CN106837480B - 一种基于模型的尿素喷射量控制方法及后处理控制*** - Google Patents

一种基于模型的尿素喷射量控制方法及后处理控制*** Download PDF

Info

Publication number
CN106837480B
CN106837480B CN201611220483.1A CN201611220483A CN106837480B CN 106837480 B CN106837480 B CN 106837480B CN 201611220483 A CN201611220483 A CN 201611220483A CN 106837480 B CN106837480 B CN 106837480B
Authority
CN
China
Prior art keywords
model
scrf
ammonia
stored value
concentration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201611220483.1A
Other languages
English (en)
Other versions
CN106837480A (zh
Inventor
张军
张振涛
王晓华
曹庆和
张瑜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
Original Assignee
Weichai Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN201611220483.1A priority Critical patent/CN106837480B/zh
Publication of CN106837480A publication Critical patent/CN106837480A/zh
Application granted granted Critical
Publication of CN106837480B publication Critical patent/CN106837480B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0411—Methods of control or diagnosing using a feed-forward control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

本发明涉及一种基于模型的尿素喷射量控制方法，所述方法包括如下步骤：S1：根据实际尿素喷射量，基于SCRF模型计算SCRF内的第一氨储值；S2：基于SCR模型计算SCR内的第二氨储值；S3：将S1步骤和S2步骤获得的第一氨储值和第二氨储值进行加权处理获得实际氨储值；S4：将S3步骤获得实际氨储值与氨储设定值做差，并经过PID控制器，得到闭环修正的氨氮比；S5：将S4步骤获得的闭环修正的氨氮比与前馈氨氮比做和，最终转化为需求的尿素喷射量。本发明采用基于模型闭环控制策略，能实现对尿素喷射的精确控制，不但能满足发动机排放要求，而且能减少标定工作及解决结晶问题。

