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

SCR fault diagnosis method and device

A fault diagnosis and detection technology, which is applied in the diagnosis device of exhaust treatment device, electronic control of exhaust treatment device, complex mathematical operation, etc., can solve the problems of easy false alarm and no alarm, etc. Diagnosis accuracy and accuracy, and the effect of improving user experience

Pending Publication Date: 2021-12-10
WEICHAI POWER CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This SCR fault diagnosis method is easy to report false alarms (the SCR is a good part but the SCR fault is reported), or the alarm is not reported when the SCR is actually faulty.

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
  • SCR fault diagnosis method and device
  • SCR fault diagnosis method and device
  • SCR fault diagnosis method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0046] Diesel engines will produce harmful nitrogen oxides (NO X ), in order to meet the statutory emission requirements of diesel engines, most of the aftertreatment systems of existing diesel engines are equipped with selective catalytic reduction units (Selective Catalystic Reduction, SCR). The selective catalytic reduction unit reduces nitrogen oxides into harmless nitrogen by spr...

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 provides an SCR fault diagnosis method and device. The method comprises the following steps: inputting a conversion efficiency calculation parameter of a to-be-detected SCR into an SCR conversion efficiency calculation function to obtain conversion efficiency values of the to-be-detected SCR corresponding to N information acquisition time windows; inputting the conversion efficiency value of the to-be-detected SCR into the probability density function of the SCR conversion efficiency to obtain a probability value that the to-be-detected SCR corresponding to each information acquisition window is a degraded part; inputting N probability values, corresponding to the N information acquisition time windows, of the to-be-detected SCR as the degraded part into a probability factor calculation function of the SCR as the degraded part to obtain a probability factor of the SCR as the degraded part; and when the probability factor that the SCR is the degraded part is greater than a preset probability factor, determining that the SCR has a fault. According to the method, the accuracy of SCR fault diagnosis can be improved.

Description

technical field [0001] The present application relates to the SCR fault diagnosis technology of a diesel engine, in particular to an SCR fault diagnosis method and device. Background technique [0002] Diesel engines will produce harmful nitrogen oxides (NO X ), in order to meet the statutory emission requirements of diesel engines, most of the aftertreatment systems of existing diesel engines are equipped with selective catalytic reduction units (Selective Catalystic Reduction, SCR). The selective catalytic reduction unit reduces nitrogen oxides into harmless nitrogen by spraying urea aqueous solution to a catalyst installed in the exhaust pipe of a diesel engine. [0003] According to regulations, the diesel engine controller (Engine control Unit, referred to as ECU) needs to control the NO of the diesel engine SCR. X The efficiency of converting to nitrogen gas (that is, whether the SCR is good or not) is diagnosed in real time, and it is stipulated that when NO is dete...

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
IPC IPC(8): G06F17/11G16C20/10F01N11/00
CPCG06F17/11G16C20/10F01N11/00Y02T10/40
Inventor 谭治学杨新达冯海浩张军张竞菲
Owner WEICHAI POWER CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com