Browse Publications Technical Papers 2019-01-0978
2019-04-02

On Developing Advanced Catalysts Systems to Meet China New Regulations 2019-01-0978

Over the past few years, China has made major legislative advancements on vehicle emissions, having set forth Stage 6 regulations for both LD and HD vehicles. To meet stricter standards, OEMs and associated suppliers of the exhaust aftertreatment value chain have went through a period of unprecedented development. This paper selectively describes key challenges and highlights corresponding solutions of those development for all segments. In so doing, the authors wish to provide an overview of the catalyst systems used in upcoming Chinese automobile market. Stage 6 LDG aftertreatment system layout is first reviewed. A key challenge is the introduction of gas particulate filters (GPF). In fact, LDG vehicles in China often do not meet PM and PN targets over the whole engine map tested. This paper shares debugging process and analyses of PM and PN measurement as well as soot regeneration studies with such systems. The development and application of an advanced Stage 6 TWC technology are also discussed in this paper. The LDD segment is a niche market in China. It however has same level of technical complexity as in Europe when it comes to develop exhaust aftertreatment system to meet Stage 6. Technical trend and mainstream solution for China market will be reviewed. The HDD Stage VI is very similar to EU VI regulation. Due to uneven market application and diesel fuel quality, OEMs tend to adopt the conventional DOC+CSF+Cu-SCR systems and use proven technologies. This paper shares in detail those durability concerns and specific experiments for design validation, especially on effect of prolonged thermal aging and high sulfur fuel. The off-road Stage IV regulation is with strong China attributes. The gaseous emission standard is same as Europe Stage IIIB however it has a PN requirement like in EU Stage V. This paper discusses possible aftertreatment system roadmap, with an emphasis on SCRoF as one fit-for-market solution.

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