Subjects -> COMPUTER SCIENCE (Total: 2313 journals)
    - ANIMATION AND SIMULATION (33 journals)
    - ARTIFICIAL INTELLIGENCE (133 journals)
    - AUTOMATION AND ROBOTICS (116 journals)
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    - COMPUTER SCIENCE (1305 journals)
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    - THEORY OF COMPUTING (10 journals)

AUTOMATION AND ROBOTICS (116 journals)                     

Showing 1 - 113 of 113 Journals sorted alphabetically
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 10)
ACM Transactions on Human-Robot Interaction     Open Access   (Followers: 2)
Advanced Robotics     Hybrid Journal   (Followers: 28)
Advances in Computed Tomography     Open Access   (Followers: 2)
Advances in Image and Video Processing     Open Access   (Followers: 25)
Advances in Robotics & Automation     Open Access   (Followers: 11)
American Journal of Robotic Surgery     Full-text available via subscription   (Followers: 7)
Annual Review of Control, Robotics, and Autonomous Systems     Full-text available via subscription   (Followers: 12)
Artificial Life and Robotics     Hybrid Journal   (Followers: 17)
Augmented Human Research     Hybrid Journal  
Automated Software Engineering     Hybrid Journal   (Followers: 9)
Automatic Control and Information Sciences     Open Access   (Followers: 4)
Automation and Remote Control     Hybrid Journal   (Followers: 5)
Autonomous Agents and Multi-Agent Systems     Hybrid Journal   (Followers: 9)
Autonomous Robots     Hybrid Journal   (Followers: 11)
Biocybernetics and Biological Engineering     Full-text available via subscription   (Followers: 4)
Biological Cybernetics     Hybrid Journal   (Followers: 10)
Biomimetic Intelligence and Robotics     Open Access  
Cognitive Robotics     Open Access   (Followers: 5)
Computational Intelligence and Neuroscience     Open Access   (Followers: 18)
Computer-Aided Design     Hybrid Journal   (Followers: 8)
Construction Robotics     Hybrid Journal   (Followers: 4)
Current Robotics Reports     Hybrid Journal   (Followers: 4)
Cybernetics & Human Knowing     Full-text available via subscription   (Followers: 3)
Cybernetics and Systems Analysis     Hybrid Journal  
Cybernetics and Systems: An International Journal     Hybrid Journal   (Followers: 1)
Design Automation for Embedded Systems     Hybrid Journal   (Followers: 7)
Digital Zone : Jurnal Teknologi Informasi Dan Komunikasi     Open Access  
Drone Systems and Applications     Open Access   (Followers: 1)
Electrical Engineering and Automation     Open Access   (Followers: 9)
Facta Universitatis, Series : Automatic Control and Robotics     Open Access   (Followers: 1)
Foundations and Trends® in Robotics     Full-text available via subscription   (Followers: 5)
Frontiers in Neurorobotics     Open Access   (Followers: 6)
Frontiers in Robotics and AI     Open Access   (Followers: 8)
GIScience & Remote Sensing     Open Access   (Followers: 57)
IAES International Journal of Robotics and Automation     Open Access   (Followers: 5)
IEEE Robotics & Automation Magazine     Full-text available via subscription   (Followers: 70)
IEEE Robotics and Automation Letters     Hybrid Journal   (Followers: 9)
IEEE Transactions on Affective Computing     Hybrid Journal   (Followers: 23)
IEEE Transactions on Audio, Speech, and Language Processing     Hybrid Journal   (Followers: 17)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 70)
IEEE Transactions on Cybernetics     Hybrid Journal   (Followers: 16)
IEEE Transactions on Intelligent Vehicles     Hybrid Journal   (Followers: 2)
IEEE Transactions on Medical Robotics and Bionics     Hybrid Journal   (Followers: 5)
IEEE Transactions on Neural Networks and Learning Systems     Hybrid Journal   (Followers: 53)
IEEE Transactions on Robotics     Hybrid Journal   (Followers: 71)
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews     Hybrid Journal   (Followers: 16)
IET Cyber-systems and Robotics     Open Access   (Followers: 2)
IET Systems Biology     Open Access   (Followers: 1)
Industrial Robot An International Journal     Hybrid Journal   (Followers: 2)
Intelligent Control and Automation     Open Access   (Followers: 6)
Intelligent Service Robotics     Hybrid Journal   (Followers: 2)
International Journal of Adaptive, Resilient and Autonomic Systems     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Pervasive and Ubiquitous Computing     Full-text available via subscription   (Followers: 4)
International Journal of Advanced Robotic Systems     Full-text available via subscription   (Followers: 1)
International Journal of Agent Technologies and Systems     Full-text available via subscription   (Followers: 4)
International Journal of Ambient Computing and Intelligence     Full-text available via subscription   (Followers: 3)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 3)
International Journal of Applied Evolutionary Computation     Full-text available via subscription   (Followers: 3)
International Journal of Artificial Life Research     Full-text available via subscription  
International Journal of Automation and Control     Hybrid Journal   (Followers: 11)
International Journal of Automation and Control Engineering     Open Access   (Followers: 5)
International Journal of Automation and Logistics     Hybrid Journal   (Followers: 3)
International Journal of Automation and Smart Technology     Open Access   (Followers: 3)
International Journal of Bioinformatics Research and Applications     Hybrid Journal   (Followers: 15)
International Journal of Biomechatronics and Biomedical Robotics     Hybrid Journal   (Followers: 2)
International Journal of Cyber Behavior, Psychology and Learning     Full-text available via subscription   (Followers: 7)
International Journal of Humanoid Robotics     Hybrid Journal   (Followers: 6)
International Journal of Imaging & Robotics     Full-text available via subscription   (Followers: 3)
International Journal of Intelligent Information Technologies     Full-text available via subscription   (Followers: 2)
International Journal of Intelligent Machines and Robotics     Hybrid Journal   (Followers: 3)
International Journal of Intelligent Mechatronics and Robotics     Full-text available via subscription   (Followers: 5)
International Journal of Intelligent Robotics and Applications     Hybrid Journal  
International Journal of Intelligent Systems Design and Computing     Hybrid Journal   (Followers: 1)
International Journal of Intelligent Unmanned Systems     Hybrid Journal   (Followers: 3)
International Journal of Machine Consciousness     Hybrid Journal   (Followers: 6)
International Journal of Machine Learning and Cybernetics     Hybrid Journal   (Followers: 34)
International Journal of Machine Learning and Networked Collaborative Engineering     Open Access   (Followers: 13)
International Journal of Mechanisms and Robotic Systems     Hybrid Journal   (Followers: 2)
International Journal of Mechatronics and Automation     Hybrid Journal   (Followers: 5)
International Journal of Robotics and Automation     Full-text available via subscription   (Followers: 8)
International Journal of Robotics and Control     Open Access   (Followers: 3)
International Journal of Robotics Applications and Technologies     Full-text available via subscription   (Followers: 1)
International Journal of Robotics Research     Hybrid Journal   (Followers: 15)
International Journal of Space-Based and Situated Computing     Hybrid Journal   (Followers: 2)
International Journal of Synthetic Emotions     Full-text available via subscription  
International Journal of Tomography & Simulation     Full-text available via subscription   (Followers: 1)
Journal of Automation and Control     Open Access   (Followers: 9)
Journal of Biomechanical Engineering     Full-text available via subscription   (Followers: 12)
Journal of Computer Assisted Tomography     Hybrid Journal   (Followers: 2)
Journal of Control & Instrumentation     Full-text available via subscription   (Followers: 19)
Journal of Control, Automation and Electrical Systems     Hybrid Journal   (Followers: 13)
Journal of Intelligent and Robotic Systems     Hybrid Journal   (Followers: 6)
Journal of Intelligent Learning Systems and Applications     Open Access   (Followers: 4)
Journal of Physical Agents     Open Access   (Followers: 1)
Journal of Robotic Surgery     Hybrid Journal   (Followers: 3)
Journal of Robotics     Open Access   (Followers: 6)
Jurnal Otomasi Kontrol dan Instrumentasi     Open Access  
Machine Translation     Hybrid Journal   (Followers: 13)
Proceedings of the ACM on Human-Computer Interaction     Hybrid Journal   (Followers: 1)
Results in Control and Optimization     Open Access   (Followers: 3)
Revista Iberoamericana de Automática e Informática Industrial RIAI     Open Access  
ROBOMECH Journal     Open Access   (Followers: 1)
Robotic Surgery : Research and Reviews     Open Access   (Followers: 1)
Robotica     Hybrid Journal   (Followers: 5)
Robotics and Autonomous Systems     Hybrid Journal   (Followers: 19)
Robotics and Biomimetics     Open Access   (Followers: 1)
Robotics and Computer-Integrated Manufacturing     Hybrid Journal   (Followers: 7)
Science Robotics     Full-text available via subscription   (Followers: 11)
Soft Robotics     Hybrid Journal   (Followers: 5)
Universal Journal of Control and Automation     Open Access   (Followers: 2)
Unmanned Systems     Hybrid Journal   (Followers: 4)
Wearable Technologies     Open Access   (Followers: 3)

