Air-to-Cylinder Observer on a Turbocharged SI-Engine with Wastegate
Observers for air mass flow to the cylinder is studied on a turbocharged
SI-engine with wastegate. A position change of the wastegate influences the
residual gas mass and causes the volumetric efficiency to change, which produces
a transient in the air mass flow to the cylinder. Two standard methods of
estimating air-to-cylinder are investigated. A new nonlinear air-to-cylinder
observer is suggested with two states: one for intake manifold pressure and one
for the offset in in-cylinder air mass compared to expected through the
volumetric efficiency. The observers are validated on intake manifold pressure
data from a turbocharged spark ignited production engine with wastegate.
Per Andersson and Lars Eriksson
2001
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