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1	Dynamic modeling and feedback control with mode-shifting of a two-mode electrically variable transmission Katariya, Ashish Santosh 31 August 2012 (has links) This thesis develops dynamic models for the two-mode FWD EVT, develops a control system based on those models that is capable of meeting driver torque demands and performing synchronous mode shifts between different EVT modes while also accommodating preferred engine operating points. The two-input two-output transmission controller proposed herein incorporates motor-generator dynamics, is based on a general state-space integral control structure, and has feedback gains determined using linear quadratic regulator (LQR) optimization. Dynamic modeling of the vehicle is categorized as dynamic modeling of the mechanical and electrical subsystems where the mechanical subsystem consists of the planetary gear sets, the transmission and the engine whereas the electrical subsystem consists of the motor-generator units and the battery pack. A discussion of load torque is also considered as part of the mechanical subsystem. With the help of these derived dynamic models, a distinction is made between dynamic output torque and steady-state output torque. The overall control system consisting of multiple subsystems such as the human driver, power management unit (PMU), friction brakes, combustion engine, transmission control unit (TCU) and motor-generator units is designed. The logic for synchronous mode shifts between different EVT modes is also detailed as part of the control system design. Finally, the thesis presents results for responses in individual operating modes, EVT mode shifting and a full UDDS drive cycle simulation. Hybrid electric vehicles EVT-2 EVT-1 Two-mode EVT Output torque Motor-generator units Battery pack Supervisory controller Transmission control Planetary gear sets Transmission Engine Load torque Power balance Powertrain Power management UDDS Synchronous mode shifting Drive cycle Simulations LQR Hybrid electric cars Prius automobile

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Dynamic modeling and feedback control with mode-shifting of a two-mode electrically variable transmission