Description

一种基于模型的尿素喷射量控制方法及后处理控制***
技术领域
本发明涉及发动机领域，特别涉及气体排放净化领域。
背景技术
随着汽车排放法规的日趋严格，带SCR(Selective Catalyst Reduction,选择性催化还原反应)的后处理***成为降低排放污染的主流技术。带SCR的后处理***降低排放污染的方法是通过向SCR箱中喷射尿素，达到降低氮氧化物的目的，从而降低排放，满足排放法规的要求。
在SCR的基础上，进一步发展了SCRF技术，SCRF指将SCR催化剂涂覆在DPF(颗粒物捕集器)上，又称SCR on Filter、SDPF等。采用SCRF技术，不但能够减低后处理体积，而且起燃特性更优，能够提高SCR转化效率。SCRF技术同样面临尿素喷射量精确控制的需求。
现有技术中，控制尿素喷射量的方法是采用SCR和DPF分开控制标定，这种情况下，SCR中NH3与DPF被动再生存在公用并竞争消耗NO2的情况。因此现有技术在SCRF***中适应性差，标定精度难以满足需求。
发明内容
本发明提出采用基于模型闭环控制策略，能实现对尿素喷射的精确控制，不但能满足发动机排放要求，而且能减少标定工作及解决结晶问题。
本发明的目的之一是通过以下技术方案实现的。
一种基于模型的尿素喷射量控制方法，所述方法包括如下步骤：
S1：将实际尿素喷射量输入SCRF模型，并基于SCRF模型计算SCRF内的第一氨储值；
S2：基于SCR模型计算SCR内的第二氨储值；
S3：将S1步骤和S2步骤获得的第一氨储值和第二氨储值进行加权处理获得实际氨储值；
S4：将S3步骤获得实际氨储值与氨储设定值做差，并经过PID控制器，得到闭环修正的氨氮比；
S5：将S4步骤获得的闭环修正的氨氮比与前馈氨氮比做和，最终转化为需求的尿素喷射量。
进一步，S1步骤中，所述SCRF模型的输入还包括NH3浓度，O2浓度，NO浓度，NO2浓度，SCRF前温度，排气流量以及碳原排量；所述SCRF模型具体为将SCRF径向划分为多个单元模块，在每个单元模块内根据能量守恒方程和质量守恒方程分别计算碳载量、氨储、NO、NO2和NH3；对每个单元的氨储相加得到第一氨储值。
进一步，S2步骤中，所述SCR模型的输入包括NH3浓度，O2浓度，NO浓度，NO2浓度和SCR前气体温度；所述SCR模型具体为将SCR径向均分为多个单元模块，对每个单元模块应用能量守恒方程和质量守恒方程，从而计算出每个单元模块的氨储、NO、NO2、NH3和温度，对每个单元模块的氨储相加得到第二氨储值。
进一步，S3步骤中，根据转速和喷油量查MAP获得加权系数进行所述加权处理。
进一步，所述加权处理获得实际氨储值为：首先将第一氨储值与加权系数做积，获得加权后的第一氨储值；然后，用数值2与加权系数做差，将差值与第二氨储值做积，获得加权后的第二氨储值；最后，将加权后的第一氨储值与加权后的第二氨储值做和，得到实际氨储值。
进一步，通过标定DOC的NO2转化效率(例如根据转速和喷油量来进行标定)，获得NO2所占比例MAP，然后通过转速和喷油量查所述MAP获得NO2所占比例，将发动机原排中NOx浓度与所述NO2所占比例做积获得输入所述SCRF模型的NO2浓度，再将原排中NOx浓度与NO2浓度做差获得输入所述SCRF模型的NO浓度。
进一步，根据温度传感器得到SCRF前温度；根据实际尿素喷射量(例如将其除以5.429)得到SCRF前NH3的浓度；根据进气量和喷油量得到排气流量；O2浓度由NOx传感器测量得到。
进一步，将SCRF内NH3吸附和NH3脱附的化学反应速率设置为可标定变量，该变量通过总结试验数据进行标定。
进一步，所述S4步骤中的所述氨储设定值以及S5步骤中的所述前馈氨氮比，均为根据SCRF温度和空速，通过查询事先标定的相应的MAP进行确定。
本发明的另一个目的提供一种发动机后处理控制***，可通过如下技术方案实现。
一种发动机后处理控制***，所述后处理控制***包括依次布置的DOC***、SCRF***、SCR***和ASC***，所述DOC***前布置有上游NOx传感器和DOC上游温度传感器，在DOC***和SCRF***之间布置有尿素喷嘴和SCRF上游温度传感器；在SCRF***和SCR***之间布置有SCR上游温度传感器，以及在ASC后还布置有下游NOx传感器和SCR下游温度传感器，所述后处理控制***采用上述基于模型的尿素喷射量控制方法对尿素喷射量进行控制。
本发明的优点在于：
本发明基于SCRF硬件***，提炼出基于双氨储的闭环控制策略，实现对尿素喷射的精确控制，不但能保证排放满足需求，而且基于模型的控制适应性强，标定简单，只需离线标定即可，通用性强，有利于产品化。
附图说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本发明的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1示出了根据本发明实施方式的发动机后处理控制***部件布置图。
图2示出了基于模型的尿素喷射量控制方法尿素喷射控制逻辑图。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施方式。虽然附图中显示了本公开的示例性实施方式，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施方式所限制。相反，提供这些实施方式是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
根据本发明的实施方式，提出一种基于模型的尿素喷射量控制方法和发动机后处理控制***，参考图1，所述后处理控制***包括依次布置的DOC***、SCRF***、SCR***和ASC***，所述DOC***前布置有上游NOx传感器和DOC上游温度传感器，在DOC***和SCRF***之间布置有尿素喷嘴和SCRF上游温度传感器；在SCRF***和SCR***之间布置有SCR上游温度传感器，以及在ASC后还布置有下游NOx传感器和SCR下游温度传感器。
参考图2，基于上述布置方式，本发明的实施方式实现一种基于模型的尿素喷射量控制方法，所述方法包括如下步骤：
S1：将实际尿素喷射量输入SCRF模型，并基于SCRF模型计算SCRF内的第一氨储值θ1；
S2：基于SCR模型计算SCR内的第二氨储值θ2；
S3：将S1步骤和S2步骤获得的第一氨储值θ1和第二氨储值θ2进行加权处理获得实际氨储值θ；
S4：将S3步骤获得实际氨储值与氨储设定值做差，并经过PID控制器，得到闭环修正的氨氮比；
S5：将S4步骤获得的闭环修正的氨氮比与前馈氨氮比做和，最终转化为需求的尿素喷射量。
在上述方法中：
对于S1步骤，所述SCRF模型的输入还包括NH3浓度，O2浓度，NO浓度，NO2浓度，SCRF前温度，排气流量以及碳原排量；所述SCRF模型具体为将SCRF径向划分为多个单元模块，在每个单元模块内根据能量守恒方程和质量守恒方程分别计算碳载量、氨储、NO、NO2和NH3；对每个单元的氨储相加得到第一氨储值。由于SCRF中，积碳的多少会对氨储产生一定的影响，因此需要将SCRF内NH3吸附和NH3脱附的化学反应速率设置为可标定变量，该变量需要通过总结试验数据进行标定。其中，通过标定DOC的NO2转化效率，获得NO2所占比例MAP，然后通过转速和喷油量查所述MAP获得NO2所占比例，将发动机原排中NOx浓度与所述NO2所占比例做积获得输入所述SCRF模型的NO2浓度，再将原排中NOx浓度与NO2浓度做差获得输入所述SCRF模型的NO浓度。据温度传感器得到SCRF前温度；根据实际尿素喷射量，将其除以数值5.429，得到SCRF前NH3的浓度；根据进气量和喷油量得到排气流量；O2浓度由NOx传感器测量得到。
对于S2步骤，所述SCR模型的输入包括NH3浓度，O2浓度，NO浓度，NO2浓度和SCR前气体温度；所述SCR模型具体为将SCR径向均分为多个单元模块，对每个单元模块应用能量守恒方程和质量守恒方程，从而计算出每个单元模块的氨储、NO、NO2、NH3和温度，对每个单元模块的氨储相加得到第二氨储值。
对于S3步骤，根据转速和喷油量查MAP获得加权系数进行所述加权处理。具体为：首先将第一氨储值与加权系数做积，获得加权后的第一氨储值；然后，用数值2与加权系数做差，将差值与第二氨储值做积，获得加权后的第二氨储值；最后，将加权后的第一氨储值与加权后的第二氨储值做和，得到实际氨储值。
对于所述S4步骤中的所述氨储设定值以及S5步骤中的所述前馈氨氮比，均为根据SCRF温度和空速，通过查询事先标定的相应的MAP进行确定。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (10)

