Exhaust Manifold Pressure Estimation on a Turbocharged SI-engine with Wastegate
In turbocharged engines with wastegate the exhaust pressure can change
rapidly. A method to estimate the exhaust manifold pressure is
presented for diagnosis of wastegate and turbocharger on spark-ignited
engines. It does not require any extra sensors in the exhaust system
after the calibration. A non-linear model is developed of the exhaust
pressure. Estimates of the exhaust manifold pressure relies on
information from an air-to-cylinder observer and a static map of
stationary exhaust pressure. The exhaust manifold pressure estimator
is validated using a series of wastegate steps on a turbocharged SAAB
2.3 dm^3 SI-engine. The exhaust pressure estimation is designed for
steady-state conditions and the validation shows that it works well
and converges within 1 to 4 seconds.
Per Andersson and Lars Eriksson
Elsevier Science,
2001
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