{"title":"Model-Based NH3 Slip Detection for SCR + ASC System Control and OBD","authors":"Wan Chuan, Lou Diming, Wang Tiantian","doi":"10.1007/s12239-024-00125-4","DOIUrl":null,"url":null,"abstract":"<p>Since accuracy and adaptation of the closed-loop control in selective catalytic reduction (SCR) and ammonia slip catalytic (ASC) systems quite depend on the detection of ammonia (NH<sub>3</sub>), the identification of NH<sub>3</sub> slip is important in the above systems. A model-based NH<sub>3</sub> slip detection method by a brief dosing-off maneuver is proposed, which is utilizing NO<sub>x</sub> sensors’ cross-sensitivity between NH<sub>3</sub> and NO<sub>x</sub>. When the operating conditions are suitable, NH<sub>3</sub> slip detection function would trigger once the deviation of the DeNO<sub>x</sub> efficiency calculated by model and by sensor is over a limit. The NH<sub>3</sub> slip could be detected when the consumption of NH<sub>3</sub> storage exceeded a limit earlier than DeNO<sub>x</sub> efficiency below a limit. Validation test results showed this NH<sub>3</sub> slip detection function can effectively detect the NH<sub>3</sub> slip of SCR + ASC system, and immediately send out a NO<sub>x</sub> slip result if the tailpipe NO<sub>x</sub> emission exceeds the OBD limit.</p>","PeriodicalId":50338,"journal":{"name":"International Journal of Automotive Technology","volume":"213 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Automotive Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s12239-024-00125-4","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Since accuracy and adaptation of the closed-loop control in selective catalytic reduction (SCR) and ammonia slip catalytic (ASC) systems quite depend on the detection of ammonia (NH3), the identification of NH3 slip is important in the above systems. A model-based NH3 slip detection method by a brief dosing-off maneuver is proposed, which is utilizing NOx sensors’ cross-sensitivity between NH3 and NOx. When the operating conditions are suitable, NH3 slip detection function would trigger once the deviation of the DeNOx efficiency calculated by model and by sensor is over a limit. The NH3 slip could be detected when the consumption of NH3 storage exceeded a limit earlier than DeNOx efficiency below a limit. Validation test results showed this NH3 slip detection function can effectively detect the NH3 slip of SCR + ASC system, and immediately send out a NOx slip result if the tailpipe NOx emission exceeds the OBD limit.
期刊介绍：
The International Journal of Automotive Technology has as its objective the publication and dissemination of original research in all fields of AUTOMOTIVE TECHNOLOGY, SCIENCE and ENGINEERING. It fosters thus the exchange of ideas among researchers in different parts of the world and also among researchers who emphasize different aspects of the foundations and applications of the field.
Standing as it does at the cross-roads of Physics, Chemistry, Mechanics, Engineering Design and Materials Sciences, AUTOMOTIVE TECHNOLOGY is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from thermal engineering, flow analysis, structural analysis, modal analysis, control, vehicular electronics, mechatronis, electro-mechanical engineering, optimum design methods, ITS, and recycling. Interest extends from the basic science to technology applications with analytical, experimental and numerical studies.
The emphasis is placed on contributions that appear to be of permanent interest to research workers and engineers in the field. If furthering knowledge in the area of principal concern of the Journal, papers of primary interest to the innovative disciplines of AUTOMOTIVE TECHNOLOGY, SCIENCE and ENGINEERING may be published. Papers that are merely illustrations of established principles and procedures, even though possibly containing new numerical or experimental data, will generally not be published.
When outstanding advances are made in existing areas or when new areas have been developed to a definitive stage, special review articles will be considered by the editors.
No length limitations for contributions are set, but only concisely written papers are published. Brief articles are considered on the basis of technical merit.
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