| 摘要 |
A diesel engine system comprises a particulate filter (13) interposed in the exhaust line (9) of the engine, and a plurality of fuel injectors (2) associated with the cylinders of the engine. When a quantity of particulate accumulated within said filter is estimated to be greater than a threshold value, a control mode of the injectors (2) is activated which causes an automatic regeneration of the filter (13), by means of an increase of the temperature of the exhaust gases fed to the filter (13) which is sufficient for burning the particulate within the filter (13). A statistical model (S.M.) is applied which estimates the quantity of particulate accumulated in the filter (13) per time unit (soot-loading) on the basis of the operative conditions of the engine and the motor-vehicle (M.P.). The system comprises a sensor (T6) for sensing the temperature of the exhaust gases at the exit from the particulate filter. The above mentioned estimation of the particulate accumulated in the filter (soot-loading) is corrected after each regeneration of the filter, on the basis of a comparison between the real variation of said temperature during the regeneration as detected in the real case by said sensor (T6) and a stored reference variation (T6mod) of said temperature previously detected empirically during a regeneration with the filter (13) being empty, i.e. without particulate accumulated therein. |
