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Method for correcting an estimate of nh3 stored within a selective catalyst reduction system

A storage and correction technology, applied in internal combustion piston engines, electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, etc., can solve problems such as inability to execute control behaviors, and reduce consumption and emissions Effect

Active Publication Date: 2012-09-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the NH stored in the SCR 3 When the estimated quantity deviates from its actual quantity by more than a threshold amount, the control action may not be executed

Method used

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  • Method for correcting an estimate of nh3 stored within a selective catalyst reduction system
  • Method for correcting an estimate of nh3 stored within a selective catalyst reduction system
  • Method for correcting an estimate of nh3 stored within a selective catalyst reduction system

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Embodiment Construction

[0024] The current description involves the supply of NH to SCR 3 . According to one aspect of the present invention, correction of NH in SCR by observer is described. 3 The estimated storage capacity of . figure 1 An example engine system with an SCR for reducing NOx is shown. figure 2 An example block diagram of an SCR-based NOx reduction system is shown. Figure 3A and 3B Shown is the NH inside the SCR that has the detector used to correct the 3 The relative expected signal of the system for estimating storage capacity. Figure 4-6 Shown are the NH that can be used alone or in combination to correct for storage within the SCR 3 A flowchart of the method for estimating storage capacity. Figure 7 shows the NH used to adjust the supply to the SCR 3 Block diagram of the volume controller.

[0025] refer to figure 1 , including multiple cylinders ( figure 1 An internal combustion engine 10 of which one cylinder is shown in ) is controlled by an electronic engine cont...

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Abstract

A method for correcting an estimated amount of NH3 store within a SCR is described. In one example, SCR efficiency is determined from a NOx sensor output and the estimated amount of NH3 is corrected based on the SCR efficiency. Engine emissions may be reduced via improving the estimated NH3 storage level, at least during some conditions.

Description

【Technical field】 [0001] The present invention relates to the correction of NH stored in a selective catalytic reduction system 3 method of estimating 【Background technique】 [0002] Nitrogen oxides (such as NOx) contained in engine exhaust may be processed by a selective reduction catalyst (SCR) system in a vehicle exhaust system to form N2 and H2O. SCR is compatible with reducing agents such as ammonia (NH 3 )) cooperate to reduce NOx. However, if an insufficient amount of NH is present in the SCR 3 , the amount of NOx passing through the SCR is higher than expected. On the other hand, if excess NH 3 Guide to SCR, NH 3 Will slip through the SCR. Difficult to sense NH stored in SCR due to the large surface area of ​​SCR 3 quantity. Therefore, it is desirable to estimate the NH in the SCR 3 storage capacity. Once the NH stored in the SCR is estimated 3 amount, can be based on the NH stored in the SCR 3 control actions (e.g. adjusting the NH injection into the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCY02T10/24F01N2560/14F01N2900/0418F01N13/02F01N2900/1616F01N2900/1402F01N2900/0414F01N2560/026F01N3/208F01N2900/1622F01N2610/02F01N13/009Y02T10/12
Inventor D·尤帕海雅M·J·范尼马斯塔特
Owner FORD GLOBAL TECH LLC
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