Exhaust Backpressure Estimation for an Internal Combustion Engine with a Variable Geometry Turbo Charger

An exhaust manifold pressure estimator for a two-stage turbocharged Diesel engine

“…Similar to the steady-state validation case, the inputs to the estimator are the thermodynamic conditions downstream the LP turbine (p 8 , T 8 ) and the exhaust gas mass flow rate. This term was computed as the sum of the air mass flow rate (MAF) and fuel mass flow rate, without considering any correction due to the intake manifold filling dynamics or the cylinder combustion delay.…”

“…Similarly, an approach for estimating the exhaust manifold pressure by means of characterizing the engine exhaust system as a restriction is presented in [7]. In [8], an algorithm for estimating the exhaust manifold pressure is presented for the case of a Diesel engine with variable geometry turbocharger.…”