A Diesel Passenger Car Euro V Compliant System for India

With the implementation of Euro V emissions legislation in 2010, the vast majority of light-duty diesel vehicles now employ a diesel particulate filter. The expansion of the Diesel Euro V standard outside Europe is inhibited in part by the low availability of ≺50 ppm sulfur fuel. Having said this, countries such as India and China have ≺50 ppm sulfur fuel available in many urban centers today, with the geographical area covered growing each year. Whilst it is well known that diesel DPF applications require ≺50 ppm sulfur fuel for optimum long-term operation, the ability of the system to withstand periodic "high" sulfur events would be a useful enabler for the early implementation of Euro V legislation to these markets. In this paper, the authors set out to assess the capability of the DOC and cDPF exhaust gas aftertreatment system to cope with periodic high sulfur fuel events.

Earlier experimental data have demonstrated the key advantages of Palladium containing DOC and CDPF especially when used together. This paper describes results showing how both system components DOC and CDPF will react if a high sulfur content fuel is used. The conditions for the system to recover from sulfur deactivation will be investigated. In addition, the ability of the system to work a long time with an inappropriate fuel without risk of vehicle stop will be demonstrated.