Abstract:
PURPOSE: A method for diagnosis of deterioration of a particulate filter is provided to accurately measure deterioration of a particulate filter by spraying the fuel after regenerating the particulate filter. CONSTITUTION: A method for diagnosis of deterioration of a particulate filter coated with an oxidation catalyst is as follows. The deterioration of a particulate filter is diagnosed by calculating the heating efficiency because the fuel is sprayed after the particulate filter is completely regenerated(S220,S270,S230). A complete regeneration step of the particulate filter repetitively operates on a periodic basis. The fuel is sprayed when a set up time passes after the particulate filter is completely regenerated.
Abstract:
An unevenly catalyst distributed multilayer filter is provided to obtain an effect that is capable of excluding the use of a diesel oxidation catalyst by adding porous ceramic particles coated with a catalyst to a multilayer filter. In a multilayer filter mounted on an exhaust system to purify exhaust gas generated from an engine, an unevenly catalyst distributed multilayer filter is characterized in that a multilayer filter formed by coating a catalyst on a metal foam plate mesh(22) is mounted between inner and outer housings of a filter part. The metal foam plate mesh of the multilayer filter is formed such that the metal foam plate mesh has pores with different sizes formed therein. The metal foam plate mesh of the multilayer filter is formed such that pores having pore sizes of 800, 500 and 450 mum are formed from a region corresponding to 25% of the diameter direction to a region corresponding to 75% of the diameter direction in the metal foam plate mesh.
Abstract:
본 발명에 의한 매연저감장치는, 복수개의 촉매담체를 구비하며, 전체 촉매담체 내부를 지나는 배기가스의 평균유속보다 빠르게 배기가스가 내부를 지나는 촉매담체에는 설정량 이상의 촉매물질을 담지시키고, 전체 촉매담체를 지나는 배기가스의 평균유속보다 느리게 배기가스가 내부를 지나는 촉매담체에는 설정량 미만의 촉매물질을 담지시키도록 구성된다. 본 발명에 의한 매연저감장치는, 배기가스의 유속이 빠르고 온도가 높은 담체에는 많은 양의 촉매물질을 담지시키고 배기가스의 유속이 느리고 온도가 낮은 담체에는 상대적으로 적은 양의 촉매물질을 담지시킴으로써, 최소한의 촉매물질로 최대의 매연저감 효과를 얻을 수 있다는 장점이 있다. 매연, 저감, 촉매, 담체, 배기가스, 유속, 온도, 담지량
Abstract:
A multi-layered filter for a vehicle is provided to effectively purify an exhaust gas generated from a diesel engine without using a separate diesel oxide catalyst. A multi-layered filter for a vehicle includes a housing(3) and a filter(4). The housing is coupled to a burner part and has a predetermined space(2), of which both ends are opened. The filter is inserted into the space, and has a multi -layered structure formed of silicon carbide particles. The filter includes a filter material formed of ceramic alumina coated with catalyst, and silicon carbide particles. The filter includes a surface layer formed of silicon carbon particles, and the other layer formed of a filter material including ceramic alumina coated with catalyst, and silicon carbide particles.