1. Engine EGR Valve Modeling and Switched LPV Control Considering Nonlinear Dry Friction.
- Author
-
Qu, Shen, He, Tianyi, and Zhu, Guoming G.
- Abstract
Exhaust gas recirculation valves used in internal combustion engines are highly nonlinear due to its nonlinear mechanism and dry friction dominated at low valve speed that could lead to large steady-state displacement errors. A multiple friction factor model is adopted in this article using a switched linear parameter-varying (LPV) modeling approach, where the scheduling parameter is the friction coefficient as a function of valve speed. Switched gain-scheduling LPV controllers are designed based on the hysteresis switching logic with guaranteed ${\mathscr{H}}_{\infty }$ performance, where parameterized linear matrix inequality (LMI) conditions are relaxed to a set of LMI conditions for synthesizing the switched LPV controllers by convex optimization. The LPV control performance is compared with that of proportional–integral–derivative controllers through both simulation and experimental studies, showing a notable improvement in the system response performance and robustness. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF