CN106837486A - 气助式尿素喷射系统及气助式尿素喷射控制方法 - Google Patents
气助式尿素喷射系统及气助式尿素喷射控制方法 Download PDFInfo
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Abstract
本发明提供了一种气助式尿素喷射控制方法及系统,包括尿素进液口、尿素回液口、进气口、尿素喷射口、泵进口单向阀、尿素泵、泵出口单向阀、背压阀、空气单向阀、溢流阀、空气减压阀、空气电磁阀、空气促动阀、压力开关、尿素喷嘴以及设置在尿素喷嘴上的喷嘴单向阀,尿素进液口、泵进口单向阀、尿素泵、泵出口单向阀、背压阀、尿素喷射口、喷嘴单向阀以及尿素喷嘴依次连接构成尿素喷射回路,并且,尿素进液口、泵进口单向阀、尿素泵、泵出口单向阀、压力开关、空气促动阀以及尿素回液口通过管路依次连接构成尿素回液回路,并且,进气口、空气电磁阀、空气减压阀、溢流阀以及空气单向阀通过管路依次连接构成尿素吹扫回路。
Description
技术领域
本发明涉及SCR技术,特别涉及气助式尿素喷射系统及气助式尿素喷射控制方法。
背景技术
为了满足越来越严格的排放法规,单靠柴油机燃烧过程的改进,各种优化策略的应用,达到国Ⅳ法规排放要求已是极限。为此各类排气后处理装置的研发应声而起。机外净化技术包括前处理技术和后处理技术。前处理技术通过改变进气和燃油质量,来减少发动机缸内燃烧过程中污染物的生成;后处理技术通过对排气系统中已经生成的污染物进行处理,减少发动机最终排放的污染物。相对于前处理技术,后处理技术的方法较多,效果较好。
目前,柴油机尾气后处理技术中最为主流的技术为选择性催化还原技术(SCR),SCR技术的主要原理是向尾气中喷尿素,尿素水解成氨气,在催化剂的作用下与尾气中的氮氧化物反应,将其还原成对环境无害的氮气。
尿素喷射系统是SCR系统中的核心零部件,目前主流的尿素喷射系统有非气助式尿素喷射系统和气助式尿素喷射系统,气助式尿素喷射系统需要辅助气源,提高喷嘴雾化。
具体地,如图1所示,现有的气助式尿素喷射系统包括尿素进液口A、尿素回液口B、进气口C、尿素喷射口D、泵进口单向阀1、尿素泵2、泵出口单向阀3、背压阀4、空气单向阀5、溢流阀6、空气减压阀7、空气电磁阀8、空气促动阀9、压力开关10及尿素喷嘴11。
其中,该气助式尿素喷射系统工作过程大体分为排空过程、等待过程、喷射过程和吹扫过程四个步骤:
钥匙开关转到ON位置,尿素泵2(例如为隔膜泵)开始排空,空气电磁阀8关闭,空气促动阀9关闭,尿素由尿素进液口A沿着由带有箭头的线E指示的路径经尿素回液口B流回尿素箱,排空完成后尿素泵的电机停转;
排空完成后,空气电磁阀8打开,空气促动阀9打开,尿素回液通道被关闭,压缩空气由进气口C沿着由带有箭头的线F指示的路径经尿素喷射口D和尿素喷嘴11吹出,此过程中尿素喷射管中没有尿素;
当有尿素喷射需求时,电机开始转动,尿素喷射管中重新预注尿素;当无尿素喷射需求时,电机停转,尿素喷射管中尿素被压缩空气吹出,因此,每次有尿素喷射需求时,尿素喷射管将被重新预注尿素,并且电机将由0rpm运转到规定的转速,这样就导致尿素喷射延时。
可见,尿素喷射管内尿素重新预注和电机重新运转到规定转速是影响气助式喷射系统响应性的主要两个因素,这两个因素导致气助式尿素喷射系统响应性差,进而影响柴油机的尾气排放。
发明内容
本发明的目的是解决上述缺陷,特别是能够提高气助式喷射系统的尿素喷射响应性,及时降低发动机的尾气排放。上述目的是通过以下技术方案实现的。
本发明提供了一种气助式尿素喷射系统,所述气助式尿素喷射系统包括尿素进液口、尿素回液口、进气口、尿素喷射口、泵进口单向阀、尿素泵、泵出口单向阀、背压阀、空气单向阀、溢流阀、空气减压阀、空气电磁阀、空气促动阀、压力开关、尿素喷嘴以及设置在所述尿素喷嘴上的喷嘴单向阀,所述尿素进液口、所述泵进口单向阀、所述尿素泵、所述泵出口单向阀、所述背压阀、所述尿素喷射口、所述喷嘴单向阀以及所述尿素喷嘴依次连接构成尿素喷射回路,并且,所述尿素进液口、所述泵进口单向阀、所述尿素泵、所述泵出口单向阀、所述压力开关、所述空气促动阀以及所述尿素回液口通过管路依次连接构成尿素回液回路,并且,所述进气口、所述空气电磁阀、所述空气减压阀、所述溢流阀以及所述空气单向阀通过管路依次连接构成尿素吹扫回路。
