CN112901316A - 一种用于汽车冷起动工况下的NOx吸收系统及方法 - Google Patents
一种用于汽车冷起动工况下的NOx吸收系统及方法 Download PDFInfo
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Abstract
本发明公开了一种用于汽车冷起动工况下的NOx吸收系统及方法,包括吸收器壳体、废气进气支管和废气排气支管,废气进气支管的一端通过三通换向阀连通于主排气管,吸收器壳体设有水平设置的隔层板,吸收器壳体内位于隔层板下端设有吸附液,废气进气支管的另一端伸入吸附液内;废气排气支管的一端穿过隔层板位于吸附液液面上端,废气排气支管的另一端连通至主排气管,通过在主排气管上设置三通换向阀,利用三通换向阀将经过主排气管的尾气可选择的排入吸收器壳体内的吸附液中,进行强制吸附处理,能够减少汽车冷起动工况下的NOx的排放,本装置结构简单,具备通用性与简易性,进而减少了用车成本。
Description
技术领域
本发明涉及汽车后处理领域,具体涉及一种用于汽车冷起动工况下的NOx吸收系统及方法。
背景技术
随着经济的飞速发展,人们物质生活水平的提高,汽车保有量也持续增长,其中柴油汽车因其动力性和经济性好,所以在长途运输领域颇具市场潜力。但是其尾气污染问题也很严峻,柴油汽车排出的尾气中含有较多的NOx和碳烟,其中NOx排至大气中,容易形成酸雨,污染江河湖泊,破坏植被;碳烟悬浮在空气中,人类吸入后容易诱发肺癌等疾病。
因此,世界各国都已制定日益严格的汽车尾气排放标准,以限制汽车的尾气排放。我国的国6标准相比国5标准,对各项排放物都提出更低的限值,NOx更是缩减了5倍。现有汽车后处理技术路线通常采取“低EGR+DOC+DPF+SCR”和“优化燃烧+DOC+DPF+SCR+ASC”,现有技术中,大多是针对增加尾气流均匀性、减少安装复杂性、加热SCR系统等方面进行技术创新,然而在后处理SCR系统中,当排气温度低于200℃时,尿素喷嘴不喷射尿素,所以此时排气中的NOx不能被催化还原而排至大气中,从而污染环境,无法有效做到尾气中NOx最大化处理。
发明内容
本发明的目的在于提供一种用于汽车冷起动工况下的NOx吸收系统及方法,以克服现有技术的不足,本发明能够减少低温起动工况下汽车的NOx的排放量。
为达到上述目的,本发明采用如下技术方案:
一种用于汽车冷起动工况下的NOx吸收系统,包括吸收器壳体、废气进气支管和废气排气支管,废气进气支管的一端通过三通换向阀连通于主排气管,吸收器壳体设有水平设置的隔层板,吸收器壳体内位于隔层板下端设有吸附液,废气进气支管的另一端伸入吸附液内;废气排气支管的一端穿过隔层板位于吸附液液面上端,废气排气支管的另一端连通至主排气管。
进一步的,隔层板的上端空间与吸附液所在空间连通。
进一步的,三通换向阀包括阀体、换向电机和换向拨片,阀体上开设三个相互连通的开口,阀体设置于主排气管上,其中两个开口分别与主排气管的两端连通,最后一个开口与废气进气支管的一段连通,换向拨片设置于阀体内,换向拨片与换向电机的输出轴连接,换向拨片能够在阀体内转动,换向拨片转动使与主排气管入气端连接口只能与另外两个开口其中一个开口连通。
进一步的,三通换向阀采用球状三通阀,换向电机采用步进电机或者PWM舵机。
进一步的,吸收器壳体内位于隔层板上端空间内设有辅助空气管路,辅助空气管路的一端位于吸收器壳体外侧,辅助空气管路的另一端连通于废气进气支管。
进一步的,辅助空气管路上从入口端到另一端依次设有空气滤芯和空气泵。
进一步的,隔层板上设有用于检测吸收器壳体内上部空间未被吸附的NOx的累积存储量的NOx传感器。
进一步的,废气排气支管上设有排气电磁阀。
进一步的,还包括电控ECM,排气温度传感器、催化氧化器、颗粒物捕集器、NOx传感器、三通换向阀、空气泵和排气电磁阀均连接于电控ECM。
一种汽车冷起动工况下NOx吸收方法,包括以下步骤:
汽车启动后实时采集汽车尾气排放温度,如果排气温度小于200℃,则通过三通换向阀接通主排气管和废气进气支管;同时利用辅助空气管路向吸附液中冲入空气,同时开启排气电磁阀;当汽车尾气排放温度大于等于200℃时,接通主排气管,关闭废气排气支管,同时辅助空气管路和排气电磁阀,从而实现汽车冷起动工况下的NOx吸收。
与现有技术相比,本发明具有以下有益的技术效果:
本发明一种用于汽车冷起动工况下的NOx吸收系统,包括吸收器壳体、废气进气支管和废气排气支管,废气进气支管的一端通过三通换向阀连通于主排气管,吸收器壳体设有水平设置的隔层板,吸收器壳体内位于隔层板下端设有吸附液,废气进气支管的另一端伸入吸附液内;废气排气支管的一端穿过隔层板位于吸附液液面上端,废气排气支管的另一端连通至主排气管,通过在主排气管上设置三通换向阀,利用三通换向阀将经过主排气管的尾气可选择的排入吸收器壳体内的吸附液中,进行强制吸附处理,能够减少汽车冷起动工况下的NOx的排放,本装置结构简单,具备通用性与简易性,进而减少了用车成本。
