Patent ID: 7353648
Filing Date: 2008-04-08
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. A method for counteracting the effect of soot accumulation in a diesel particulate filter (DPF) in an exhaust system of a diesel engine on the control of exhaust gas recirculation (EGR) through an EGR system of the engine by a control system of the engine, the method comprising: in the control system, a) processing certain data to select a data value for present EGR volumetric efficiency that is based on a predetermined relationship between certain parameters associated with operation of the engine, b) processing the selected data value for present EGR volumetric efficiency and certain other data, including data that accounts for present soot accumulation in the DPF, to develop a data value indicative of present total mass flow through the engine during engine operation, and c) processing the data value indicative of present total mass flow through the engine and still other data to develop flow control data for controlling flow of exhaust gas through the EGR system, and in the EGR system, using the flow control data for controlling flow of exhaust gas.