CN105604681A - 用于控制排放气体流动的发动机*** - Google Patents
用于控制排放气体流动的发动机*** Download PDFInfo
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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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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
- F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
- F02B47/10—Circulation of exhaust gas in closed or semi-closed circuits, e.g. with simultaneous addition of oxygen
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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
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
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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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
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- 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
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- 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
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Abstract
本发明提供了一种用于控制排放气体流动的发动机***,其包括:进气管线,其设置为吸入外部空气;发动机,其用于使通过进气管线供应的外部空气与燃料在发动机的燃烧室中燃烧以产生扭矩;排放管线,其用于排放来自发动机的燃烧室中的燃烧的排放气体;涡轮增压器,其具有涡轮和压缩机,所述涡轮由穿过排放管线的排放气体操作,所述压缩机用于压缩进气管线中的外部空气;催化剂单元,其设置在涡轮增压器的下游侧以用于减少排放气体的有害成分;旁通管线,其从在涡轮增压器的下游侧的排放管线分支并且并入在催化剂单元的下游侧的排放管线;以及旁通阀,其设置在旁通管线上以用于选择性打开/关闭旁通管线。
Description
相关申请的交叉引用
本申请要求于2014年11月14日在韩国知识产权局所提交的韩国专利申请第10-2014-0158777号的优先权和权益,并通过引用将其全部内容纳入本文。
技术领域
本公开涉及用于控制排放气体流动的发动机***,该***在发动机的过速条件下,通过稳定地维持柴油机氧化型催化剂(DOC)或柴油机微粒过滤器(DPF)的温度来稳定地维持排放气体的净化率。
背景技术
目前,为了满足关于客运柴油发动机的排放气体规定,正在考虑柴油机氧化型催化剂(DOC)、柴油机微粒过滤器(DPF)、稀燃NOx捕集器(LNT)以及选择性催化还原器(SCR)单元。
诸如DOC、LNT和SCR单元的为减少排放气体而安装的后处理***需要用于化学反应的基本温度。
一般而言,在冷发动机状态下(冷却剂温度低于90℃),当排放气体温度低时,过量排放的排出物在后处理***被激活之前就排放了。结果,即使在燃料消耗上做出牺牲,还是为减少冷状态排放气体而使用了排放气体温度增加策略。
然而在过速(滑行或未完全燃烧状态)的情况下,尽管通过使用燃烧策略使排放气体温度上升成为可能,但是因为进气空气不经燃烧过程而排出,导致后处理***冷却,后处理***的温度降低,延长了达到激活温度的时间段。
公开于该发明背景技术部分的上述信息仅仅旨在加深对发明背景的理解,因此其可以包含的信息并不构成在本国已为本领域技术人员所公知的现有技术。
发明内容
已作出的本发明致力于提供一种用于控制排放气体流动的发动机***,其具有稳定地维持排放气体的净化率的益处。
