초록 ▼

A method to estimate real-time exhaust pressure in a compression ignition engine with variable geometry turbocharger and an EGR by adding the turbocharger RPM, the engine RPM, EGR value position and intake manifold pressure to determine a final turbocharger turbine inlet pressure to control NOx emis

A method to estimate real-time exhaust pressure in a compression ignition engine with variable geometry turbocharger and an EGR by adding the turbocharger RPM, the engine RPM, EGR value position and intake manifold pressure to determine a final turbocharger turbine inlet pressure to control NOx emissions.

대표청구항 ▼

We claim: 1. A method to estimate real time exhaust pressure in an internal combustion engine with an exhaust gas recirculation system (EGR), an ECM with memory and a variable Geometry turbocharger (VGT) with an inlet, to control EGR flow rate and combustion emissions, comprising: determining VGT t

We claim: 1. A method to estimate real time exhaust pressure in an internal combustion engine with an exhaust gas recirculation system (EGR), an ECM with memory and a variable Geometry turbocharger (VGT) with an inlet, to control EGR flow rate and combustion emissions, comprising: determining VGT turbocharger vane position; determining engine RPM; determining engine load; determining EGR valve position; determining intake manifold temperature; determining turbocharger RPM; and using the above six variables as inputs to three two-dimensional tables that are summed to estimate a final turbocharger inlet pressure and to control exhaust emissions. 2. The method of claim 1, wherein turbocharger RPM, engine RPM, VGT vane position, engine load, EGR valve position and intake manifold temperature are in at least one table within memory of the ECM; said table generated according to the formula: wherein: z is the table output, x is the first input to the table, y is the second input to the table, and c1; c2; c3; c4; c5; c6; c7; c8; c9 are coefficients of the polynomial used underlying turbine inlet pressure model. 3. The method of claim 2, further including the steps of: assuming a fixed model z=a*c wherein a is the vector a=[x2, xy2, y, x2y2, xy, x2y, xy2, 1]; and solving for the coefficients of the vector c wherein c=[a'*a]-1*a'*z-. 4. The method of claim 1, wherein the exhaust emissions are NOx. 5. The method of claim 1, wherein EGR valve position is measured as a function of percent the EGR valve is open.