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

Method of controlling nox purification system and NOx purification system

A purification system and control method technology, applied in chemical instruments and methods, electrical control, separation methods, etc., can solve problems such as difficult product use, high price of NOx concentration sensors, etc., and achieve the effect of preventing deterioration and avoiding regeneration control of sulfur poisoning

Inactive Publication Date: 2009-04-08
ISUZU MOTORS LTD
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this NOx concentration sensor is currently expensive, there is a problem that it is difficult to use in mass-produced products

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 of controlling nox purification system and NOx purification system
  • Method of controlling nox purification system and NOx purification system
  • Method of controlling nox purification system and NOx purification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Hereinafter, a NOx purification method and a NOx purification system according to embodiments of the present invention will be described with reference to the drawings. The regeneration control mentioned here includes NOx regeneration control for recovering the NOx storage capacity of the NOx storage substance and desulfurization regeneration control for cleaning sulfur from the catalyst against sulfur poisoning of the catalyst caused by sulfur components in the fuel. In addition, the excess state of the exhaust gas referred to herein refers to the amount of air and fuel supplied to the exhaust gas flowing into the NOx occlusion reduction catalyst (also included in the cylinder) without excessive combustion in the cylinder. The ratio of the combustion part) is close to the state of the theoretical air-fuel ratio or the excess state in which the amount of fuel is more than the theoretical air-fuel ratio.

[0035] FIG. 1 shows the configuration of a NOx purification syste...

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 provides a method of controlling NOx purification system (1) including NOx occlusion reduction catalyst (22) and control unit (30) capable of NOx regeneration control and sulfur poisoning regeneration control, wherein the level of deterioration of NOx occlusion reduction catalyst (22) by sulfur poisoning is estimated on the basis of the amount of oxygen adsorbed and occludedon the NOx occlusion reduction catalyst (22) immediately after a termination of rich air fuel ratio condition of NOx regeneration control. Accordingly, excess sulfur poisoning regeneration can be avoided through estimating with high accuracy of the level of sulfur poisoning on the NOx occlusion reduction catalyst (22) and performing of sulfur poisoning regeneration at appropriate frequency, thereby preventing deterioration of mileage.

Description

technical field [0001] The present invention relates to a control method of a NOx purification system including a NOx storage reduction catalyst for purifying NOx (nitrogen oxides) in exhaust gas from an internal combustion engine, and a NOx purification system. Background technique [0002] Emission regulations on PM (particulate matter), NOx, CO, HC, etc., emitted from diesel engines have been strengthened year by year. As such restrictions are strengthened, it becomes increasingly difficult to cope with the limit values ​​only by improving the engine. Therefore, a technique of installing an exhaust gas after-treatment device in the exhaust passage of the engine to reduce these substances discharged from the engine has been adopted. [0003] In response to such a situation, various studies and proposals have been made on NOx catalysts for reducing and removing NOx (nitrogen oxides) from exhaust gases of internal combustion engines such as diesel engines and some gasoline ...

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): B01D53/94F01N3/08F01N3/24F01N3/28F02D41/04
CPCF01N3/0842B01D53/9431F02D2200/0814F01N3/0885F02D41/028F01N2550/03F02D2200/0818B01D53/9495
Inventor 我部正志长冈大治
Owner ISUZU MOTORS LTD