Young Ok Lee

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A multirate steering control scheme is developed for autonomous vehicle lateral maneuvering. The proposed scheme consists of a multirate extended Kalman filter and a state feedback control. The multirate extended Kalman filter is to estimate the vehicle states at a fast rate of the car ECU using multirate sensing - a slow vision-based lane detection by a(More)
A proximate model predictive control strategy is proposed for autonomous vehicle lateral control, which substantially reduces iteration in on-line optimization. Nodal state vectors are generated in the feasible state space, for which the quadratic optimization problem is solved off-line. Vertices are determined to represent a given state as an interpolation(More)
Unknown and uncertain disturbance significantly affects the performance of a active steering control such as lane keeping and lane changing control. Such performance degradation is here considered to be due to input equivalent disturbance that is to be compensated by the state space disturbance observer we are to design. In contrast to some existing methods(More)
In this paper, we present a novel control method with clamping force estimation for an electric parking brake system. This simple control structure can be implemented at low cost as it does not require a clamping force sensor. The characteristic curve is conventionally used to estimate the clamping force through the angular displacement of the DC motor;(More)
In this paper, we present how model predictive control (MPC) is applied to a lane keeping system and how realtime solution is calculated. In the case of fast systems, real-time solution is very difficult to calculate in the sample time because the system has complex formulation and many constraints. The two proposed methods such as proximate MPC and fast(More)
Due to increasing of the wind power penetration in power systems, centralized control for a wind farm is needed to connect to the grid. This paper describes an optimal unit commitment problem, which is a part of wind farm centralized control that schedules the wind turbines of wind farm to satisfy the demand power from transmission system operator. Four(More)