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The use of a diesel particulate filter (DPF) is one of the most flexible methods of reducing particulate emissions from diesel engines, and has the advantage of controlling both the number and mass of particulate emissions. To maintain engine performance over time, the soot accumulated in the filter needs to be removed by oxidation. This paper describes the development of a novel iron based fuel-borne additive that controls soot deposit build-up in DPFs. This technology controls soot accumulation at significantly lower treat rates than those of previously reported [1] additives at temperatures well below those previously required for soot combustion. Ash accumulation testing and the chemical characterisation of the ash are also described. Any successful solution to the problem of soot accumulation in the filter needs to be harm free in the field.

The use of Diesel Particulate Filters (DPFs) as a means to meet ever more stringent worldwide Particulate Matter/ Particle Number (PM/ PN) emissions regulations is increasing. Fuel Borne Catalyst (FBC) technology has now been successfully used as an effective system for DPF regeneration in factory and service fill as well as retrofit applications for several years. The use of such a technology dictates that it be stable in long term service and that it remains compatible with new and emerging diesel fuel grades. In order to ensure this, neat additive stability data have been generated in a very severe and highly transient temperature cycle and a large selection of current (Winter 2012) market fuels have been evaluated for stability with this FBC technology. Results indicate that FBC technology remains suitable. The incidence of Internal Diesel Injector Deposits (IDIDs) is increasing, particularly for advanced FIE systems.

Retrofitting current and legacy diesel vehicles with Diesel Particulate Filters (DPFs) and associated aftertreatment technology has long been an option to enable vehicles with older engines to meet specific regional emissions legislation. A major positive is the ability for enforced vehicle retrofitting to have an immediate impact on the local air quality in urban environments without vehicle owners having to purchase new vehicles. Retrofit in China in comparison to Europe, for example, is in its relative infancy as China's emission legislation rapidly moves towards adopting European like limits whilst available diesel fuel continues to have variable sulphur concentrations. This paper details the results from a two phase retrofit-study conducted to investigate the ability for Fuel Borne Catalyst (FBC) technology to regenerate DPFs in retrofitted Light Duty (LD) vehicles in China.