Exhaust gas purifying filter
AssigneeDenso Corporation
InventorsMikio Ishihara, Mamoru Nishimura, Makoto Saito
Life of this patent
Estimating the term…
Abstract
An exhaust gas purifying filter employs plugs that can be used as part of filter. The exhaust gas purifying filter has a honeycomb structure including a multitude of cells each surrounded by walls. Each of the cells is stopped with a plug on one end and the walls and the plugs are all made of a porous material. The value of M=(L/t)×(P1/P2) is in a range of 10<M<90, where P1 is the porosity of the walls, P 2 is the porosity of plugs, t is mean thickness of the walls and L is mean length of the plugs.
Claims8
An exhaust gas purifying filter comprising:
- a honeycomb structure having a multitude of cells each surrounded by walls and stopped with a plug on one end thereof,
- wherein said walls and said plugs are substantially all made of a porous material and the value of M=(L/t)×(P1/P2) is in a range of 10<M<90, where P1 is the porosity of said walls, P2 is the porosity of said plugs, t is mean thickness of said walls and L is mean length of said plugs.
An exhaust gas purifying filter comprising:
- a honeycomb structure having a multitude of cells each surrounded by walls and stopped with a plug on one end thereof,
- wherein said walls and said plugs are substantially all made of a porous material, and at least 50% of said plugs have values of M2=(L2/t)×(P1/P2) in a range of 10<M2<90, where P1 is the porosity of said walls, P2 is the porosity of said plugs, t is mean thickness of said walls and L2 is the length of each of said plugs.
An exhaust gas purifying filter comprising:
- a honeycomb structure comprising a multitude of cells each surrounded by walls,
- each of said cells being stopped by a plug on one end thereof,
- wherein said walls and said plugs are substantially all made of porous material,
- said walls and said plugs being provided with a catalyst supported thereon for burning the particulate matter that has been captured,
- at least 50% of the plugs having values of M2=(L2/t)×(P1/P2) in a range of 13<M2<90, where P1 is the porosity of said walls, P2 is the porosity of said plugs, t is mean thickness of said walls and L2 is the length of each of said plugs, and
- the mean length of said plugs being 5 mm or less.
Dependencies are inferred from the claim text.