本发明的目标为,提供用于控制排放气体流动的发动机***,其中例如在过速条件下,防止了在未完全燃烧的排放气体穿过催化剂单元时催化剂单元的温度下降,从而整体上提高排放气体的质量。
为实现本发明的目标,用于控制排放气体流动的发动机***可以包括:进气管线,其设置为吸入外部空气;发动机,其用于使通过进气管线供应的外部空气与燃料在发动机的燃烧室中燃烧以产生扭矩;排放管线,其用于排放来自发动机的燃烧室中的燃烧的排放气体;涡轮增压器,其具有涡轮和压缩机,所述涡轮由穿过排放管线的排放气体操作,所述压缩机用于压缩进气管线中的外部空气;催化剂单元,其设置在涡轮增压器的下游侧以用于减少排放气体的有害成分;旁通管线,其从在涡轮增压器的下游侧的排放管线分支并且并入在催化剂单元的下游侧的排放管线;以及旁通阀,其设置在旁通管线上以用于选择性打开/关闭旁通管线。
该发动机***可以进一步包括控制单元,所述控制单元用于将旁通阀选择性打开/关闭。
如果满足燃料没有喷射到发动机中且发动机的转速高于预设速度的条件,则控制单元可以打开旁通阀,使得排放气体绕过涡轮增压器和催化剂单元。如果没有满足该条件,则控制单元可以关闭旁通阀。
控制单元可以基于对加速器踏板信号、发动机的冷却剂温度、车辆速度以及氧传感器的信号的分析来控制旁通阀,所述氧传感器设置在涡轮增压器与发动机之间。
该发动机***可以进一步包括:高压排放气体再循环(EGR)管线,其从涡轮增压器与发动机之间的排放管线分支,以用于将排放气体再循环至进气管线;高压EGR冷却器,其设置在高压EGR管线上,以用于对再循环的排放气体进行冷却;以及高压EGR阀,其安装在高压EGR管线上,以用于对再循环的排放气体进行控制。
催化剂单元可以包括:柴油机氧化型催化剂(DOC),其包括氧化催化剂;以及柴油机微粒过滤器(DPF),其用于将微粒物质过滤出。
在本发明的另一方面,用于控制排放气体流动的发动机***可以包括:进气管线,其设置为吸入外部空气;发动机,其用于使通过进气管线供应的外部空气与燃料在发动机的燃烧室中燃烧以产生扭矩;排放管线,其用于排放来自发动机的燃烧室中的燃烧的排放气体;涡轮增压器,其具有涡轮和压缩机,所述涡轮由穿过排放管线的排放气体操作,所述压缩机用于压缩进气管线中的外部空气;催化剂单元,其设置在涡轮增压器的下游侧以用于减少排放气体的有害成分;旁通管线,其从在涡轮增压器的下游侧的排放管线分支并且并入在涡轮增压器的上游侧的进气管线;以及旁通阀,其设置在旁通管线上以用于选择性打开/关闭旁通管线。
该发动机***可以进一步包括控制单元,所述控制单元用于将旁通阀选择性打开/关闭。
如果满足燃料没有喷射到发动机中且发动机的转速高于预设速度的条件,则控制单元可以打开旁通阀,使得排放气体绕过涡轮增压器和催化剂单元。如果没有满足该条件,则控制单元可以关闭旁通阀。
控制单元可以基于对加速器踏板信号、发动机的冷却剂温度、车辆速度以及氧传感器的信号的分析来控制旁通阀,所述氧传感器设置在涡轮增压器与发动机之间。
该发动机***可以进一步包括:高压EGR管线,其从涡轮增压器与发动机之间的排放管线分支,以用于将排放气体再循环至进气管线;高压EGR冷却器,其设置在高压EGR管线上,以用于对再循环的排放气体进行冷却;以及高压EGR阀,其安装在高压EGR管线上,以用于对再循环的排放气体进行控制。
该发动机***可以进一步包括中间冷却器,其设置在涡轮增压器与发动机之间的进气管线上,以用于对被涡轮增压器压缩的气体进行冷却。
为实现本发明的目标,在过速条件下,未完全燃烧的发动机排放气体被控制为绕过催化剂单元,从而稳定地维持催化剂单元的温度并提高排放气体的质量。
附图说明
图1示出了与本发明有关的发动机***的示意图。
图2示出了显示与本发明有关的发动机***中的过速部段的图。
图3示出了根据本发明优选实施方案的用于控制排放气体流动的发动机***的示意图。
图4示出了根据本发明另一优选实施方案的用于控制排放气体流动的发动机***的示意图。
具体实施方式
下面将参考附图对本发明的示例性实施方案进行详细描述。
图1示出了与本发明有关的发动机***的示意图。
参照图1,该发动机***包括进气管线100、涡轮增压器110、中间冷却器120、发动机140、冷却剂温度传感器130、排放管线160、柴油机氧化型催化剂165、柴油机微粒过滤器170、高压排放气体再循环(EGR)管线150以及高压EGR冷却器155。
外部空气通过进气管线100供应到涡轮增压器110。涡轮增压器110使用在排放管线160中流动的排放气体来使涡轮旋转。涡轮压缩在进气管线100中流动的外部空气,并且将压缩的外部空气供应到发动机140的燃烧室。
