Multi-cell structure for automotive catalyst support
First Claim
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1. An exhaust system, comprising:
- an exhaust manifold having different length runners, the runners joining in a mixing area within the exhaust manifold; and
an emission control device housing a catalyst brick with a varying multi-cell density within the catalyst brick varying across and at a front face of the catalyst brick, cells with higher and lower density each having walls that support a coating of metal catalysts within the catalyst brick,wherein a first catalyst brick in a housing has the varying multi-cell density and a second catalyst brick in the housing has a uniform cell density.
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Abstract
An exhaust system is described including an exhaust manifold having different length runners, with an emission control device housing a plurality of catalyst bricks, at least one of which having a multi-cell density. In this way, uneven exhaust mixing may be addressed without modifying packaging of the exhaust system.
15 Citations
19 Claims
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1. An exhaust system, comprising:
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an exhaust manifold having different length runners, the runners joining in a mixing area within the exhaust manifold; and an emission control device housing a catalyst brick with a varying multi-cell density within the catalyst brick varying across and at a front face of the catalyst brick, cells with higher and lower density each having walls that support a coating of metal catalysts within the catalyst brick, wherein a first catalyst brick in a housing has the varying multi-cell density and a second catalyst brick in the housing has a uniform cell density. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An exhaust system, comprising:
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an engine having an integrated exhaust manifold having different length exhaust runners; and an emission control device housing a plurality of catalyst bricks serially positioned, with varying cell density within a catalyst brick at a front face of the catalyst brick, cells with higher and lower density each having walls that support a coating of metal catalysts within the catalyst brick at the front face of the catalyst brick, wherein the catalyst bricks are positioned linearly within the exhaust system, wherein the plurality of catalyst bricks has varying cell density, wherein the varying cell density is in a vertical direction, and wherein there is a larger variation in cell density within a vertical center region in a first catalyst brick than a second catalyst brick, while there is a larger variation in cell density within a vertical bottom region in the second catalyst brick than the first catalyst brick, wherein the vertical direction is a direction orthogonal to a longitudinal axis of the emission control device. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An exhaust system, comprising:
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an exhaust manifold having different length runners, the runners joining in a mixing area within the exhaust manifold; and an emission control device housing a catalyst brick with a varying multi-cell density within the catalyst brick varying across and at a front face of the catalyst brick, cells with higher and lower density each having walls that support a coating of metal catalysts within the catalyst brick, wherein an average cell density of a first catalyst brick differs from an average cell density of a second catalyst brick in a housing, and further comprising an exhaust gas sensor positioned between the first and second catalyst bricks. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification