| Abstract: | Although the modern torque converter (TC) has many functions, this paper focuses on its ability to transmit torque while allowing the engine and gearbox to slip or rotate at different speeds. While this slipping greatly improves drivetrain feel, it can also reduce driveline efficiency due to friction. To improve efficiency, modern torque converters include a bypass Torque Converter Clutch (TCC), which allows the slipping to be reduced or eliminated at various operating conditions. This paper will investigate how to apply Piecewise Linearization to the plant model, so it can be controlled by switched gain controllers. These controllers are tuned by both Lyapunov and Riccati methods, and their performance evaluated against the conventional PID controlled model in terms of settling time, response and performance robustness.
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