Modeling and control of advanced technology engines.

Modeling and Control of Advanced Technology Engines by Anna Stefanopoulou Co-Chairs: Jessy W. Grizzle and James S. Freudenberg Over the last two decades there has been a dramatic evolution in powertrain control systems, largely driven by government regulations aimed at improving fuel economy and reducing emissions. One way to potentially meet these performance requirements is to introduce additional design parameters via innovative mechanical con gurations (new actuators). The design parameters, control variables in system terminology, provide additional degrees of freedom to optimize the performance of the engine over its wide range of operation. In this dissertation, we study control design issues for two advanced technology engines: (i) a spark-ignition (SI) engine with secondary throttles placed in the intake ports of the cylinders, and (ii) an SI engine equipped with a variable cam timing (VCT) mechanism. Both engine con gurations are multivariable and nonlinear, thus imposing challenging control problems associated with control authority, long sensor delays, and strongly coupled subsystems. We develop and validate dynamic engine models, study the subsystem interactions, identify performance tradeo s, and apply classical and modern control techniques to improve engine performance. Moreover, we study the impact of modular controller architecture on the engine dynamic response, and demonstrate that even if the controller is eventually implemented in independent software modules, coordinating the design and analysis allows for a better assessment of the tradeo s among the dynamic performance of di erent subsystems. Our results demonstrate the advantages of a systematic approach to developing advanced technology powertrain control systems. c Anna Stefanopoulou 1996 All Rights Reserved Dedicated to George, Kaite, and Dolly.

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