进一步的,隔层板的上端空间与吸附液所在空间连通,吸收器壳体内位于隔层板上端空间内设有辅助空气管路,辅助空气管路的一端位于吸收器壳体外侧,辅助空气管路的另一端连通于废气进气支管,通过外加空气泵,利用空气中的氧气来氧化还原NO和少量的NO2;吸附液采用水,具备环保性与经济性,通过设置隔层板,能够防止吸收液大范围的晃动,确保气体能够充分在吸收液内吸收。
进一步的,还包括电控ECM,排气温度传感器、催化氧化器、颗粒物捕集器、NOx传感器、三通换向阀、空气泵和排气电磁阀均连接于电控ECM,利用电控ECM能够实现自动控制,提高控制精度。
本发明一种汽车冷起动工况下NOx吸收方法,通过汽车启动后实时采集汽车尾气排放温度,实现尾气的强制过滤,从而提高了排放气体的质量,安全可靠,控制方便。
附图说明
图1为本发明实施例中NOx吸收系统的吸收模式原理图。
图2为本发明实施例中NOx吸收系统的待机模式原理图。
图3为本发明实施例中NOx吸收系统的吹扫模式原理图。
图4为本发明实施例中NOx吸收方法的流程图。
图中:1.排气温度传感器;2.催化氧化器;3.颗粒物捕集器;4.主排气管;5.三通换向阀;6.SCR催化还原器;7.废气排气支管;8.排气电磁阀;9.吸收器壳体;10.吸附液;11.隔层板;12.外部空气;13.空气滤芯;14.空气泵;15.辅助空气管路;16.废气进气支管;17.NOx传感器。
具体实施方式
下面结合附图对本发明做进一步详细描述:
如图1至图3所示,一种用于汽车冷起动工况下的NOx吸收系统,包括吸收器壳体9、废气进气支管16和废气排气支管7,废气进气支管16的一端通过三通换向阀5连通于主排气管4,吸收器壳体9设有水平设置的隔层板11,吸收器壳体9内位于隔层板11下端设有吸附液10,废气进气支管16的另一端伸入吸附液内;废气排气支管7的一端穿过隔层板11位于吸附液10液面上端,废气排气支管7的另一端连通至主排气管4。隔层板11的上端空间与吸附液10所在空间连通。通过在主排气管4上设置三通换向阀5,利用三通换向阀5将经过主排气管4的尾气可选择的排入吸收器壳体9内的吸附液10中,进行强制吸附处理,通过外加空气泵,利用空气中的氧气来氧化还原NO和少量的NO2,吸附液可以采用水,具备环保性与经济性;本装置结构简单,具备通用性与简易性,进而减少了用车成本。
三通换向阀5包括阀体、换向电机和换向拨片,阀体上开设三个相互连通的开口,阀体设置于主排气管4上,其中两个开口分别与主排气管4的两端连通,最后一个开口与废气进气支管16的一段连通,换向拨片设置于阀体内,换向拨片与换向电机的输出轴连接,换向拨片能够在阀体内转动,换向拨片转动使与主排气管4入气端连接口只能与另外两个开口其中一个开口连通。具体的,三通换向阀5采用球状三通阀,换向电机采用步进电机或者PWM舵机,以精确控制换向拨片的位置。换向拨片可以采用与阀体相匹配的圆形片,而且需采用耐高温、热膨胀系数低的材料,以增加使用寿命与可靠性。
吸收器壳体9内位于隔层板11上端空间内设有辅助空气管路15,辅助空气管路15的一端位于吸收器壳体9外侧,辅助空气管路15的另一端连通于废气进气支管16。辅助空气管路15上从入口端到另一端依次设有空气滤芯13和空气泵14,利用空气泵14能够将外部空气12进过空气滤芯过滤后输入的至吸收器壳体9内,用于增压排除吸收器壳体9内经过吸附液10的NOx。
隔层板11上设有NOx传感器17,用于检测吸收器壳体9内上部空间未被吸附的NOx的累积存储量,废气排气支管7上设有排气电磁阀8,用于控制吸收器壳体9内气体的排放,防止主排气管4上的气体倒流。主排气管4位于废气排气支管7连接末端设有SCR催化还原器6,用于尾气催化处理。
吸收器壳体9侧壁开设有电控针脚插座、加液口和放液口,以分别达到ECM控制吸收器、方便加注吸附液、定期更换吸附液或清洁下隔层的目的。
为节省空间,所述空气泵14采用隔膜泵或转子泵,以提高零部件的空间利用率。主排气管位于三通换向阀5前端的管道上设有排气温度传感器1、催化氧化器2和颗粒物捕集器3,排气温度传感器1用于获取排除尾气的温度,颗粒物捕集器3用于获取排除尾气的颗粒物。
还包括电控ECM,排气温度传感器1、催化氧化器2、颗粒物捕集器3、NOx传感器17、三通换向阀5、空气泵14和排气电磁阀8均连接于电控ECM,电控ECM用于接收所述空气泵14、NOx传感器17、排气电磁阀8、排气温度传感器1的实时信息,。
如图4所示,一种用于汽车冷起动工况下的NOx吸收方法,包括以下步骤:
1)、整车上电自检,起动汽车,排气温度传感器1实时采集汽车尾气排放温度,如果排气温度小于200℃,NOx吸收系统进入吸收模式,如图1所示,此时:
2)、通过三通换向阀5接通主排气管4和废气进气支管16,关闭主排气管4排气;
3)、同时控制空气泵14转动,将外部新鲜空气与经过主排气管4的废气一起排入吸附液10中,废气中的NOx气体与空气中的氧气、吸附液发生化学反应,进而被吸收;
4)、同时开启排气电磁阀8,未被吸收的其它气体通过废气排气支管排出,废气排气支管连通至主排气管4后半段,经过主排气管4后半段上的SCR催化器6后排至大气;
5)、当排气温度上升至200℃以上时,NOx吸收系统进入待机模式,如图2所示,此时三通换向阀接通原机主排气管4,关闭废气排气支管,同时关闭空气泵14和排气电磁阀8,废气即沿着主排气管4流进SCR催化还原器6,其中的NOx即被催化还原。
所述吸收方法还包括吹扫模式,如图3所示:当NOx传感器17检测吸收器壳体内NOx值高于设定阈值,且原机SCR系统在运行时,打开空气泵14和排气电磁阀8,利用抽吸的外部空气流将NOx吸收器9内累积的NOx气体挤出至SCR催化器,进而被催化还原;当NOx传感器17的检测值低于设定阈值时,则相继关闭排气电磁阀8和空气泵14,结束吹扫。
上述实施例只为来说明本发明的技术构思及特点,其目的是让熟悉此项技术的人士能够了解本发明的内容并予以实施,并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,包括吸收器壳体(9)、废气进气支管(16)和废气排气支管(7),废气进气支管(16)的一端通过三通换向阀(5)连通于主排气管(4),吸收器壳体(9)设有水平设置的隔层板(11),吸收器壳体(9)内位于隔层板(11)下端设有吸附液(10),废气进气支管(16)的另一端伸入吸附液内;废气排气支管(7)的一端穿过隔层板(11)位于吸附液(10)液面上端,废气排气支管(7)的另一端连通至主排气管(4)。
2.根据权利要求1所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,隔层板(11)的上端空间与吸附液(10)所在空间连通。
3.根据权利要求1所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,三通换向阀(5)包括阀体、换向电机和换向拨片,阀体上开设三个相互连通的开口,阀体设置于主排气管(4)上,其中两个开口分别与主排气管(4)的两端连通,最后一个开口与废气进气支管(16)的一段连通,换向拨片设置于阀体内,换向拨片与换向电机的输出轴连接,换向拨片能够在阀体内转动,换向拨片转动使与主排气管(4)入气端连接口只能与另外两个开口其中一个开口连通。
4.根据权利要求3所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,三通换向阀(5)采用球状三通阀,换向电机采用步进电机或者PWM舵机。
5.根据权利要求2所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,吸收器壳体(9)内位于隔层板(11)上端空间内设有辅助空气管路(15),辅助空气管路(15)的一端位于吸收器壳体(9)外侧,辅助空气管路(15)的另一端连通于废气进气支管(16)。
6.根据权利要求5所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,辅助空气管路(15)上从入口端到另一端依次设有空气滤芯(13)和空气泵(14)。
7.根据权利要求1所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,隔层板(11)上设有用于检测吸收器壳体(9)内上部空间未被吸附的NOx的累积存储量的NOx传感器(17)。
8.根据权利要求1所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,废气排气支管(7)上设有排气电磁阀(8)。
9.根据权利要求5所述的一种用于汽车冷起动工况下的NOx吸收系统,其特征在于,还包括电控ECM,排气温度传感器(1)、催化氧化器(2)、颗粒物捕集器(3)、NOx传感器(17)、三通换向阀(5)、空气泵(14)和排气电磁阀(8)均连接于电控ECM。
10.一种基于权利要求9所述用于汽车冷起动工况下的NOx吸收系统的汽车冷起动工况下NOx吸收方法,其特征在于,包括以下步骤:
汽车启动后实时采集汽车尾气排放温度,如果排气温度小于200℃,则通过三通换向阀接通主排气管和废气进气支管;同时利用辅助空气管路向吸附液中冲入空气,同时开启排气电磁阀;当汽车尾气排放温度大于等于200℃时,接通主排气管,关闭废气排气支管,同时辅助空气管路和排气电磁阀,从而实现汽车冷起动工况下的NOx吸收。
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