| abstract |
A diesel engine comprising an exhaust system comprises: a particulate filter made from a porous material having a mean pore diameter of from 5 µm to 40 µm, and a porosity of at least 40 % and a bulk volumetric heat capacity of at least 0.50 J cm-3 K-1 at 500°C, which filter comprising a diesel oxidation catalyst located in a zone on the front end of the filter for oxidising carbon monoxide, hydrocarbons and nitrogen monoxide, the engine comprising engine management means, in use, to provide continuously or intermittently an exhaust gas comprising sufficient nitrogen oxides or hydrocarbon and/or an exhaust gas of sufficiently high temperature to combust particulate matter in the filter. |