1.一种基于模型的尿素喷射量控制方法，其特征在于，所述方法包括如下步骤：
S1：将实际尿素喷射量输入SCRF模型，并基于SCRF模型计算SCRF内的第一氨储值；
S2：基于SCR模型计算SCR内的第二氨储值；
S3：将S1步骤和S2步骤获得的第一氨储值和第二氨储值进行加权处理获得实际氨储值；
S4：将S3步骤获得实际氨储值与氨储设定值做差，并经过PID控制器，得到闭环修正的氨氮比；
S5：将S4步骤获得的闭环修正的氨氮比与前馈氨氮比做和，最终转化为需求的尿素喷射量。
2.如权利要求1所述的基于模型的尿素喷射量控制方法，其特征在于，S1步骤中，所述SCRF模型的输入还包括NH3浓度，O2浓度，NO浓度，NO2浓度，SCRF前温度，排气流量以及碳原排量；所述SCRF模型具体为将SCRF径向划分为多个单元模块，在每个单元模块内根据能量守恒方程和质量守恒方程分别计算碳载量、氨储、NO、NO2和NH3；对每个单元的氨储相加得到第一氨储值。
3.如权利要求1所述的基于模型的尿素喷射量控制方法，其特征在于，S2步骤中，所述SCR模型的输入包括NH3浓度，O2浓度，NO浓度，NO2浓度和SCR前气体温度；所述SCR模型具体为将SCR径向均分为多个单元模块，对每个单元模块应用能量守恒方程和质量守恒方程，从而计算出每个单元模块的氨储、NO、NO2、NH3和温度，对每个单元模块的氨储相加得到第二氨储值。
4.如权利要求1所述的基于模型的尿素喷射量控制方法，其特征在于，S3步骤中，根据转速和喷油量查MAP获得加权系数进行所述加权处理。
5.如权利要求4所述的基于模型的尿素喷射量控制方法，其特征在于，所述加权处理获得实际氨储值为：首先将第一氨储值与加权系数做积，获得加权后的第一氨储值；然后，用数值2与加权系数做差，将差值与第二氨储值做积，获得加权后的第二氨储值；最后，将加权后的第一氨储值与加权后的第二氨储值做和，得到实际氨储值。
6.如权利要求2所述的基于模型的尿素喷射量控制方法，其特征在于，通过标定DOC的NO2转化效率，获得NO2所占比例MAP，然后通过转速和喷油量查所述MAP获得NO2所占比例，将发动机原排中NOx浓度与所述NO2所占比例做积获得输入所述SCRF模型的NO2浓度，再将原排中NOx浓度与NO2浓度做差获得输入所述SCRF模型的NO浓度。
7.如权利要求2所述的基于模型的尿素喷射量控制方法，其特征在于，根据温度传感器得到SCRF前温度；根据实际尿素喷射量得到SCRF前NH3的浓度；根据进气量和喷油量得到排气流量；O2浓度由NOx传感器测量得到。
8.如权利要求2所述的基于模型的尿素喷射量控制方法，其特征在于，将SCRF内NH3吸附和NH3脱附的化学反应速率设置为可标定变量，该变量通过总结试验数据进行标定。
9.如权利要求1-8任意一项所述的基于模型的尿素喷射量控制方法，其特征在于，所述S4步骤中的所述氨储设定值以及S5步骤中的所述前馈氨氮比，均为根据SCRF温度和空速，通过查询事先标定的相应的MAP进行确定。
10.一种发动机后处理控制***，所述后处理控制***包括依次布置的DOC***、SCRF***、SCR***和ASC***，所述DOC***前布置有上游NOx传感器和DOC上游温度传感器，在DOC***和SCRF***之间布置有尿素喷嘴和SCRF上游温度传感器；在SCRF***和SCR***之间布置有SCR上游温度传感器，以及在ASC后还布置有下游NOx传感器和SCR下游温度传感器，所述后处理控制***采用如权利要求1-9任意一项所述的基于模型的尿素喷射量控制方法对尿素喷射量进行控制。
CN201611220483.1A 2016-12-26 2016-12-26 一种基于模型的尿素喷射量控制方法及后处理控制*** Active CN106837480B (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611220483.1A CN106837480B (zh) 2016-12-26 2016-12-26 一种基于模型的尿素喷射量控制方法及后处理控制***

