CN101344025B - 估算排气管中压降的方法 - Google Patents
估算排气管中压降的方法 Download PDFInfo
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- CN101344025B CN101344025B CN2008101319502A CN200810131950A CN101344025B CN 101344025 B CN101344025 B CN 101344025B CN 2008101319502 A CN2008101319502 A CN 2008101319502A CN 200810131950 A CN200810131950 A CN 200810131950A CN 101344025 B CN101344025 B CN 101344025B
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1445—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being related to the exhaust flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
- F02D41/145—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure with determination means using an estimation
-
- 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
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/0601—Parameters used for exhaust control or diagnosing being estimated
-
- 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
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Volume Flow (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
技术领域
本发明涉及一种用于估算柴油机排气管两管段之间的压降的方法。
背景技术
公知的是,流体管道任意两管段之间的压降主要是在其中流动的流体的质量流量的函数。在排气管道中,不易直接测量废气的质量流量,但在柴油机的大多数控制策略中,供给发动机的新鲜空气和燃料的流量是已知的,因此很容易从这些已知量中计算出废气的质量流量。相应的,例如在EP1 081347B1中建议使用废气流量WDPF和废气温度Tb的函数f(WDPF,Tb)估算颗粒过滤器下游侧的压力,其中,WPDF是新鲜空气流量和燃料流量的和。
函数f是一个多项式,它的系数由实验数据得出。该方法实施起来相当麻烦,因为需要大量的实验数据来拟合具有两个变量WDPF,Tb的多项式f。此外,为估算颗粒过滤器下游的压力Pb,过滤器下游侧的温度Tb必须是已知的。因此,要么必须设置一个用于测量Tb的传感器,要么建立一个计算该温度的数学模型。
发明内容
本发明所要解决的技术问题是提供一种估算柴油机排气管两管段之间的压降的方法,该方法的实施比传统方法更简单快捷。
该技术问题通过一种方法解决,该方法包括以下步骤:
-测量进入发动机的新鲜空气的流量
-测量进入发动机的燃料的流量
-由所述新鲜空气和燃料的流量计算出废气的流量,以及
-确定一估算的压降,作为所述废气流量的函数,
其特征在于,废气流量是所述新鲜空气和燃料流量的加权和,其中,燃料流量的权重系数高于新鲜空气流量的权重系数。
看来,使用这种权重系数就能以一种非常简明直接的方式考虑压降对温度的依从关系。
实验表明,燃料流量的权重系数应是新鲜空气流量的权重系数的至少两倍,而且在5倍至30倍的范围内更佳。
用于计算压降的函数优选是以废气流量为变量的多项式,并且该废气流量可以作为其唯一的变量。
如果该方法被应用于排气管,其中,一个所述管段包括一个压力传感器,另一管段包括一个给出取决于压力的读数的第二传感器,此外,该方法最好还包括以下步骤:一是根据所述压力传感器的压力读数和已估算的压降计算所述另一管段中的压力,二是根据已计算的压力补偿来自所述第二传感器的读数。这样一个第二传感器例如可以是氧气传感器。
另外,所述管段之一也可以是排气管道的下游端部。因为下游端部必然始终处于环境压力下,所以不必使用压力传感器就能计算出排气管任意管段内压力。
附图说明
本发明其它的特征和优点将通过接下来参照附图对实施形式的说明阐明。附图中:
图1是柴油机的排气***的示意图;
图2是废气流量和压降之间的相关系数的曲线图,以及
图3是测得的压降和作为废气流量函数的估算的压降的坐标图。
具体实施方式
图1示出了柴油机的发动机组1,其具有四个气缸,一用于连接发动机组各个气缸至颗粒过滤器3的废气歧管2,一***5,一在所述颗粒过滤器3和***5之间延伸的排气管道4以及一个排出口管段6。当发动机工作且废气流经图1所示的排气***时,压降出现在其任何一个组件中,因此,例如邻近颗粒过滤器3入口的氧气传感器7承受的压力可能与处于排气歧管2上游部分的压力传感器8测得的压力不同,并且,颗粒过滤器3承受的压降不同于传感器8测得的压力和环境压力之间的压差。
为了估算排气***任意两点之间或排气***一特定点与外部环境之间的压降,必须知道流经排气***的质量流量。通常会在发动机的进气歧管内设一个空气流传感器9,用于检测流入气缸的新鲜空气流量,并且供给气缸的燃料会被测量,因此也是已知的。由此可以推断出,从发动机组1排出的废气的质量流量应该是新鲜空气的流量和燃料流量的和。然而,发现基于这样计算得出的废气流量,不能完全可靠地预测排气***中的压降。这并不奇怪,因为,公知的是压降不仅取决于质量流量,还取决于流动气体的温度,并且该温度可能会随发动机的工作条件变化。然而,令人惊奇的是,发现用给出的加权质量流量M替换上面的代数质量流量就能考虑到这一影响,其中k是正的常数。
图2是图1所示排气***中所测量的压降和所估算的压降之间的相关系数R2作为权重系数k的函数的曲线图。该曲线图中,代数质量流量相当于权重系数k=1。在该权重系数下,测量压降和估算压降间的相关系数略高于0.96。在权重系数k=2时,相关系数变得高于0.97。在6<k<28的范围内,相关系数高于0.99,在12<k<15时,相关系数几乎完全地为>0.998。显然,排气***中的压降与任何温度和/或负载的依从关系可以通过选择恰当的权重系数k的值而被完美地考虑到。
图3示出了压降Δp和加权的质量流量在发动机的实际工作范围内的关系。在该图中,各点表示所测得的值,曲线f给出了加权质量流量和压降之间的估算关系。估算的数据和实验数据几乎完全一致。图3所示的曲线f是二项式或多项式,其例如可以通过与实验数据的最小二乘法拟合获得。
权重系数k的最优值在一定程度上取决于发动机的特性。然而,通过获取压降Δp的实验数据,新鲜空气流量和燃料流量并且进行公式中的多项式系数a2,a1和权重系数k的最小二乘法拟合,可以相当直接明了地得出给定发动机的最优权重系数。
附图标记列表
发动机组1
排气歧管2
颗粒过滤器3
排气管道4
***5
出口管段6
氧气传感器7
压力传感器8
空气流量传感器9
Claims (6)
5.按权利要求1或2所述的方法,其中,所述管段之一包括一个压力传感器(8),并且所述另一管段包括一个给出取决于压力的读数的第二传感器(7),此外,该方法还包括根据所述压力传感器(8)的压力读数和所述估算的压降计算所述另一管段中的压力的步骤,以及包括根据所计算出的压力补偿来自于所述第二传感器(7)的读数的步骤。
6.按权利要求1或2所述的方法,其中,所述管段之一是所述排气管道的下游端部(6)。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000385A ITRM20070385A1 (it) | 2007-07-12 | 2007-07-12 | Procedimento di stima della caduta di pressione tra due sezioni della linea di scarico di un motore a combustione interna. |
ITRM2007A385 | 2007-07-12 |
Publications (2)
Publication Number | Publication Date |
