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Techniques for controlling scr aftertreatment systems

An SCR catalyst and controller technology, which is applied in the electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, and exhaust gas treatment, etc., can solve the problems of reducing effectiveness and reliable estimation of the amount of ammonia escaping.

Active Publication Date: 2019-09-03
CUMMINS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NOx sensors that are sensitive to ammonia crossover hinder the ability to provide a reliable estimate of the amount of ammonia slip, thereby reducing the effectiveness of feedback SCR control in delivering the optimal amount of ammonia to the exhaust system and potentially creating SCR errors Indication and / or Reductant Injector Fault Condition

Method used

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  • Techniques for controlling scr aftertreatment systems
  • Techniques for controlling scr aftertreatment systems
  • Techniques for controlling scr aftertreatment systems

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Embodiment Construction

[0011] For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings, and specific language will be used to describe the same. It will be understood, however, that no limitation of the scope of the invention is thereby intended, and that any changes and further modifications to the illustrated embodiments are contemplated herein and as would normally occur to one skilled in the art to which the invention pertains, such as Any further application of the principles of the invention illustrated in the examples.

[0012] refer to figure 1 , the internal combustion engine system 10 includes an exhaust gas stream 12 produced by operating an internal combustion engine 14, the exhaust gas stream 12 comprising NO x amount. Engine 14 includes a number of cylinders 32 that receive a supply of fuel from a fuel source 34 via injectors 36 , at figure 1 Only one of these injectors is shown in . ...

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Abstract

Selective catalytic reduction (SCR) catalysts are provided in the exhaust system of internal combustion engines. A reductant injector is coupled to the exhaust flow at a location upstream of the SCR catalyst, and first and second NOx sensors provide NOx measurements upstream and downstream of the SCR catalyst, respectively. A system and method are disclosed for operating the system to determine the amount of NOx and / or NH3 slip downstream of the SCR catalyst by decoupling the NOx-NH3 measurement from the output of a second NOx sensor Control of the amount of reductant injection is thereby provided.

Description

[0001] This application claims priority to US Patent Application Serial No. 14 / 179,887, filed February 13, 2014, which is incorporated herein by reference in its entirety. Background technique [0002] The technical field of the disclosure relates generally to the control of selective catalytic reduction (SCR) aftertreatment systems for internal combustion engines. [0003] SCR systems present several control challenges for internal combustion engine applications, including for mobile applications. An SCR system includes a reducing catalyst and a reducing agent, such as urea or ammonia. The injector provides reductant to the exhaust flow at a location upstream of the reduction catalyst, and the reductant enters the gas phase of the exhaust flow as ammonia. There is sometimes a delay between the introduction of the reductant and the availability of the reductant product, e.g. sprayed particles of reductant may need to be evaporated into the exhaust gas stream, hydrolyzed from ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCB01D53/9418B01D53/9495B01D2251/2062F01N3/106F01N3/208F01N11/00F01N2560/026F01N2560/14F01N2610/02F01N2610/146Y02T10/12Y02T10/40
Inventor 谢明峰M.哈斯P.V.加里梅拉
Owner CUMMINS INC