中间冷却器120冷却在进气管线100中流动的进气空气,而高压EGR管线150将从发动机140的燃烧室排放的排放气体再循环至进气管线100。高压EGR管线150设置有高压EGR阀(未显示)和高压EGR冷却器155,其分别用于控制再循环排放气体的流动和温度。
在涡轮增压器110的下游侧的排放管线160上设置了催化剂单元,其中,该催化剂单元包括柴油机氧化型催化剂(DOC)165和柴油机微粒过滤器(DPF)170。
柴油机氧化型催化剂165主要用于减少排放气体中包含的有害物质,而柴油机微粒过滤器170主要用于将微粒物质从排放气体过滤出并去除。
在排放管线160中的涡轮增压器110的上游侧设置了氧传感器175,以便感测从发动机140的燃烧室排放的排放气体中包含的氧浓度,以输出关于排放气体的稀/浓状态的信号,并且冷却剂温度传感器130设置成靠近发动机140,以便感测在发动机140中循环的冷却剂的温度。
在本发明的优选实施方案中,在过速条件下,没有燃料会喷射到发动机140中,并且发动机140通过经驱动轴传递的扭矩而旋转。例如,当驾驶员的脚没有踩下加速器踏板时,没有燃料从喷射器喷射,并且发动机以快于怠速转速的速度进行旋转。
因此,外部空气经过进气管线100而被引入到发动机140中,没有完全燃尽的低温的未完全燃烧的气体经排放管线160流动,柴油机氧化型催化剂165和柴油机微粒过滤器170的温度可能迅速下降,导致柴油机氧化型催化剂165和柴油机微粒过滤器170的净化特性不佳。
图2示出了显示与本发明有关的发动机***中的过速部段的图。
参照图2,横轴表示时间,纵轴表示排放气体温度、冷却剂温度和车辆速度。因为在过速条件下没有燃料被喷射,所以车辆速度降低并且排放气体温度迅速下降,导致诸如柴油机氧化型催化剂165或柴油机微粒过滤器170的催化剂单元的净化特性变差。
图3示出了根据本发明优选实施方案的用于控制排放气体流动的发动机***的示意图。
在进气管线100中,涡轮增压器110的压缩机与中间冷却器120连续设置,且在排放管线160中,涡轮增压器110的涡轮、柴油机氧化型催化剂165以及柴油机微粒过滤器170连续设置。
高压EGR管线150从涡轮增压器110的涡轮与发动机140之间的管线分支,并且并入发动机140与中间冷却器120之间的管线。高压EGR管线150设置有高压EGR阀157和高压EGR冷却器155,其分别用于控制再循环排放气体的流动和温度。旁通管线300从涡轮增压器110的涡轮的下游侧分支,并且并入柴油机微粒过滤器170的下游侧。
即,旁通管线300从涡轮增压器110与催化剂单元165和170之间的排放管线160分支,并且并入在催化剂单元165和170的下游侧的排放管线160。
旁通管线300上设置有旁通阀310。依据旁通阀310的打开/关闭,在排放管线160中流动的排放气体可以绕过柴油机氧化型催化剂165和柴油机微粒过滤器170。
诸如发动机控制单元(ECU)的控制单元320从邻近发动机140设置的冷却剂温度传感器130接收冷却剂温度,接收来自氧传感器175的排放气体的状态,并且接收加速器踏板操作状态和发动机140的工作条件。该工作条件可以包括燃料喷射率、发动机的转速、车辆速度、冷却剂温度、排放气体状态以及变速器的状态。
基于加速器踏板状态和工作条件,如果控制单元320确定满足了过速条件,则控制单元320打开旁通阀310,以使得未完全燃烧的排放气体绕过柴油机氧化型催化剂165和柴油机微粒过滤器170。另一方面,如果控制单元320确定没有满足过速条件,则控制单元320关闭旁通阀310,从而排放气体穿过柴油机氧化型催化剂165和柴油机微粒过滤器170。
控制单元320可以为由预定程序操作的至少一个微处理器,所述预定程序可以包括用于执行根据本发明的优选实施方案的方法的一系列命令。
图4示出了根据本发明另一优选实施方案的用于控制排放气体流的发动机***的示意图。一般将省略对于与图3的部件相似的图4的部件的描述,而对于特性差异进行描述。
参照图4,旁通管线300从涡轮增压器110的涡轮的下游侧的催化剂单元(165和170)与涡轮增压器110之间的排放管线160分支,并且并入涡轮增压器110的压缩机的上游侧的进气管线100。
旁通管线300上设置有旁通阀310,并且如果满足了过速条件,则控制单元320打开旁通阀310。然后,流到涡轮增压器110的涡轮的下游侧的未完全燃烧的排放气体在涡轮增压器110的压缩机的上游侧循环入进气管线100,以使得排放气体不穿过柴油机氧化型催化剂165和柴油机微粒过滤器170。另一方面,如果控制单元320确定没有满足过速条件,则控制单元320关闭旁通阀310,从而排放气体穿过柴油机氧化型催化剂165和柴油机微粒过滤器170。