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611220483.1A CN106837480B (zh) 2016-12-26 2016-12-26 一种基于模型的尿素喷射量控制方法及后处理控制***

Publications (2)

Publication Number Publication Date
CN106837480A CN106837480A (zh) 2017-06-13
CN106837480B true CN106837480B (zh) 2019-02-12

Family

ID=59136373

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611220483.1A Active CN106837480B (zh) 2016-12-26 2016-12-26 一种基于模型的尿素喷射量控制方法及后处理控制***

Country Status (1)

Country Link
CN (1) CN106837480B (zh)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102306206B1 (ko) * 2017-07-26 2021-09-30 로베르트 보쉬 게엠베하 엔진의 scr 요소 주입 시스템용 주입량 제어 방법 및 장치
DE102017222582A1 (de) * 2017-12-13 2019-06-13 Robert Bosch Gmbh Verfahren zur Korrektur eines modellierten Ammoniakmassenstroms und eines modellierten Stickoxidmassenstroms sowie zur Regelung eines SCR-Katalysatorsystems
CN108868976B (zh) * 2018-06-19 2021-01-26 北京航空航天大学 一种基于apso的双串联scr***尿素喷射规律云计算方法
CN108915827B (zh) * 2018-07-04 2020-02-11 中国汽车技术研究中心有限公司 基于SCR化学反应数学模型改善发动机NOx排放量的方法
CN108979802B (zh) * 2018-07-17 2020-07-03 山东艾泰克环保科技股份有限公司 一种无压力传感器的尿素泵泵压控制方法
CN110185523B (zh) * 2019-06-28 2020-09-29 潍柴动力股份有限公司 尿素喷射量控制方法及装置
CN112240235B (zh) * 2019-07-17 2021-10-19 上海汽车集团股份有限公司 一种scr的控制方法及装置
CN110905639B (zh) * 2019-11-29 2022-04-29 东风商用车有限公司 一种scr储氨模型的修正***及其方法
CN110761879B (zh) * 2019-12-27 2020-04-14 潍柴动力股份有限公司 尿素结晶的控制方法、装置、存储介质及电子设备
CN111749765B (zh) * 2020-07-15 2021-07-20 潍柴动力股份有限公司 尿素喷射控制方法、装置及后处理***
CN111894704B (zh) * 2020-07-24 2021-07-06 东风商用车有限公司 一种基于温度模型的尿素喷射控制方法
CN112282906B (zh) * 2020-10-30 2021-12-07 东风商用车有限公司 一种scr催化器结晶检测方法、检测装置及清除装置
CN112627945B (zh) * 2020-12-01 2022-08-05 潍柴动力股份有限公司 尿素喷射量的修正方法、装置、设备及存储介质
CN113153501B (zh) * 2021-05-07 2022-11-29 潍柴动力股份有限公司 一种尿素喷射量控制方法及相关设备
CN113431667B (zh) * 2021-07-28 2022-08-23 潍柴动力股份有限公司 一种scr鲁棒性控制方法及装置
CN114033529B (zh) * 2021-10-29 2022-12-16 江西五十铃汽车有限公司 一种sdpf***及其标定方法
CN114135376B (zh) * 2021-11-01 2023-01-06 潍柴动力股份有限公司 一种双喷嘴尿素结晶控制方法和废气后处理***
CN114964793A (zh) * 2022-04-24 2022-08-30 潍柴动力股份有限公司 Sdpf的灰载量的检测方法及设备、监测方法及装置、车辆
CN114961933B (zh) * 2022-05-11 2023-11-17 潍柴动力股份有限公司 一种scr***的氨喷射量控制方法及***
CN114961945B (zh) * 2022-07-06 2024-05-17 潍柴动力股份有限公司 一种计算氨储质量的方法及装置
CN115095410B (zh) * 2022-07-14 2023-11-17 潍柴动力股份有限公司 尾气处理的控制方法、其控制装置以及控制***
CN116838461B (zh) * 2023-08-31 2023-11-17 潍柴动力股份有限公司 一种氨储设定值的修正方法、装置、电子设备和存储介质
CN116816482B (zh) * 2023-08-31 2023-12-15 潍柴动力股份有限公司 一种尿素喷射量的修正方法、装置、电子设备和存储介质

