Browse Publications Technical Papers 2019-01-0981

Analysis of the Pressure Drop Increase Mechanism by Ash Accumulated of Coated GPF 2019-01-0981

With accelerating exhaust gas regulations in recent years, not only CO / HC / NOx but also PN regulation represented by Euro 6 d, China 6 are getting stricter. PN reduction by engine combustion technology development also progresses, but considering RDE, PN reduction by after treatment technology is also indispensable. To reduce PN exhausted from the gasoline engine, it is effective to equip GPF with a filter structure.
Considering the installation of GPF in limited space, we developed a system that so far replaces the second TWC with GPF for the TWC 2 bed system. In order to replace the second TWC with GPF, we chose the coated GPF with filtering and TWC functions. Since the initial pressure drop and the catalyst amount (purification performance) of coated GPF have a conflicting relationship, we developed the coated GPF that can achieve both the low initial pressure drop and high purification performance.
Although GPF can collect PM, Ash derived from the engine oil component accumulates and there is a problem in that the pressure drop increases. As the pressure drop increases, engine power reduction and movement of GPF will occur, so it is necessary to reduce the pressure drop from Ash accumulation.
In order to clarify the pressure drop increase mechanism by Ash accumulation, we developed the equipment to simply accumulate simulated Ash. Using that equipment, we clarified that the pressure drop increase by Ash accumulation of coated GPF is divided into the initial / mid / late regions, and that trend changes with GPF volume. From this mechanism, we set the GPF volume which does not lead to movement of GPF even in the maximum Ash amount.
This TWC + coated GPF system was applied to the European mass production model in 2018.


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