如上所述,如果在过速条件下排放未完全燃烧的排放气体,则通过打开旁通管线300上的旁通阀310以使得未完全燃烧的排放气体不穿过柴油机氧化型催化剂165和柴油机微粒过滤器170,预先防止催化剂单元(柴油机氧化型催化剂165和柴油机微粒过滤器170)的温度下降,从而能够稳定地维持净化率。
此外,在启动前,在催化剂单元的温度较低的状态(即,发动机的冷却剂温度较低的状态)下,催化剂单元的LOT(起燃时间)时长可以减小。
尽管该发明已经结合目前认为是可行的示例性实施方案加以描述,但是应该理解本发明不限于公开的实施方案。相反地,其旨在覆盖包括在所附权利要求的精神和范围内的各种改变和等价布置。
Claims (12)
1.一种用于控制排放气体流动的发动机***,包括:
进气管线,其设置为吸入外部空气;
发动机,其用于使通过进气管线供应的外部空气与燃料在发动机的燃烧室中燃烧以产生扭矩;
排放管线,其用于排放来自发动机的燃烧室中的燃烧的排放气体;
涡轮增压器,其具有涡轮和压缩机,所述涡轮由穿过排放管线的排放气体操作,所述压缩机用于压缩进气管线中的外部空气;
催化剂单元,其设置在涡轮增压器的下游侧以用于减少排放气体的有害成分;
旁通管线,其从在涡轮增压器的下游侧的排放管线分支并且并入在催化剂单元的下游侧的排放管线;以及
旁通阀,其设置在旁通管线上以用于选择性打开/关闭旁通管线。
2.根据权利要求1所述的用于控制排放气体流动的发动机***,进一步包括控制单元,所述控制单元用于将旁通阀选择性打开/关闭。
3.根据权利要求2所述的用于控制排放气体流动的发动机***,其中:
如果满足燃料没有喷射到发动机中且发动机的转速高于预设速度的条件,则控制单元打开旁通阀,使得排放气体绕过涡轮增压器和催化剂单元,以及
如果没有满足该条件,则控制单元关闭旁通阀。
4.根据权利要求3所述的用于控制排放气体流动的发动机***,其中,控制单元基于对加速器踏板信号、发动机的冷却剂温度、车辆速度以及氧传感器的信号的分析来控制旁通阀,所述氧传感器设置在涡轮增压器与发动机之间。
5.根据权利要求1所述的用于控制排放气体流动的发动机***,进一步包括:
高压排放气体再循环管线,其从涡轮增压器与发动机之间的排放管线分支,以用于将排放气体再循环至进气管线;
高压排放气体再循环冷却器,其设置在高压排放气体再循环管线上,以用于对再循环的排放气体进行冷却;以及
高压排放气体再循环阀,其安装在高压排放气体再循环管线上,以用于对再循环的排放气体进行控制。
6.根据权利要求1所述的用于控制排放气体流动的发动机***,其中所述催化剂单元包括:
柴油机氧化型催化剂,其包括氧化催化剂;以及
柴油机微粒过滤器,其用于将微粒物质过滤出。
7.一种用于控制排放气体流动的发动机***,包括:
进气管线,其设置为吸入外部空气;
发动机,其用于使通过进气管线供应的外部空气与燃料在发动机的燃烧室中燃烧以产生扭矩;
排放管线,其用于排放来自发动机的燃烧室中的燃烧的排放气体;
涡轮增压器,其具有涡轮和压缩机,所述涡轮由穿过排放管线的排放气体操作,所述压缩机用于压缩进气管线中的外部空气;
催化剂单元,其设置在涡轮增压器的下游侧以用于减少排放气体的有害成分;
旁通管线,其从在涡轮增压器的下游侧的排放管线分支并且并入在涡轮增压器的上游侧的进气管线;以及
旁通阀,其设置在旁通管线上以用于选择性打开/关闭旁通管线。
8.根据权利要求7所述的用于控制排放气体流动的发动机***,进一步包括控制单元,所述控制单元用于将旁通阀选择性打开/关闭。
9.根据权利要求8所述的用于控制排放气体流动的发动机***,其中:
如果满足燃料没有喷射到发动机中且发动机的转速高于预设速度的条件,则控制单元打开旁通阀,使得排放气体绕过涡轮增压器和催化剂单元,以及
如果没有满足该条件,则控制单元关闭旁通阀。
10.根据权利要求9所述的用于控制排放气体流动的发动机***,其中,控制单元基于对加速器踏板信号、发动机的冷却剂温度、车辆速度以及氧传感器的信号的分析来控制旁通阀,所述氧传感器设置在涡轮增压器与发动机之间。
11.根据权利要求7所述的用于控制排放气体流动的发动机***,进一步包括:
高压排放气体再循环管线,其从涡轮增压器与发动机之间的排放管线分支,以用于将排放气体再循环至进气管线;
高压排放气体再循环冷却器,其设置在高压排放气体再循环管线上,以用于对再循环的排放气体进行冷却;以及
高压排放气体再循环阀,其安装在高压排放气体再循环管线上,以用于对再循环的排放气体进行控制。
12.根据权利要求7所述的用于控制排放气体流动的发动机***,进一步包括中间冷却器,其设置在涡轮增压器与发动机之间的进气管线上,以用于对通过涡轮增压器压缩的气体进行冷却。
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