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Control method for turbocharged diesel engines having exhaust gas recirculation

United States Patent

March 14, 2000
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of controlling the airflow into a compression ignition engine having an EGR and a VGT. The control strategy includes the steps of generating desired EGR and VGT turbine mass flow rates as a function of the desired and measured compressor mass airflow values and exhaust manifold pressure values. The desired compressor mass airflow and exhaust manifold pressure values are generated as a function of the operator-requested fueling rate and engine speed. The EGR and VGT turbine mass flow rates are then inverted to corresponding EGR and VGT actuator positions to achieve the desired compressor mass airflow rate and exhaust manifold pressure. The control strategy also includes a method of estimating the intake manifold pressure used in generating the EGR valve and VGT turbine positions.
Kolmanovsky; Ilya V. (Ypsilanti, MI), Jankovic; Mrdjan J (Birmingham, MI), Jankovic; Miroslava (Birmingham, MI)
Ford Global Technologies, Inc. (Dearborn, MI)
09/ 237,332
January 26, 1999
This invention was made with Government support under Contract Nos. ZCB-4-13032-0Z, DOE-MRI, DE-AC30-83CH10093 DOE awarded by the U.S. Department of Energy. The government has certain rights in the invention.