另外,所述气助式尿素喷射系统还包括第二溢流阀,所述第二溢流阀设置在所述压力开关与所述空气电磁阀之间的管路上。
另外,所述尿素泵为隔膜泵。
本发明还提供了一种气助式尿素喷射控制方法,所述气助式尿素喷射控制方法是利用根据权利要求1至3中任一项所述的气助式尿素喷射系统来执行的,所述气助式尿素喷射控制方法包括以下步骤:
S1:在钥匙开关打到ON位置时,尿素泵进入初始状态,完成尿素泵上电自检;
S2:自检无故障后尿素泵进入泵停状态;
S3:当排空条件满足时尿素泵进入排空状态,此时尿素从尿素进液口沿尿素回液回路经尿素回液口流回尿素箱,将尿素泵液压腔的空气排出;
S4:排空完成后等待尿素喷射指令;
S5:判断是否有尿素喷射指令,若有尿素喷射指令,则空气电磁阀打开,尿素回液回路被关闭,尿素泵的电机按照需求转速运转,尿素从尿素进液口经尿素喷射回路从尿素喷嘴喷出,进行尿素喷射,若无尿素喷射指令,则空气电磁阀关闭,尿素回液回路被打开,电机以一定转速运转,此时尿素喷射回路中存留部分尿素;
S6:当钥匙开关打到OFF位置时,尿素泵进入吹扫状态,空气电磁阀打开,尿素回液回路被打开,电机停转,压缩空气将尿素喷射回路中的尿素吹出,避免在喷嘴单向阀和尿素喷嘴处结晶。
本发明的优点在于:
本发明在尿素喷嘴中安装单向阀,在硬件上改动小,简单修改尿素泵的控制逻辑的情况下,就能达到提高气助式尿素喷射系统响应性的目的。此外,本发明能够明显降低柴油机排放标定难度,降低NOx排放,改善环境。
本发明在无尿素喷射需求时,尿素管中仍存留部分尿素,减少尿素喷射管重新预注的时间,并且电机以一定的转速运转来“随时待命”,提高了电机的响应性;再通过相应逻辑的配合,既能够保证尿素泵的正常工作,又能大大提高尿素喷射的响应性,及时降低发动机的尾气排放。
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示出了现有技术中的气助式尿素喷射系统;
图2示出了根据本发明实施方式的气助式尿素喷射系统;
图3示出了根据本发明实施方式的气助式尿素喷射控制方法的控制流程图。
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。
现在将参照图2来描述根据本发明的实施方式的气助式尿素喷射系统,该气助式尿素喷射系统包括尿素进液口A、尿素回液口B、进气口C、尿素喷射口D、泵进口单向阀1、尿素泵(例如为隔膜泵)2、泵出口单向阀3、背压阀4、空气单向阀5、溢流阀6、空气减压阀7、空气电磁阀8、空气促动阀9、压力开关10、尿素喷嘴11以及设置在尿素喷嘴11上的喷嘴单向阀13。尿素进液口A、泵进口单向阀1、尿素泵2、泵出口单向阀3、背压阀4、尿素喷射口D、喷嘴单向阀13以及尿素喷嘴11依次连接构成尿素喷射回路。尿素进液口A、泵进口单向阀1、尿素泵2、泵出口单向阀3、压力开关10、空气促动阀9以及尿素回液口B通过管路依次连接构成尿素回液回路。进气口C、空气电磁阀8、空气减压阀7、溢流阀6、空气单向阀5通过管路依次连接构成尿素吹扫回路。
增加喷嘴单向阀13的优点在于:在尿素喷射状态下,从有尿素喷射需求到无喷射需求时,保证尿素不被压缩空气吹到排气管中(此时需要通过控制逻辑关闭空气电磁阀9),而在有尿素喷射需求(此时需要通过控制逻辑打开空气电磁阀9)时,尿素喷射管不需要重新预注尿素。
另外,该气助式尿素喷射系统还包括第二溢流阀12,第二溢流阀12设置在压力开关10与空气电磁阀9之间的管路上。
增加第二溢流阀12的优点在于:在无尿素喷射量的情况下,尿素回流的同时保持喷射管内的尿素具有一定压力。
下面结合图2和图3来描述根据本发明的实施方式的气助式尿素喷射控制方法,该气助式尿素喷射控制方法是利用上述气助式尿素喷射系统来执行的,该气助式尿素喷射控制方法包括以下步骤:
S1:在钥匙开关打到ON位置时,尿素泵进入初始状态,完成尿素泵上电自检;
S2:自检无故障后(即,上电自检完成)尿素泵进入泵停状态;
