Exhaust Manifold Pressure Estimation on a Turbocharged Si-engine with Wastegate
نویسندگان
چکیده
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 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.
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Comparison of two Exhaust Manifold Pressure Estimation Methods
In turbocharged engines with wastegate the exhaust pressure can change rapidly. Two methods to estimate the exhaust manifold pressure are compared for diagnosis of wastegate and turbocharger of a spark-ignited engine. One relies on the first law of thermodynamics and produces changes in exhaust manifold pressure. The second uses a model of the mass of remaining exhaust gases in the cylinder and...
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