Modeling Of A Diesel Engine With A - (Tech Report 98-002)

Modeling Of A Diesel Engine With A - (Tech Report 98-002) -...

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Modeling of a Diesel Engine with a Variable Geometry Turbine Jonas Fredriksson Control Engineering Laboratory Department of Signals and Systems Chalmers University of Technology The objective of this report is to describe an engine model developed for use in the Integrated Powertrain Control project. The engine modeled is a heavy duty diesel engine with a variable geometry turbine. The model is compounded by several submodels, each subsystem is modeled based on physical laws and empirical data. The engine model developed is a nonlinear model with three state variables, the engine speed, the boost pressure and the turbo speed. The engine model responds to changes in four input signals, the injected fuel amount, the timing for start of fuel injection, the setting of the turbine vanes and the engine brake (exhaust gas brake and decompression brake). The different submodels are implemented in DYMOLA and combined into a turbocharged diesel engine. 1. INTRODUCTION There is a significant potential in applying modern control theory in order to improve the functionality of next generation’s vehicles. Today the controller for the powertrain is divided into two different controllers, one for the engine and one for the transmission. The communication between the controllers is limited. The aim of applying modern control techniques to the powertrain is to integrate the control of the engine and the transmission. With such a controller it is possible to improve gearshift quality and decrease powertrain oscillations, i.e. improve driveability. As a first step toward integrated powertrain control, the involved systems, the engine and the transmission, needs to be studied. This report concerns modeling of the first part, the engine. The purpose of this work is to describe how a turbocharged diesel engine works and how the engine model has been developed. To get a better understanding of the turbocharged diesel engine process a short description follows. The turbo concept includes a turbine and a compressor. In the turbine, fluid power is transformed into mechanical power and transferred to the compressor via a shaft. The fresh air, that enters the engine, is compressed in the compressor. The compressed air is transferred to the intercooler, where it is cooled. The airflow continues through the intake manifold to the combustion chamber. In the combustion chamber the air is mixed with fuel, and under high pressure the air fuel
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2 mixture is burned. During the combustion the air fuel mixture expands, which produces the torque on the crankshaft. After the combustion chamber the exhaust gas is transferred through the exhaust manifold to the turbine. The turbine used in this case has a variable swallowing capacity, it’s capacity can be varied trough the position of the inlet flow vanes. After the turbine the exhaust gases are passed on to the exhaust system.
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This note was uploaded on 05/05/2011 for the course FC gj, taught by Professor Glokgh during the Spring '97 term at Punjab Engineering College.

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Modeling Of A Diesel Engine With A - (Tech Report 98-002) -...

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