Model-Based Control of Two-Stage Turbochargers for Heavy-Duty Diesel Engines
The concept of downsizing has proved to be a succesful method to improve engine
efficiency. The engine key component is the turbocharging system that use excess
energy in the exhaust gases to compress air into the cylinder. There are different
types of supercharging systems, in the thesis a serial turbo system is modeled
together with a complete six cylinder engine. A model-based controller is developed
that regulates the intake pressure to a certain reference. The controller operates
in modes that are defined by the engine operating point. To control the turbochargers
it is necessary to have knowledge about the energy in the exhaust gases. A dynamic
temperature model has therefore been analyzed, which has led to surprising results
regarding the temperature measurements made in the test cells. This is analyzed and
improvements are suggested. The engine model is validated and the system, including
controller, is evaluated in certain simulations. The serial turbo concept is
compared to a VGT turbo system, which gives a hint of the possible advantages of
serial turbo charging.
Svante Löthgren
2014
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