CN111120050A - 尾气后处理系统、其控制器及控制方法 - Google Patents

尾气后处理系统、其控制器及控制方法 Download PDF

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CN111120050A
CN111120050A CN201811282074.3A CN201811282074A CN111120050A CN 111120050 A CN111120050 A CN 111120050A CN 201811282074 A CN201811282074 A CN 201811282074A CN 111120050 A CN111120050 A CN 111120050A
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injection valve
treatment liquid
main pump
aftertreatment system
exhaust gas
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刘毅
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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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
    • F01N3/2066—Selective catalytic reduction [SCR]
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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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
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    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • 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
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
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  • Exhaust Gas After Treatment (AREA)
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Abstract

本申请提供一种尾气后处理系统的控制方法，用于柴油发动机，所述尾气后处理系统包括处理液箱，自所述处理液箱将处理液抽取的主泵，与所述主泵将处理液向发动机尾气管中喷射的电磁喷射阀，控制所述主泵及电磁喷射阀的控制器，所述发动机停止工作后，继续通过处理液对喷射阀进行降温。解决发动机停止运作后没有对喷射阀进行有效降温的问题。

Description

尾气后处理系统、其控制器及控制方法
技术领域
本申请有关一种尾气后处理系统、其控制器及控制方法，尤其是一种在发动机停止工作后，继续对尾气后处理系统中的喷射阀进行冷却的尾气后处理系统、其控制器及控制方法。
背景技术
为了减少污染物的排放，在柴油机的尾气管中一般会引入尾气后处理系统以将柴油机的尾气处理后再排放入空气中。在当前的尾气后处理系统中，一般会包括处理液箱，通过主泵将处理液抽取，并自一喷射阀喷射进入尾气管中，从而使处理液与尾气管中的尾气进行反应，将尾气管中的有害物质去除或减少。喷射阀需要伸入尾气管中，尾气管中的高温尾气会使喷射阀的温度升高。尤其是在具有DPF(柴油颗粒物过滤器)的尾气后处理系统中，DPF需要进行再生，当DPF再生时，会主动提高尾气的温度，最高达到650度以上。柴油发动机具有冷却系统，在柴油发动机正常工作的过程中，冷却系统会将喷射阀纳入系统内进行降温。然而，由于该冷却系统由发动机的主泵进行驱动，一旦发动机停止工作，则主泵会同时停止工作。但，尾气管中的尾气的温度并不立时降下来，需要一个时间过程。而，在这个过程中，没有任何系统对喷射阀进行降温，会使喷射阀的温度迅速升高。在此情况下，尾气管中的喷射阀温度会升至非常高的程度。过高的温度会使处理液有气化的风险，从而生成结晶或者堵塞喷射阀。
因此，需要解决现有技术中的问题，解决在发动机停止工作后尾气后处理系统中喷射阀的冷却问题。
发明内容
本申请的目的在于解决现有技术中在发动机停止工作后，尾气后处理系统中的喷射阀过热的问题。
为完成上述发明目的，本发明提供一种尾气后处理系统的控制方法，用于柴油发动机，所述尾气后处理系统包括处理液箱，自所述处理液箱将处理液抽取的主泵，与所述主泵连通将处理液向发动机尾气管中喷射的电磁喷射阀，控制所述主泵及电磁喷射阀的控制器，所述发动机停止工作后，执行如下步骤：
S1，喷射阀关闭步骤，将所述喷射阀关闭；
S2，处理液保持步骤，将处理液保持在电磁喷射阀内预定时间；
S3，喷射阀阀打开步骤，将所述喷射阀打开；
S4，处理液回抽步骤，将保持于所述喷射阀中的处理液回抽至处理液箱。
本发明还具有以下特征，上述S1，S2，S3，S4步骤可以反复进行二次及两次以上。
本发明还具有以下特征，完成S4步骤后，执行S5步骤，关闭所述喷射阀。
本发明还具有以下特征，所述尾气后处理系统包括由发动机驱动的冷却系统，所述冷却系统用于冷却所述喷射阀，在发动机停止工作后，执行冷却系统停止工作的步骤S0。
本发明还具有以下特征，所述主泵为电磁泵，所述处理液回抽步骤S4通过主泵反转完成。
本发明还具有以下特征，所述尾气后处理系统包括可进行再生的DPF。
为完成本发明的发明目的，本申请还提供一种设置于尾气后处理系统的控制器，所述尾气后处理系统还包括处理液箱，自所述处理液箱将处理液抽取的主泵，与所述主泵连通将处理液向发动机尾气管中喷射的电磁喷射阀，所述控制器具有非易失性存储介质，其内存储有可以执行如上所述的步骤的指令序列。
为完成本发明的发明目的，本申请还提供一种尾气后处理系统，包括如上所述的控制器。
使用本申请所提供的技术方案，可以在发动机停止后继续对喷射阀进行降温。
附图说明
下面将参考附图对本申请的示例性实施例进行详细说明，应当理解，下面描述的实施例仅用于解释本申请，而不对本申请的范围作出限制，所附附图中：
图1是本发明一种尾气后处理系统的一个实施例的功能框图；
图2是本发明一种尾气后处理系统的控制方法的一个实施例的流程图。
具体实施方式
应当理解，附图仅用于对本申请进行说明，其中部件的尺寸、比例关系以及部件的数目均不作为对本申请的限制。
请参阅图1及图2所示，在本发明的一种尾气后处理系统的一个实施例的功能框图。本发明的尾气后处理系统1主要应用于柴油机，在柴油机系统中具有通过发动机驱动的冷却系统15，该冷却系统15在本实施例中使用冷却水为冷却液。尾气后处理系统1包括处理液箱11，在本实施例中处理液为一定比例的尿素水溶液，主泵12可以自处理液箱11抽取处理液，且在主泵12的下游设置电磁喷射阀13，电磁喷射阀13可以将处理液喷射进入发动机的尾气管20中，在本申请的文件中，尾气管不属于尾气后处理系统的一部分，但属于发动机的一部分。在处理液箱11、主泵12及电磁喷射阀13之间的处理液通过管道流通，管道的形式不拘，且在管道中可以设置其它部件，如过滤器、止回阀等。上述主泵12及电磁喷射阀13可以通过控制器14控制，该控制器14在本实施例中可以为单独设置的控制器，或者与其它发动机系统部件共用的控制器。该控制器14具有非易失性的存储介质，在存储介质内存储有控制指令，用以控制主泵12及电磁喷射阀13的运作。
请参阅图2所示，其为本发明控制方法的一个实施例的流程图。控制器14设置成可执行以下动作，从而控制尾气后处理系统。在发动机停止工作后，在S0步骤中，停止冷却系统15的运作；接着，S1，进行喷射阀关闭步骤，将所述喷射阀13关闭；接着，S2，处理液保持步骤，将处理液在电磁喷射阀13内保持一预定时间；S3，喷射阀阀打开步骤，将所述喷射阀13打开；再次，S4，处理液回抽步骤，将保持于所述喷射阀13中的处理液回抽至处理液箱11。需要说明的是，上述预定时间视不同类型的发动机而定，另外，在其它的实施例中，如果一次的上述动作并不能有效控制喷射阀13的温度，可以连续多次的重复上述步骤。在完成上述动作之后，可以进行最后的S5，关闭喷射阀13，防止喷射阀13被污染。
通过上述方式，在发动机停止工作而导致冷却系统15无法动作时，通过将温度较低的处理液抽取到喷射阀13的位置并保持，通过双方的热量交换达到对喷射阀13温度控制的目的。经过一次或多次热交换之后，可以控制喷射阀13的温度在可以接受的范围。

