Yildiray Yildiz | Bilkent University (original) (raw)
Address: Huntsville, Alabama, United States
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Papers by Yildiray Yildiz
IEEE Transactions on Control Systems Technology, 2011
The paper presents an application of a recently developed adaptive posicast controller (APC) for ... more The paper presents an application of a recently developed adaptive posicast controller (APC) for time-delay systems to the idle speed control (ISC) problem in spark ignition (SI) internal combustion (IC) engines. The objective is to regulate the engine speed to a prescribed set-point in the presence of accessory load torque disturbances such as those due to air conditioning and power steering. The adaptive controller, integrated with the existing proportional spark controller, is used to drive the electronic throttle actuator. We present both simulation and experimental results demonstrating the performance improvement by employing the adaptive controller. We also present the modifications and improvements to the controller structure which were developed during the course of experimentation to solve specific problems. In addition, the potential for the reduction in calibration time and effort which can be achieved with our approach is discussed.
This paper treats the control of engine air-to-fuel ratio from the perspective of adaptive contro... more This paper treats the control of engine air-to-fuel ratio from the perspective of adaptive control of time-delay systems. High accuracy of engine air-to-fuel ratio control is required to meet stringent emissions regulations. Two adaptive controller designs are considered. The first design is based on feed-forward adaptation while the second design is based on both feedback and feedforward adaptation incorporating the developed adaptive posicast controller. The two adaptive designs are compared with the baseline controller using simulations and vehicle experiments.
Control Engineering Practice, 2010
The paper presents an application of a recently developed adaptive posicast controller for time-d... more The paper presents an application of a recently developed adaptive posicast controller for time-delay systems to the idle speed control (ISC) problem in internal combustion (IC) engines. The objective is to regulate the engine speed at a prescribed set-point in the presence of accessory load torque disturbances such as air conditioning and power steering. The adaptive controller, integrated with the existing proportional spark controller, is used to drive the electronic throttle as an actuator. We present both simulation and experimental results which demonstrate the potential of the adaptive controller to improve the performance. In addition, the reduction in calibration time and effort which can be achieved with our approach is discussed.
IEEE Industrial Electronics Magazine, 2007
In this paper, the previously proposed neuro-sliding mode controller for SISO systems by the auth... more In this paper, the previously proposed neuro-sliding mode controller for SISO systems by the authors is modified for MIMO case. The structure benefits from the power of sliding mode control and nonlinear function approximation ability of the neural networks. The controller is a two layer feed-forward neural network and weight updates are done using backpropagation algorithm. The error function that is introduced to the neural network is such that the states of the system are restricted to belong to a certain manifold in state space. Different from the works done until now, in this work the aim is not calculating the equivalent control but instead finding the control input by just minimizing a certain error function. Simulation results demonstrate the performance of the controller.
IEEE Transactions on Control Systems Technology, 2011
The paper presents an application of a recently developed adaptive posicast controller (APC) for ... more The paper presents an application of a recently developed adaptive posicast controller (APC) for time-delay systems to the idle speed control (ISC) problem in spark ignition (SI) internal combustion (IC) engines. The objective is to regulate the engine speed to a prescribed set-point in the presence of accessory load torque disturbances such as those due to air conditioning and power steering. The adaptive controller, integrated with the existing proportional spark controller, is used to drive the electronic throttle actuator. We present both simulation and experimental results demonstrating the performance improvement by employing the adaptive controller. We also present the modifications and improvements to the controller structure which were developed during the course of experimentation to solve specific problems. In addition, the potential for the reduction in calibration time and effort which can be achieved with our approach is discussed.
This paper treats the control of engine air-to-fuel ratio from the perspective of adaptive contro... more This paper treats the control of engine air-to-fuel ratio from the perspective of adaptive control of time-delay systems. High accuracy of engine air-to-fuel ratio control is required to meet stringent emissions regulations. Two adaptive controller designs are considered. The first design is based on feed-forward adaptation while the second design is based on both feedback and feedforward adaptation incorporating the developed adaptive posicast controller. The two adaptive designs are compared with the baseline controller using simulations and vehicle experiments.
Control Engineering Practice, 2010
The paper presents an application of a recently developed adaptive posicast controller for time-d... more The paper presents an application of a recently developed adaptive posicast controller for time-delay systems to the idle speed control (ISC) problem in internal combustion (IC) engines. The objective is to regulate the engine speed at a prescribed set-point in the presence of accessory load torque disturbances such as air conditioning and power steering. The adaptive controller, integrated with the existing proportional spark controller, is used to drive the electronic throttle as an actuator. We present both simulation and experimental results which demonstrate the potential of the adaptive controller to improve the performance. In addition, the reduction in calibration time and effort which can be achieved with our approach is discussed.
IEEE Industrial Electronics Magazine, 2007
In this paper, the previously proposed neuro-sliding mode controller for SISO systems by the auth... more In this paper, the previously proposed neuro-sliding mode controller for SISO systems by the authors is modified for MIMO case. The structure benefits from the power of sliding mode control and nonlinear function approximation ability of the neural networks. The controller is a two layer feed-forward neural network and weight updates are done using backpropagation algorithm. The error function that is introduced to the neural network is such that the states of the system are restricted to belong to a certain manifold in state space. Different from the works done until now, in this work the aim is not calculating the equivalent control but instead finding the control input by just minimizing a certain error function. Simulation results demonstrate the performance of the controller.