Self-diagnosing method for diagnosing a scr system
US-2015113953-A1 · Apr 30, 2015 · US
System and method to calculate concentration of diesel exhaust fluid (def)
US2016108786A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016108786-A1 |
| Application number | US-201514979810-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 28, 2015 |
| Priority date | Dec 28, 2015 |
| Publication date | Apr 21, 2016 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
A system to calculate concentration of diesel exhaust fluid (DEF) in an exhaust of an engine is disclosed. The system includes a selective catalytic reduction (SCR) module, a diesel exhaust fluid (DEF) module, a first NOx sensor, a second NOx sensor, and a control module. The SCR module is adapted to receive exhaust gas. The diesel exhaust fluid (DEF) module introduces the diesel exhaust fluid (DEF) into the exhaust and is upstream of the SCR module. The first NOx sensor is in fluid communication with exhaust to detect a first NOx value of the exhaust gas at a location upstream of the SCR module. The second NOx sensor is in fluid communication with exhaust to detect a second NOx value of the exhaust gas at a location downstream of the SCR module. The control module is in communication with the first NOx sensor, the SCR module, and the second NOx sensor to calculate a numeric value of the concentration of the diesel exhaust fluid (DEF) based on a conversion ratio. The conversion ratio is calculated according to a NOx differential between the first NOx sensor and the second NOx sensor relative to a predicted NOx differential for a given amount of DEF injected.
First claim
Opening claim text (preview).
What is claimed is: 1 . A system to calculate concentration of diesel exhaust fluid (DEF) in an exhaust of an engine, the system comprising: a selective catalytic reduction (SCR) module adapted to receive exhaust gas; a diesel exhaust fluid (DEF) module for introducing the diesel exhaust fluid (DEF) into the exhaust, upstream of the SCR module; a first NOx sensor in fluid communication with exhaust to detect a first NOx value of the exhaust gas at a location upstream of the SCR module; a second NOx sensor in fluid communication with exhaust to detect a second NOx value of the exhaust gas at a location downstream of the SCR module; and a control module in communication with the first NOx sensor, the SCR module, and the second NOx sensor, the control module calculates a numeric value of the concentration of the diesel exhaust fluid (DEF) based on a conversion ratio; wherein the conversion ratio is calculated according to a NOx differential between the first NOx sensor and the second NOx sensor relative to a predicted NOx differential for a given amount of DEF injected.
Assignees
Inventors
Classifications
- F01N3/208Primary
Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title
Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title
Monitoring or diagnostic devices for exhaust-gas treatment apparatus · CPC title
using a state observer · CPC title
Exhaust gas composition · CPC title
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- What does patent US2016108786A1 cover?
- A system to calculate concentration of diesel exhaust fluid (DEF) in an exhaust of an engine is disclosed. The system includes a selective catalytic reduction (SCR) module, a diesel exhaust fluid (DEF) module, a first NOx sensor, a second NOx sensor, and a control module. The SCR module is adapted to receive exhaust gas. The diesel exhaust fluid (DEF) module introduces the diesel exhaust fluid …
- Who is the assignee on this patent?
- Caterpillar Inc
- What technology area does this patent fall under?
- Primary CPC classification F01N3/208. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Apr 21 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).