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011087082B4 (de) * 2011-11-25 2022-12-22 Robert Bosch Gmbh Verfahren zum Betreiben eines SCRF-Katalysatorsystems
GB2500928A (en) * 2012-04-05 2013-10-09 Gm Global Tech Operations Inc Optimising ammonia generation in an exhaust system having a lean NOx trap and a selective catalytic reduction system
US9482133B2 (en) * 2012-12-18 2016-11-01 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system of internal combustion engine
WO2015036797A1 (en) * 2013-09-16 2015-03-19 Johnson Matthey Public Limited Company EXHAUST SYSTEM WITH A MODIFIED LEAN NOx TRAP
US9797286B2 (en) * 2013-10-30 2017-10-24 GM Global Technology Operations LLC SCR filter washcoat thickness efficiency compensation system
WO2016011366A1 (en) * 2014-07-18 2016-01-21 Cummins Inc. Scr exhaust aftertreatment apparatuses, systems and methods including multiple washcoat formulations
WO2016010558A1 (en) * 2014-07-18 2016-01-21 Cummins Emission Solutions, Inc. Exhaust after-treatment with dual closed-loop reductant dosers
US20160131001A1 (en) * 2014-11-06 2016-05-12 GM Global Technology Operations LLC Catalyst design for selective-catalytic-reduction (scr) filters
CN107106982B (zh) * 2014-11-19 2021-03-02 庄信万丰股份有限公司 组合scr与pna用于低温排放控制
FR3029969A1 (fr) * 2014-12-10 2016-06-17 Peugeot Citroen Automobiles Sa Dispositif de post-traitement des gaz d’echappement d’un moteur a combustion

Also Published As

Publication number Publication date
CN106837480A (zh) 2017-06-13

Similar Documents

Publication Publication Date Title
CN106837480B (zh) 一种基于模型的尿素喷射量控制方法及后处理控制***
CN106677862B (zh) 一种双喷嘴尿素喷射量控制方法及后处理控制***
US10690033B1 (en) Aftertreatment systems and methods for treatment of exhaust gas from diesel engine
US9677493B2 (en) Coordinated engine and emissions control system
CN106837488B (zh) Scr前馈控制计算方法
CN104793651A (zh) 水泥生产中sncr烟气脱硝***的喷氨量控制方法
CN105102781A (zh) 控制催化单元中的氨水平的方法
CN111828150B (zh) 一种发动机后处理器尿素喷射的控制方法
CN109411027A (zh) 一种Urea-SCR控制参数离线标定***及标定方法
CN106368772A (zh) Scr***尿素喷射控制方法
Zhang et al. SCR control strategy based on ANNs and Fuzzy PID in a heavy-duty diesel engine
Meisami-Azad et al. LPV gain-scheduled control of SCR aftertreatment systems
Haga et al. Optimized NH3 storage control for next generation urea-SCR system
Sun et al. Experimental and numerical study of Cu-SSZ-13 SCR system for NOx reduction and hydrothermal aging under diesel exhaust conditions
JP7322150B2 (ja) 車両の少なくとも一つのｓｃｒ触媒コンバータを制御するための方法および装置
Kang et al. Research on cross sensitivity of NOx sensor and Adblue injection volume in accordance with the actual situation based on cubature Kalman filter
Zhao et al. An ammonia coverage ratio observing and tracking controller: stability analysis and simulation evaluation
US11578635B2 (en) Post-treatment system, method for controlling post-treatment system, and vehicle
Hsieh et al. Nonlinear observer designs for diesel engine selective catalytic reduction (SCR) ammonia coverage ratio estimation
CN108229091A (zh) Scr后处理***化学反应动力学模型的搭建方法
Zhang et al. Multi-objective optimization of Fe-based SCR catalyst on the NOx conversion efficiency for a diesel engine based on FGRA-ANN/RF
Sowman et al. Nonlinear model predictive control for cold start selective catalytic reduction
CN209118774U (zh) 一种Urea-SCR控制参数离线标定***
Wang et al. Intelligent optimization of diesel engine Selective catalytic reduction urea injection based on multi-model state estimation to reduce NH3 slip and NOx emission
CN113606022A (zh) 尿素管路压力控制方法、发动机

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant