc., can solve the problems of increasing the back pressure of the exhaust, oxidising the carbon based soot and burning it off, and heating the air intake requires additional fuel, so as to achieve the effect of regulating more precisely and efficiently

Inactive Publication Date: 2014-05-15
PERKINS ENGINES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In accordance with a second aspect there is provided an exhaust treatment system for an engine system comprising: an exhaust after treatment device, EATD, having a plurality of modes; one or more valves configured to adjust a gas pressure difference of the engine system between a first location and a second location; a controller in communication with the one or more valves and configured to identify a target EATD thermal management mode out of the plurality of temperature dependent thermal management modes, and control the temperature dependent EATD thermal management mode of the EATD by regulating the gas pressure difference using the one or more valves. Therefore, the EATD mode may be regulated more precisely and efficiently.

Problems solved by technology

However, after prolonged use, the DPF may become clogged or ineffective, leading again to higher exhaust emissions or an increase in exhaust back pressure.
Raising the temperature further may oxidise the carbon based soot and burn it off.
However, heating the air intake requires additional fuel and decreases efficiency.
Furthermore, this does not provide very much control over the exhaust gas temperature or DPF regeneration.

Method used

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Examples

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Embodiment Construction

[0017]Exhaust after treatment devices (EATD) may have several modes of operation including warm-up modes, normal operation modes and regeneration modes. Various parameters may be used to determine when and how to change an EATD mode. For example, a soot sensor may detect when too much soot has built up on a diesel particulate filter (DPF), which is one type of EATD. A differential pressure sensor across the DPF may also be used to determine if the DPF has become clogged and requires regeneration. Regeneration of an EATD may occur during periods of high engine load, which consequently result in elevated exhaust temperatures. However, should the EATD require regeneration during extended idle periods or when the engine is not under load, as detected by monitoring engine speed and fuel delivery, for example, then this information may be used to arrive at a decision whether or not to assist in the regeneration process and so change the EATD mode from normal operation mode to one of perha...

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Abstract

Method and system for controlling the temperature dependent mode of an exhaust after treatment device, EATD, within an engine system comprising: identifying a target EATD mode. Regulating an EATD temperature to within a temperature range corresponding with the target mode by controlling a gas pressure difference of the engine system between a first location and a second location.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a method and system for regulating exhaust after treatment device modes of operation.BACKGROUND[0002]Internal combustion engines and diesel engines in particular, produce a number of waste products emitted from their exhaust systems. These waste products include gases such as nitrogen oxides and carbon monoxide, solid particulate matter including soot as well as unburned or partially burned fuel in the form of hydrocarbons. In order to reduce exhaust emissions, exhaust after treatment devices (EATD) and systems may be employed. These may include diesel particulate filters (DPF) that remove portions of the exhaust emissions before leaving an engine system in to the atmosphere and selective catalytic reduction systems.[0003]A DPF may include several components for removing multiple different types of waste products. For example, the DPF may act as a physical filter for trapping soot particles, a catalyst may be utilised to absorb ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/10
CPCF01N3/10F02D41/0245F02D41/027F02D2200/0802F01N3/208F01N9/00F01N3/023Y02T10/12Y02T10/40F01N9/002
Inventor EAGER, ANTONY JAMESFARMAN, ALISTAIR CHARLES
Owner PERKINS ENGINES
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