APPARATUS AND METHOD FOR ENGINE BACKPRESSURE REDUCTION

摘要

An improved catalytic substrate for use with a can in an automotive exhaust system, the substrate being of the type which is disposed in use in the can, the improvement comprising: an insulation material thermally separating the substrate into a central zone and a tubular outer zone surrounding the central zone, the insulation material, central zone and outer zone collectively defining a modified substrate, the insulation material being adapted such that, in an operating condition, the temperature difference across the insulation material is at least 25° C.

主权项

1. An improved catalytic substrate for use with a can in an automotive exhaust system, the substrate being of the type which is disposed in use in the can, the improvement comprising:
an insulation material thermally separating the substrate into a central zone and an outer zone surrounding the central zone, the insulation material, central zone and outer zone collectively defining a modified substrate, the insulation material being adapted such that, in an operating condition, the gas flow through the modified substrate is characterized by a static pressure that, on the upstream-facing surface of the modified substrate,
has a peak at a point generally central to the upstream-facing surface of the modified substrateas the upstream-facing surface extends radially away from the point to the periphery, decreases, but for
a surge, after the upstream-facing surface extends beyond the insulation material; andedge effects associated with the can.