Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for calibrating estimates of nh3 stored in selective catalytic reduction systems

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: 2016-03-02
FORD GLOBAL TECH LLC
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for calibrating estimates of nh3 stored in selective catalytic reduction systems
  • Method for calibrating estimates of nh3 stored in selective catalytic reduction systems
  • Method for calibrating estimates of nh3 stored in selective catalytic reduction systems

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention describes a method of correcting the estimate of NH3 stored in a selective catalytic reduction system (SCR). In one example, the efficiency of the SCR is determined from the NOx sensor output, and the estimated amount of NH3 is corrected based on the efficiency of the SCR. Engine emissions may be reduced by improving estimated NH3 storage levels, at least during certain operating 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 gas may be processed by a selective catalytic reduction system (SCR, selective reduction catalyst) 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. adj...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/208F01N2560/026F01N2560/14F01N2610/02F01N2900/0414F01N2900/0418F01N2900/1402F01N2900/1616F01N2900/1622F01N13/009Y02T10/12
Inventor D·尤帕海雅M·J·范尼马斯塔特
Owner FORD GLOBAL TECH LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com