ROBUST EGR CONTROL FOR COUNTERACTING EXHAUST BACK-PRESSURE FLUCTUATION ATTRIBUTABLE TO SOOT ACCUMULATION IN A DIESEL PARTICULATE FILTER

摘要

An engine (10) uses a method for counteracting the effect of soot accumulationin a diesel particulate filter (DPF 38) in a diesel engine exhaust system (16)on the control of exhaust gas recirculation (EGR) through an EGR system (40).Engine speed (N) and indicated engine torque (TQI) data are processed toselect from a map (62) a data value for present EGR volumetric efficiency. Theselected data value and certain other data, including data that accounts forpresent soot accumulation in the DPF, are processed to develop a data valueindicative of present total mass flow. The data value indicative of presenttotal mass flow and still other data are processed to develop flow controldata for controlling flow of exhaust gas through the EGR system.