Claims (8)

1.一种尾气后处理系统的控制方法，用于柴油发动机，所述尾气后处理系统(1)包括处理液箱(11)，自所述处理液箱(11)将处理液抽取的主泵(12)，与所述主泵(12)连通将处理液向发动机尾气管(20)中喷射的电磁喷射阀(13)，控制所述主泵(12)及电磁喷射阀(13)的控制器(14)，其特征在于，所述发动机停止工作后，执行如下步骤：
S1，喷射阀关闭步骤，将所述喷射阀(13)关闭；
S2，处理液保持步骤，将处理液保持在电磁喷射阀(13)内预定时间；
S3，喷射阀阀打开步骤，将所述喷射阀(13)打开；
S4，处理液回抽步骤，将保持于所述喷射阀(13)中的处理液回抽至处理液箱(11)。
2.如权利要求1所述的控制方法，其特征在于，上述S1，S2，S3，S4步骤可以反复进行二次及两次以上。
3.如权利要求1或2所述的控制方法，其特征在于，完成S4步骤后，执行S5步骤，关闭所述喷射阀(13)。
4.如权利要求1或2所述的控制方法，其特征在于，所述尾气后处理系统包括由发动机驱动的冷却系统(15)，所述冷却系统(15)用于冷却所述喷射阀(13)，在发动机停止工作后，执行冷却系统(15)停止工作的步骤S0。
5.如权利要求1或2所述的控制方法，其特征在于，所述主泵(12)为电磁泵，所述处理液回抽步骤(S4)通过主泵(12)反转完成。
6.如权利要求1或2所述的控制方法，其特征在于，所述尾气后处理系统包括可进行再生的DPF。
7.一种设置于尾气后处理系统(10)的控制器(14)，所述尾气后处理系统(1)还包括处理液箱(11)，自所述处理液箱(11)将处理液抽取的主泵(12)，与所述主泵(12)连通将处理液向发动机尾气管(20)中喷射的电磁喷射阀(13)，其特征在于，所述控制器(14)具有非易失性存储介质，其内存储有可以执行如权利要求1至6任一项所述的步骤的指令序列。
8.一种尾气后处理系统(10)，其特征在于，包括如权利要求7所述的控制器(14)。
CN201811282074.3A 2018-10-30 2018-10-30 尾气后处理系统、其控制器及控制方法 Pending CN111120050A (zh)

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