Abstract: An exhaust system for reducing particulate and NO2 emissions from diesel engine exhaust gases. The exhaust system includes a diesel particulate filter, an inlet for receiving the exhaust gases, a first conduit for providing a first fluid connection between the inlet and the diesel particulate filter, and a second conduit for providing a second fluid connection between the inlet and the diesel particulate filter. The exhaust system also includes a diesel oxidation catalyst in the second conduit for catalysing hydrocarbon combustion and the formation of NO2 and having high I-IC activity and high NO2 activity, and a fuel injector for injecting fuel upstream of the diesel oxidation catalyst. A valve mechanism for selectively directing exhaust gases from the inlet to the diesel particulate filter through the first conduit or the second conduit is also included. A method for reducing particulate and NO2 emissions using the exhaust system is also provided.

Abstract: A method for cleaning a vehicle exhaust system filter including a plurality of generally parallel elongate channels comprises introducing liquid into the elongate channels for absorption by particulate matter present in the channels, and rotating the filter such that the rotation causes the wetted particulate matter to move along, and out of, the elongate channels to thereby clean the filter.

Abstract: The present invention relates to a gas treatment apparatus for treating the exhaust gas stream from an internal combustion engine. The apparatus comprises several compartments within which one or more treatments are to be performed upon a gas flowing through the compartments. At least one compartment includes a treatment element secured against axial movement at each end. The treatment element is secured at least at one end by removable axial retaining apparatus. The removable axial retaining apparatus includes a secured member secured against axial movement. The treatment element is removable from within the compartment by axial movement after the removable axial retaining apparatus has been removed.

Abstract: The invention relates to a gas treatment apparatus (1) for treating a gas stream. The gas treatment apparatus (1) comprising addition means (14) for adding a reducing agent (12) to a gas stream passing through the apparatus (1), a guide chamber (8), a mixing conduit (18) and a catalytic treatment chamber (16) containing a catalytic treatment element (20). The apparatus (1) is arranged such that gas must pass through the mixing conduit (18) to pass from the guide chamber (8) to the catalytic treatment chamber (16). The mixing conduit (18) includes an outer wall (22) surrounding a mixing axis (20) within the guide chamber (8). The outer wall (22) including at least one aperture (30) through which a gas can enter the mixing conduit (18) from the guide chamber (8).

Abstract: The present invention relates to a gas treatment apparatus for treating the exhaust gas stream from an internal combustion engine. The apparatus comprises several compartments within which one or more treatments are to be performed upon a gas flowing through the compartments. At least one compartment includes a treatment element secured against axial movement at each end. The treatment element is secured at least at one end by removable axial retaining apparatus. The removable axial retaining apparatus includes a secured member secured against axial movement. The treatment element is removable from within the compartment by axial movement after the removable axial retaining apparatus has been removed.