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1. WO2020062865 - CONTROL METHOD AND SYSTEM FOR SCR DOWNSTREAM NOₓ CLOSED-LOOP PROCESS

Publication Number WO/2020/062865
Publication Date 02.04.2020
International Application No. PCT/CN2019/084926
International Filing Date 29.04.2019
IPC
F01N 3/20 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
10by thermal or catalytic conversion of noxious components of exhaust
18characterised by methods of operation; Control
20specially adapted for catalytic conversion
CPC
F01N 2610/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2610Adding substances to exhaust gases
02the substance being ammonia or urea
F01N 2610/146
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2610Adding substances to exhaust gases
14Arrangements for the supply of substances, e.g. conduits
1453Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
146Control thereof, e.g. control of injectors or injection valves
F01N 2900/0402
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2900Details of electrical control or of the monitoring of the exhaust gas treating apparatus
04Methods of control or diagnosing
0402using adaptive learning
F01N 2900/0408
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2900Details of electrical control or of the monitoring of the exhaust gas treating apparatus
04Methods of control or diagnosing
0408using a feed-back loop
F01N 2900/0412
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2900Details of electrical control or of the monitoring of the exhaust gas treating apparatus
04Methods of control or diagnosing
0412using pre-calibrated maps, tables or charts
F01N 3/208
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
10by thermal or catalytic conversion of noxious components of exhaust
18characterised by methods of operation; Control
20specially adapted for catalytic conversion
2066Selective catalytic reduction [SCR]
208Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
Applicants
  • 广西玉柴机器股份有限公司 GUANGXI YUCHAI MACHINERY GROUP CO., LTD. [CN]/[CN]
Inventors
  • 刘星 LIU, Xing
  • 林鹏慧 LIN, Penghui
  • 胡国强 HU, Guoqiang
  • 吴可 WU, Ke
Agents
  • 广州市越秀区海心联合专利代理事务所(普通合伙) GUANGZHOU HAIXIN UNION PATENT LAW OFFICE
Priority Data
201811155388.730.09.2018CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) CONTROL METHOD AND SYSTEM FOR SCR DOWNSTREAM NOₓ CLOSED-LOOP PROCESS
(FR) PROCÉDÉ ET SYSTÈME DE COMMANDE DE TRAITEMENT EN BOUCLE FERMÉE DES NOX EN AVAL D'UN SCR
(ZH) 一种SCR下游NOx闭环过程中的控制方法及系统
Abstract
(EN)
Disclosed is a control method for a SCR downstream NOₓ closed-loop process: one self-learning pulse table storing a target value-actual value offset, a target urea injection volume, and a correction factor is established, and the correction factor is obtained by querying the self-learning pulse table to control the final urea injection volume; comprising the following steps: S1, when an offset becomes greater than a preset first threshold for the first time, marking the offset as a target offset, and executing step S2; S2, obtaining a correction factor by performing PI closed-loop control; S3, when PI closed-loop control is in a stable state, storing the correction factor, the target offset, and the target urea injection volume into the self-learning pulse table; and S4,the next time when the offset becomes greater than the first threshold, if the offset is stored, then querying the self-learning pulse table to obtain the correction factor, and if not, marking the offset as a target offset, and executing step S2. Also disclosed is a control system for the SCR downstream NOₓ closed-loop process corresponding to the method.
(FR)
L'invention concerne un procédé de commande destiné à un traitement en boucle fermée des NOx en aval d'un SCR, dans lequel une table d'impulsions à auto-apprentissage, pouvant stocker un décalage valeur cible-valeur réelle, un volume cible d'injection d'urée et un facteur de correction, est établie, et le facteur de correction est obtenu par interrogation de la table d'impulsions à auto-apprentissage afin de réguler le volume final d'injection d'urée ; le procédé consistant : S1, lorsqu'un décalage devient supérieur à un premier seuil prédéfini pour la première fois, à marquer le décalage en tant que décalage cible, et à exécuter l'étape S2 ; S2, à obtenir un facteur de correction au moyen de l'exécution d'une régulation en boucle fermée PI ; S3, lorsque la régulation en boucle fermée PI est en état stable, à stocker le facteur de correction, le décalage cible et le volume cible d'injection d'urée dans la table d'impulsions à auto-apprentissage ; et S4, la fois suivante, lorsque le décalage devient supérieur au premier seuil, si le décalage est stocké, à interroger la table d'impulsions à auto-apprentissage afin d'obtenir le facteur de correction, et sinon, à marquer le décalage en tant que décalage cible, et à exécuter l'étape S2. L'invention concerne également un système de commande du traitement en boucle fermée des NOx en aval du SCR, correspondant au procédé.
(ZH)
本申请公开了一种SCR下游NOx闭环过程中的控制方法,建立一个保存有目标值-实际值的偏差、目标尿素喷射量及修正因子的自学习脉谱表,通过查询自学习脉谱表得到修正因子,以控制最终尿素喷射量;包括步骤如下:S1、当偏差首次大于预设的第一阈值时,将该偏差记为目标偏差,并执行步骤S2;S2、进行PI闭环控制得到修正因子;S3、PI闭环控制稳态时,将修正因子以及目标偏差、目标尿素喷射量存入自学习脉谱表中;S4、当下一次偏差大于第一阈值时,若该偏差已存,则查询自学习脉谱表得到修正因子,否则,将该偏差记为目标偏差,并执行步骤S2。本申请还公开了一种与所述方法对应的SCR下游NOx闭环过程中的控制系统。
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