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CN101344025A CN101344025A (zh) | 2009-01-14 |
CN101344025B true CN101344025B (zh) | 2012-07-11 |
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CN2008101319502A Expired - Fee Related CN101344025B (zh) | 2007-07-12 | 2008-07-02 | 估算排气管中压降的方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090018784A1 (zh) |
EP (1) | EP2014888B1 (zh) |
CN (1) | CN101344025B (zh) |
AT (1) | ATE519025T1 (zh) |
IT (1) | ITRM20070385A1 (zh) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US7987672B2 (en) * | 2008-01-22 | 2011-08-02 | GM Global Technology Operations LLC | Turbocharger protection systems and methods |
US20110160919A1 (en) * | 2009-12-30 | 2011-06-30 | Orr David C | Mobile fluid delivery control system and method |
US8360343B2 (en) | 2010-04-30 | 2013-01-29 | Caterpillar Inc. | Methods and systems for executing fluid delivery mission |
JP6379838B2 (ja) | 2014-08-11 | 2018-08-29 | いすゞ自動車株式会社 | センサ |
CN109736924A (zh) * | 2018-12-29 | 2019-05-10 | 成都威特电喷有限责任公司 | 一种基于dpf后处理控制的柴油机排气流量统计*** |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4986069A (en) * | 1989-08-29 | 1991-01-22 | Donaldson Company, Inc. | Engine exhaust particle trap captured mass sensor |
DE19933988A1 (de) * | 1998-07-20 | 2000-01-27 | Renault | Verfahren und Vorrichtung zur Bestimmung der Rußbeladung eines Partikelfilters |
EP1092847A2 (de) * | 1999-10-14 | 2001-04-18 | Volkswagen Aktiengesellschaft | Verfahren zur Ermittlung des Beladungswertes eines Partikelfilters in Verbrennungskraftmaschinen, insbesondere Dieselmotoren |
US6352065B1 (en) * | 1997-09-17 | 2002-03-05 | Robert Bosch Gmbh | Method and device for determining the gas intake in an internal combustion engine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2154011C (en) * | 1995-07-17 | 1999-06-08 | Gerhard O. Klopp | Exhaust gas recirculation system for a compression ignition engine and a method of controlling exhaust gas recirculation in a compression ignition engine |
EP1081347B1 (en) * | 1999-09-03 | 2003-04-23 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Method to determine the amount of diesel particulate accumulated in a DPF |
DE102004040924B4 (de) * | 2004-08-24 | 2019-04-11 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Überwachung von Drucksensoren im Abgasstrang |
-
2007
- 2007-07-12 IT IT000385A patent/ITRM20070385A1/it unknown
-
2008
- 2008-05-21 AT AT08009370T patent/ATE519025T1/de not_active IP Right Cessation
- 2008-05-21 EP EP08009370A patent/EP2014888B1/en not_active Not-in-force
- 2008-07-02 CN CN2008101319502A patent/CN101344025B/zh not_active Expired - Fee Related
- 2008-07-10 US US12/171,145 patent/US20090018784A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4986069A (en) * | 1989-08-29 | 1991-01-22 | Donaldson Company, Inc. | Engine exhaust particle trap captured mass sensor |
US6352065B1 (en) * | 1997-09-17 | 2002-03-05 | Robert Bosch Gmbh | Method and device for determining the gas intake in an internal combustion engine |
DE19933988A1 (de) * | 1998-07-20 | 2000-01-27 | Renault | Verfahren und Vorrichtung zur Bestimmung der Rußbeladung eines Partikelfilters |
EP1092847A2 (de) * | 1999-10-14 | 2001-04-18 | Volkswagen Aktiengesellschaft | Verfahren zur Ermittlung des Beladungswertes eines Partikelfilters in Verbrennungskraftmaschinen, insbesondere Dieselmotoren |
Also Published As
Publication number | Publication date |
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CN101344025A (zh) | 2009-01-14 |
US20090018784A1 (en) | 2009-01-15 |
ITRM20070385A1 (it) | 2009-01-13 |
ATE519025T1 (de) | 2011-08-15 |
EP2014888B1 (en) | 2011-08-03 |
EP2014888A2 (en) | 2009-01-14 |
EP2014888A3 (en) | 2010-03-24 |
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