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针对非道路用车辆的排放法规要求,研究人员正重新审视发动机设计,并为零部件引入最新的技术和定制排气后处理系统。降低颗粒排放是影响发动机整体性能和价格的关键问题之一。目前,业界还没有一种统一的解决办法。部分制造商采用高压燃油喷射与高效的柴油氧化催化转化器组合的方式,而另一些制造商则依靠主动再生柴油机排气颗粒过滤器技术或单用选择性催化还原技术来达到欧盟第4阶段和关国第4f阶段排放标准。考虑到上述方法的利弊,VM Motori公司决定采用一种新技术,将柴油氧化催化转化器与分流式颗粒过滤器(PM-Metalit(?))用于新型R750发动机系列。讨论这种方法的优点,同时介绍为达到排放限值所进行的应用性研究。介绍PM-Metalit(?)技术无须维护保养就可降低颗粒排放的物理及化学机理。此外,还将讨论模拟实际运行条件得出的试验结果。
In response to emissions regulations for off-road vehicles, researchers are revisiting engine designs and introducing the latest technology and custom exhaust aftertreatment systems for parts. Reducing particulate emissions is one of the key issues affecting the overall engine performance and price. At present, there is no unified solution in the industry. Some manufacturers use a combination of high-pressure fuel injection with a high-efficiency diesel oxidation catalytic converter, while others rely on active regeneration of diesel exhaust particulate filters or single-use selective catalytic reduction to reach EU Stage 4 and 4f stage off the country’s emission standards. Considering the pros and cons of the above method, VM Motori decided to adopt a new technology to use the diesel oxidation catalytic converter and the split-flow particle filter (PM-Metalit (?)) For the new R750 engine series. Discuss the merits of this approach and describe the applied research to achieve emission limits. Describe the PM-Metalit (?) Technology reduces the physical and chemical mechanisms of particle emissions without maintenance. In addition, the results of experiments simulating actual operating conditions will be discussed.