A method and system for diagnosing abnormal efficiency of an SCR

By classifying application scenarios based on post-processing reaction mechanisms and using windowed efficiency calculations, the problem of inaccurate diagnosis of SCR efficiency anomalies in existing technologies has been solved, enabling early warning and accurate maintenance, and reducing economic losses and claims risks.

CN122359153APending Publication Date: 2026-07-10HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610350081.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-20
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies cannot accurately predict SCR efficiency anomalies, preventing timely repairs when SCR efficiency is low, increasing economic losses and claims risks, and failing to effectively distinguish SCR efficiency differences under different operating conditions.

Method used

By classifying application scenarios based on post-treatment reaction mechanisms, combining exhaust heat and NOx emission coefficients, SCR efficiency limits are defined, and diagnostics are performed through windowed efficiency calculations and statistical distributions to achieve accurate early warning of SCR efficiency.

Benefits of technology

It enables accurate diagnosis of SCR efficiency anomalies, provides early warnings and the time of failure occurrence, reduces economic losses and claims risks associated with pre-torque limit repairs, and improves vehicle availability and freight efficiency.

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Abstract

The present application belongs to the diesel engine technical field, disclose a kind of SCR efficiency abnormal diagnosis method, the present application is according to SCR temperature, ammonia storage, original machine NOx and exhaust flow to confirm application scene, for the vehicle under same application scene, by SCR efficiency and original machine NOx mass flow to divide working condition area, to accurately judge the SCR efficiency under different scene different working condition.Limit: according to the SCR efficiency distribution value under different scene different working condition, select 20%~80% average value accurately diagnose SCR efficiency, and according to the difference of SCR efficiency and fault report limit value accurately predict fault report time, early warning fault, advance maintenance to avoid claim risk.
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