Linköping University

Abstract

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Enthalpy Based Boost Pressure Control

A turbo system is driven by the excess energy in the exhaust gases. As a result, variation in exhaust temperature cause variations in boost pressure. By using the information about the available exhaust energy in the turbo controller directly through a feedforward controller, an unexpected variation in turbo boost can be avoided. A model based controller is developed that calculates the desired turbine power from the boost pressure reference and then, by observing the available exhaust energy, controls the generated turbine power to match the desired power. A Mean Value Engine Model has been used to make simulation with the developed controller implemented. Steps between different boost pressure references are used to evaluate controller performance. Tests in a car have also been made to make sure the simulation results are consistent in a real environment.

Emil Hilding

2011

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Last updated: 2021-11-10