A diesel particulate filter (14) which traps particulate matter and a NOx trap catalyst (13) which traps nitrogen oxides are installed in series in an exhaust passage (10) of a diesel engine (1). A controller (21) calculates a particulate matter deposition amount in the diesel particulate filter (14)...http://www.google.fr/patents/US7631493?utm_source=gb-gplus-shareBrevet US7631493 - Exhaust gas purification control of diesel engine
