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PM (Particulate Matter) emission from Diesel vehicles has been a major concern to countries worldwide due to the negative impact on human health and the environment. With the increasing stringency of emissions regulations, new effective diesel emission control systems are needed for in-use and new diesels vehicles. In order to improve SPM levels in the urban areas of Japan, most local governments are considering new legislation. This legislation will require old in-use diesel vehicles to be retrofitted with a PM reduction device, such as a DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) or CRT™ (Continuously Regenerating Technology). The CRT™ (Continuously Regenerating Technology) system is an effective device for reduction of PM from in-use diesels. The CRT™ consists of a DOC and a particulate filter which is conventionally a wall-through filter. In the present, more than 30,000 vehicles worldwide are operating with this device.

Various types of after-treatment system for BS VI Stage 1 are being assessed for the Light Duty Diesel (LDD) segment. For BS VI Stage 2, Real Driving Emission (RDE) assessment will be newly introduced, which will require more robustness in emission control system capability. Although the detailed requirements for India BS VI stage 2 are still being discussed, a reasonable assumption is that similar systems to those being developed for Euro 6d, will work for India BS VI. This paper describes typical system designs for Euro 6d and also reveals newly developed SCRF® (Selective Catalytic Reduction Filter) based systems, which demonstrate excellent RDE emissions. In addition, newly developed Lean NOx Trap (NSC) coatings, which focus on low temperature NOx control used with SCRF® (NSC + SCRF®) also show excellent emission control capability as demonstrated in this case on the ARTEMIS Cycle. These systems have potential as promising LDD solutions for India BS VI stage 2.