CN110792488A - 一种满足轻型柴油车国六b要求的排气后处理系统 - Google Patents
一种满足轻型柴油车国六b要求的排气后处理系统 Download PDFInfo
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Abstract
本发明涉及汽车技术领域,尤其涉及一种满足轻型柴油车国六b要求的排气后处理系统。NSC、CDPF、SCR催化器依次串联在发动机增压器后,NSC与增压器紧耦合,NSC和底盘式的CDPF通过球形减震器实现紧耦合,SCR配置在车辆底盘处,同时配有尿素喷嘴、尿素管、集成尿素泵的尿素箱及其加注管。通过优化标定程序,实现NSC能在一个WLTC循环下再生10次,每次再生持续时间为2~4s,使得其在WLTC循环工况下,整个后处理对NOx转化效率高达93%,同时由于NSC再生处理NOx,使得整个WLTC循环工况下的前2个阶段,尿素喷射系统都不用喷射尿素,进一步降低了尿素消耗量。
Description
技术领域
本发明涉及汽车技术领域,尤其涉及一种满足轻型柴油车国六b要求的排气后处理 系统。
背景技术
为更好的实现节能降耗、保卫蓝天计划,北京、深圳、广东、海南省等省市都提前实施了轻型柴油国六b标准,国六b标准要求更加严格,相比于国五而言,国六b排放标准中对各项排放污染物限制要求大幅增加,特别是对NOx的要求,提升了82%其他各项污染物平均都有50%提升,同时试验方法由原来NEDC循环更换为更加严格的WLTC循环,从而使得GB18352 6-2016 轻型汽车污染物排放限值及测量方法(中国第六阶段)成为了全球最为严格的排放法规。
以往轻型柴油国五车辆使用的DOC+CDPF后处理系统已经无法如此严格 的法规和测试工况要求,且中国大部分城市将在2019年实施国六b标准, 预留给整车厂量产满足国六b要求的车型仅2年左右的时间,因此急需要 新型的后处理系统来实现此要求,特别是大幅降低NOx的后处理技术,以 便能够尽快量产符合法规和市场需求的国六b轻型柴油车。
发明内容
本发明的目的在于克服现有技术的不足,适应现实需要,提供一种满足 轻型柴油车国六b要求的排气后处理系统。
为了实现本发明的目的,本发明采用的技术方案为:NSC、CDPF、SCR催化器依次串联在发动机增压器后,NSC与增压器紧耦合,NSC和底盘式的CDPF通过球形 减震器实现紧耦合,SCR配置在车辆底盘处,同时配有尿素喷嘴、尿素管、 集成尿素泵的尿素箱及其加注管。
NSC催化器将发动机排放出来高浓度NOX有害物进行吸附存储NOx,在达到标 定设定的条件后,NSC将存储的NOx再生释放和DSOX脱硫,即NSC通过吸附存储rich model、NSCDNOx再生lean model、NSC DSOx脱硫等将发动机排放出来的NOx大幅降 低。
CDPF催化器将由于发动机排放出来的颗粒物通过壁流式载体捕集在载体中存储,在达到标定设定条件后,CDPF进行颗粒物主动再生,将PM转化为CO2,同时CDPF中 的贵金属催化剂会将由发动机产生的有毒的高浓度CO、NHMC等污染物转化为无毒的 CO2
SCR催化剂配合尿素系统提供的NH3,进一步降低来自SCR上游的NOx。
本发明的有益效果在于:
新颖点1:此后处理系统包含紧耦合NSC和CDPF,底盘式SCR三者串联组成,为国 内首创,此系统已经完成整车各项性能验证,可以实现量产。
新颖点2:通过使用长度为60mm的球形减振器替代原来180mm的波纹管,使得 CDPF前移120mm,NSC和底盘式的CDPF实现紧耦合,使得CDPF入口温度提升30℃, 进而大大提高了CDPF对CO、PM、NHMC等污染物的转化效率;
新颖点3:通过优化标定程序,实现NSC能在一个WLTC循环下再生10次,每次 再生持续时间为2~4s,使得其在WLTC循环工况下,整个后处理对NOx转化效率高达 93%,同时由于NSC再生处理NOx,使得整个WLTC循环工况下的前2个阶段,尿素喷 射系统都不用喷射尿素,进一步降低了尿素消耗量。
新颖点4:由于NSC频繁再生,需要高浓度的CO,此再生可以提高NOx转化效率, 但因此会带来高浓度的CO、NHMC污染物由NSC出口进入CDPF入口,原设计的CDPF 贵金属涂覆浓度为5g/cft,无法有效转化高浓度的CO、NHMC污染物,小组经过多轮试 验,最终将CDPF贵金属涂覆浓度由5g/cft提升至20g/cft后,CDPF最终有效的处理了 高浓度的CO、NHMC污染物;
综合上述新颖的手段,整个后处理系统的转化效率提升8%,其中对NOx转化效率高达93%,匹配了此后处理系统的车型排气尾管排放值不仅满足了国六b排放限值,而 且NOx还有46%的工程余量,且百公里尿素消耗量可以降低30%。
附图说明
下面结合附图和实施案例对本发明做进一步的说明。
图1为后处理体统组成图。
其中,10-柴油稀薄氮氧化物捕集催化器NSC;20-球形减振器;30—柴油颗粒捕集器CDPF;40—SCR;50-消声器;60—尾管。
具体实施方式
下面结合附图和实施例对本发明进一步说明:
参见图1。
本发明公开了NSC、CDPF、SCR催化器依次串联在发动机增压器后,NSC与增压器 紧耦合,NSC和底盘式的CDPF通过球形减震器实现紧耦合,SCR配置在车辆底盘处,同 时配有尿素喷嘴、尿素管、集成尿素泵的尿素箱及其加注管。
NSC催化器将发动机排放出来高浓度NOX有害物进行吸附存储NOx,在达到标定 设定的条件后,NSC将存储的NOx再生释放和DSOX脱硫,即NSC通过吸附存储rich model、NSCDNOx再生lean model、NSC DSOx脱硫等将发动机排放出来的NOx大幅降 低。
CDPF催化器将由于发动机排放出来的颗粒物通过壁流式载体捕集在载体中存储,在达到标定设定条件后,CDPF进行颗粒物主动再生,将PM转化为CO2,同时CDPF中 的贵金属催化剂会将由发动机产生的有毒的高浓度CO、NHMC等污染物转化为无毒的 CO2
SCR催化剂配合尿素系统提供的NH3,进一步降低来自SCR上游的NOx。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明 说明书及附图内容所作的等同变换或直接或间接运用在相关的技术领域,均同理包括在 本发明的专利保护范围内。
Claims (4)
1.一种满足轻型柴油车国六b要求的排气后处理系统,其特征在于:NSC、CDPF、SCR催化器依次串联在发动机增压器后,NSC与增压器紧耦合,NSC和底盘式的CDPF通过球形减震器实现紧耦合,SCR配置在车辆底盘处,同时配有尿素喷嘴、尿素管、集成尿素泵的尿素箱及其加注管。
2.根据权利要求1所述的一种满足轻型柴油车国六b要求的排气后处理系统,其特征在于:NSC催化器将发动机排放出来高浓度NOX有害物进行吸附存储NOx,在达到标定设定的条件后,NSC将存储的NOx再生释放和DSOX脱硫,即NSC通过吸附存储rich model、NSC DNOx再生lean model、NSC DSOx脱硫等将发动机排放出来的NOx大幅降低。
3.根据权利要求1所述的一种满足轻型柴油车国六b要求的排气后处理系统,其特征在于:CDPF催化器将由于发动机排放出来的颗粒物通过壁流式载体捕集在载体中存储,在达到标定设定条件后,CDPF进行颗粒物主动再生,将PM转化为CO2,同时CDPF中的贵金属催化剂会将由发动机产生的有毒的高浓度CO、NHMC等污染物转化为无毒的CO2及水。
4.根据权利要求1所述的一种满足轻型柴油车国六b要求的排气后处理系统,其特征在于:SCR催化剂配合尿素系统提供的NH3,进一步降低来自SCR上游的NOx。
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Cited By (4)
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CN111830190A (zh) * | 2020-07-23 | 2020-10-27 | 安徽江淮汽车集团股份有限公司 | 氧化型催化器标定方法、装置、设备及存储介质 |
CN111828187A (zh) * | 2020-07-31 | 2020-10-27 | 江铃汽车股份有限公司 | 一种柴油氮氧化物存储及催化反应控制策略 |
CN111999071A (zh) * | 2020-07-20 | 2020-11-27 | 无锡伟博汽车科技有限公司 | 一种基于nh3传感器的整车scr标定试验系统 |
CN114046197A (zh) * | 2021-10-11 | 2022-02-15 | 潍柴动力股份有限公司 | 一种废气处理的方法、装置及可读存储介质 |
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