| 摘要 |
A method for testing the catalytic efficiency of an exhaust component 2, e.g. a diesel particulate filter (DPF) for a heavy-duty diesel engine exhaust. The component has a plurality of elongate channels through which exhaust gases flow, the channels extending between first and second end faces 4, 6 of the component. The method comprises causing an exhaust gas (or other gas containing NOx) to flow through the component, and making measurements of a property of the gas before and after it has flowed through the component. The flow of the exhaust gas through the channels is restricted such that the volume of the component through which the exhaust gas flows is reduced compared to that when the component is in use. Apparatus for carrying out the method comprises first and second clamping means 12, 30, each comprising a sealing plate 14, 32 with an aperture 24, 40 there through. The apparatus also comprising means to urge each clamping means into contact with an end face of the component so as to define a gas flow path through the component between the apertures. |
