Development of new coating technology optimized for each function of coated GPF

Paper #:
  • 2017-01-0929

Published:
  • 2017-03-28
Abstract:
PN regulation including Euro6 will be scheduled / tightened worldwide for gasoline engine especially GDI(Gasoline Direct Injection) engine. To meet PN regulation with GDI engine, particle filter which is also utilized for a diesel engine is needed. There are two types of particle filters for gasoline engine (Gasoline Particulate Filter ; GPF). One is bare GPF (additional type) , the other is coated GPF (replaced type). "Replaced" GPF (coated GPF) has advantages of cost / space / pressure drop compare to “Additional" GPF (bare GPF). There are three key performances for coated GPF. Firstly, three way performance is equivalent or more than three way catalyst. Secondly, a low pressure drop which is not to affect engine power and fuel consumption. Finally, a high PN filtration efficiency to meet the PN regulations. ZONE coating technology which is utilized for three way catalyst is also effective for GPF to improve three way performance. By controlling the precious group metal configuration or coating length, we can optimize three way performance of GPF. Since GPF is used at higher temperature than diesel engine, and the amount of PM is less than diesel engine, GPF coated in the wall is effective to reduce the pressure drop. Also, it was found that deep coating in the wall has larger pores and lower pressure drop. On the other hand, GPF coated on the wall improved PN filtration efficiency. This technology is utilized for GPF as well. We can optimize GPF performance by the combination of these coating technologies.
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