Development of ceramic EHC
2022-01-0651
03/29/2022
- Content
- In recent years, electrically heated catalysts (EHCs) have been developed to reduce emissions. Among several types of heating methods of EHCs, the direct heating method, in which a current is applied to the catalyst substrate directly, makes it easy to activate the catalyst before starting the engine. The research results that emissions (HC + NOx) were reduced 76% with the direct heating EHC have been reported. In terms of catalyst support, ceramics are considered to be a better material for the substrate than metal due to the coefficient of linear thermal expansion difference between the wash coat and the substrate. However, EHCs made of ceramics have issues such as controllability of the current distribution and durability reliability of the connection between the substrate and the electrodes. This paper reports about the hardware configuration of the direct heating EHC made of ceramics, including the catalytic substrate as an electric circuit, its electrode, and the insulation structure between pipe and them, which can solve these problems.
- Citation
- Sadamitsu, T., Oki, T., Korenaga, S., Hirooka, S. et al., "Development of ceramic EHC," SAE Technical Paper 2022-01-0651, 2022, .