Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for correcting nitrogen oxide emission models

A technology of nitrogen oxides and models, applied in exhaust treatment, exhaust equipment, mechanical equipment, etc., can solve problems such as errors, excessive injection, and aging of catalytic devices

Inactive Publication Date: 2011-04-20
PEZHO SITROEN AUTOMOBILS SA
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, it is equally possible that the observed over- or under-injection is not due to aging of the catalyst, but rather an error in the mathematical model in the system that determines the amount of reductant injected

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 correcting nitrogen oxide emission models
  • Method for correcting nitrogen oxide emission models
  • Method for correcting nitrogen oxide emission models

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] FIG. 1 shows the functional structure of a module 1 used by a pilot strategy SCR (Strategie de pilotage SCR) in a motor vehicle. The structure described below takes into account the heat in the exhaust pipe in the case of using a reducing agent such as ammonia reducing agent, or rather using a urea solution stored in a reservoir or injected in the exhaust pipe, This urea solution is converted to ammonia which then reacts with NOx. However, the structures described are by no means limited to this particular case and are applicable to all other reducing agents.

[0028] In the description that follows, the terms "reducing agent" and "ammonia" are used generically, it being understood that all other reducing agents can be used with all methods and features described herein in all cases.

[0029] Such a strategy is usually employed by a special computer installed for this purpose in the motor vehicle, or by an already existing computer, such as the engine computer.

[003...

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 invention relates to a method for correcting a model for determining the amount of reducing agent to inject for the selective catalytic reduction of nitrogen oxides contained in exhaust gases, which includes the following steps: determining an amount of reducing agent to inject based on the amount of nitrogen oxides emitted and an initial mathematical model; determining, by taking a measurement from the catalyst of the amount and / or nature of the gas, whether or not the reducing reaction is carried out under correct conditions; if an anomaly is detected, adjusting the amount of reducing agent to inject; and if the use of said method leads to a number of repeated adjustments of the same nature greater than a predetermined value N: the mathematical model is corrected, and the initial mathematical model is replaced by the corrected model.

Description

technical field [0001] The present invention relates to the field of treatment of exhaust gases from motor vehicles, and more particularly to exhaust gas treatment systems using a reducing agent injected into the exhaust pipe of the vehicle. [0002] More specifically, the present invention relates to a method for use in a motor vehicle equipped with a system for treating nitrogen oxides emitted by a diesel engine by reducing the nitrogen oxides with a reducing agent such as ammonia by selective catalytic reduction. Background technique [0003] Such treatment systems allow the exhaust gas to be treated in order to comply with increasingly lower legal emission levels. [0004] The invention finds an advantageous, but not exclusive, application in motor vehicles equipped with treatment systems of this type in which reducing agent, such as ammonia, is stored, for example in the form of liquid urea, in an aqueous reservoir. [0005] The reduction of nitrogen oxides by ammonia...

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 Applications(China)
IPC IPC(8): F01N3/20
CPCY02T10/24F01N3/208F01N2900/08F01N2900/0402F01N2560/026F01N2900/1621Y02T10/12Y02A50/20
Inventor C·沙里亚尔
Owner PEZHO SITROEN AUTOMOBILS SA