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Zaragoza, Spain

Paesa D.,University of Zaragoza | Franco C.,University of Zaragoza | Llorente S.,BSH Home Appliances Group | Llorente S.,University of Zaragoza | And 2 more authors.
IEEE Transactions on Industry Applications | Year: 2011

The goal of this paper is twofold. First, we aim at investigating the potentials of reset observers (ReOs) applied to process control. Second, we aim to overcome the existing performance limitations of the temperature control in domestic cookers. To this end, we present an adaptive simmering control for induction cookers, whose parameters are updated online, depending on the estimates provided by a multiple-model ReO (MMReO). This new observer results in extending the idea of multiple models to the state observer framework. The MMReO consists of a reinitialized ReO and of multiple fixed identification models. The resultant control scheme satisfies the user requirements such as quick heating up, accurate temperature control, and fast disturbance rejection, outperforming previous results. Moreover, the proposed control scheme reduces energy consumption, and consequently, it can increase the efficiency of the whole cooking process. Additionally, a fixed robust quantitative feedback theory (QFT)-based controller is designed, and it is also used for comparison purposes. Several verification tests are carried out in real induction hobs to emphasize the effectiveness of our proposal compared with the QFT-based controller. © 2011 IEEE.


Sanz F.,University of Zaragoza | Sagues C.,University of Zaragoza | Llorente S.,BSH Home Appliances Group
2014 IEEE Industry Application Society Annual Meeting, IAS 2014 | Year: 2014

An induction heating appliance designed to uniformly heat up metallic plates is studied in this work. It consists of one planar inductor with two concentric coils attached to a mechanism, which allows moving the inductor under the plate while heating. This system is a possible solution for the growing concept of flexible induction cooking hobs, improving their performance in flexibility and in thermal distribution in the pans. With different combinations of motion and the selective activation of the inductor coils, any pan can be uniformly heated regardless its size or position on the hob. In this paper we develop a thermal model to analyze the temperature distribution obtained in the pans for each diameter and strategy used. The model is solved using finite differences and it is validated with experimental measurements. From the calculations, the best strategy for each pan diameter is obtained. © 2014 IEEE.


Franco C.,University of Zaragoza | Lopez-Nicolas G.,University of Zaragoza | Sagues C.,University of Zaragoza | Llorente S.,BSH Home Appliances Group
Asian Journal of Control | Year: 2015

Persistent coverage with a team of agents refers to the task of covering an area where the coverage degrades with time. This is a dynamic task as opposed to the deployment problem. A key issue here is the coverage degradation that prevents the complete coverage fulfilment and requires persistence in the action. We propose a new method for persistent coverage where the agents' actions are computed in a partially distributed manner. The contribution is a control strategy based on variable coverage action and variable coverage range of the agents. This control provides adaptive behaviour in terms of actuator power and actuator domain in order to reduce the coverage error and energy consumption. The proposal is tested in simulation, showing clear improvement in terms of efficiency, flexibility, and scalability. © 2015 Chinese Automatic Control Society and Wiley Publishing Asia Pty Ltd.


Sanz-Serrano F.,University of Zaragoza | Sagues C.,University of Zaragoza | Llorente S.,BSH Home Appliances Group
IEEE Industry Application Society - 51st Annual Meeting, IAS 2015, Conference Record | Year: 2015

In this paper, we propose a theoretical model of multiple-coil inductors supplied by resonant half-bridge inverters in induction hobs. The model includes coupling effects and allows calculating the coil currents and the inverter's output power for any modulation parameters, even with different switching frequencies and duty cycle. Furthermore, we calculate the power distribution in the pan and obtain the relationship with the output powers of the power stage, so that they can be controlled to obtain a homogeneous power distribution and a more uniform heating. © 2015 IEEE.


Ramirez-Laboreo E.,University of Zaragoza | Sagues C.,University of Zaragoza | Llorente S.,BSH Home Appliances Group
IEEE Industry Application Society - 51st Annual Meeting, IAS 2015, Conference Record | Year: 2015

In this paper, a novel multiphysics and nonlinear model for electromechanical relays is presented. The electromagnetic dynamics is analyzed by calculating the total reluctance of the magnetic equivalent circuit, which is composed of a fixed length iron core and an angular air gap. Magnetic saturation and angular dependency of the reluctance are considered in the calculation. Then, an energy balance applied to the electromagnetic components of the system is used to obtain the torque which acts on the movable armature. A planar mechanism of four rigid bodies, including spring-damping torques that restrict the motion and model the contact bounces that occur in the switchings, is proposed to explain the dynamics of the movable components. Experimental tests show the accuracy of the model both in the electromagnetic and the mechanical parts. © 2015 IEEE.

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