S3:当排空条件满足时尿素泵进入排空状态,此时尿素从尿素进液口沿尿素回液回路经尿素回液口流回尿素箱(如由图2中带有箭头的线G指示的路径),将尿素泵液压腔的空气排出;
S4:排空完成后(即,建压完成)等待尿素喷射指令(即,等待进入喷射状态);
S5:判断是否有尿素喷射指令(即,喷射量是否为0),若有尿素喷射指令(即,喷射量不为0),则空气电磁阀打开,尿素回液回路(即,尿素回流)被关闭,尿素泵的电机按照需求转速运转,尿素从尿素进液口经尿素喷射回路从尿素喷嘴喷出,进行尿素喷射,若无尿素喷射指令(即,喷射量为0),则空气电磁阀关闭,尿素回液回路(即,尿素回流)被打开,电机以一定转速运转,此时尿素喷射回路中存留部分尿素;
S6:当钥匙开关打到OFF位置(或者故障或者通讯中断)时,尿素泵进入吹扫状态,空气电磁阀打开,尿素回液回路被打开,电机停转,压缩空气将尿素喷射回路中的尿素吹出(如由图2中带有箭头的线H指示的路径),避免在喷嘴单向阀和尿素喷嘴处结晶。
本发明在尿素喷嘴中安装单向阀,在硬件上改动小,简单修改尿素泵的控制逻辑的情况下,就能达到提高气助式尿素喷射系统响应性的目的。此外,本发明能够明显降低柴油机排放标定难度,降低NOx排放,改善环境。
本发明在无尿素喷射需求时,尿素管中仍存留部分尿素,减少尿素喷射管重新预注的时间,并且电机以一定的转速运转来“随时待命”,提高了电机的响应性;再通过相应逻辑的配合,既能够保证尿素泵的正常工作,又能大大提高尿素喷射的响应性,及时降低发动机的尾气排放。
另外,该气助式尿素喷射控制方法还包括以下步骤:从泵停状态、排空状态、喷射状态接收诊断命令,进入故障诊断状态,并且在有故障的情况下发出通讯中断或点火开关关闭并进入泵停状态。
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 (4)
1.一种气助式尿素喷射系统,其特征在于,所述气助式尿素喷射系统包括尿素进液口、尿素回液口、进气口、尿素喷射口、泵进口单向阀、尿素泵、泵出口单向阀、背压阀、空气单向阀、溢流阀、空气减压阀、空气电磁阀、空气促动阀、压力开关、尿素喷嘴以及设置在所述尿素喷嘴上的喷嘴单向阀,所述尿素进液口、所述泵进口单向阀、所述尿素泵、所述泵出口单向阀、所述背压阀、所述尿素喷射口、所述喷嘴单向阀以及所述尿素喷嘴依次连接构成尿素喷射回路,并且,所述尿素进液口、所述泵进口单向阀、所述尿素泵、所述泵出口单向阀、所述压力开关、所述空气促动阀以及所述尿素回液口通过管路依次连接构成尿素回液回路,并且,所述进气口、所述空气电磁阀、所述空气减压阀、所述溢流阀以及所述空气单向阀通过管路依次连接构成尿素吹扫回路。
2.根据权利要求1所述的气助式尿素喷射系统,其特征在于,所述气助式尿素喷射系统还包括第二溢流阀,所述第二溢流阀设置在所述压力开关与所述空气电磁阀之间的管路上。
3.根据权利要求1或2所述的气助式尿素喷射系统,其特征在于,所述尿素泵为隔膜泵。
4.一种气助式尿素喷射控制方法,其特征在于,所述气助式尿素喷射控制方法是利用根据权利要求1至3中任一项所述的气助式尿素喷射系统来执行的,所述气助式尿素喷射控制方法包括以下步骤:
S1:在钥匙开关打到ON位置时,尿素泵进入初始状态,完成尿素泵上电自检;
S2:自检无故障后尿素泵进入泵停状态;
S3:当排空条件满足时尿素泵进入排空状态,此时尿素从尿素进液口沿尿素回液回路经尿素回液口流回尿素箱,将尿素泵液压腔的空气排出;
S4:排空完成后等待尿素喷射指令;
S5:判断是否有尿素喷射指令,若有尿素喷射指令,则空气电磁阀打开,尿素回液回路被关闭,尿素泵的电机按照需求转速运转,尿素从尿素进液口经尿素喷射回路从尿素喷嘴喷出,进行尿素喷射,若无尿素喷射指令,则空气电磁阀关闭,尿素回液回路被打开,电机以一定转速运转,此时尿素喷射回路中存留部分尿素;
S6:当钥匙开关打到OFF位置时,尿素泵进入吹扫状态,空气电磁阀打开,尿素回液回路被打开,电机停转,压缩空气将尿素喷射回路中的尿素吹出,避免在喷嘴单向阀和尿素喷嘴处结晶。
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