           

Similar Journals
Journal Cover
Journal of Control, Automation and Electrical Systems
Journal Prestige (SJR): 0.274
Citation Impact (citeScore): 1
Number of Followers: 13  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2195-3880 - ISSN (Online) 2195-3899
Published by Springer-Verlag Homepage  [2468 journals]
  • New Criterion for the Stability of Discrete-Time Systems with State
           Saturation and Time-Varying Delay

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      Abstract: The problem of global asymptotic stability analysis of discrete-time systems with state saturation and time-varying delay is investigated in this study. A new sufficient global asymptotic stability criterion is derived with the help of the reciprocal convex lemma and Wirtinger-based inequality for estimating the sum terms in the forward difference of the Lyapunov function. Numerical examples showing the usefulness of the proposed results and comparison with the existing results are also given.
      PubDate: 2023-06-02
       
  • Multi-robots Coordination System for Urban Search and Rescue Assistance
           Based on Supervisory Control Theory

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      Abstract: The application of robots in urban search and rescue (USAR) is a domain receiving increasing attention from the scientific community, although it does not yet grant the requirements for field implementation, such as robustness, reliability, and safety. In this work, we propose a multi-robots coordination system based on the supervisory control theory (SCMCS) divided into two layers: reactive and deliberative. While the reactive layer assures that each robot attains to the critical USAR requirements in face of unexpected events by means of a maximally permissive and nonblocking supervisory control, the deliberative layer coordinates the multi-robots system exploiting heuristics to perform the missions with efficiency. The formal modeling and synthesis of supervisors are applied to a case study based on the international USAR agency procedures. The SCMCS architecture is implemented in a simulated scenario composed of two ground robots and two aerial robots executing USAR missions in a post-disaster scene subject to unexpected events such as robot failures, victims and dangers detection and battery losses. The simulation results show that SCMCS is capable of efficiently coordinating the tasks assigned to multiple robots while guaranteeing critical requirements even in face of the uncertainties of robots and environments in USAR disasters.
      PubDate: 2023-06-01
       
  • N-Step-Ahead Optimal Control of a Compartmental Model of COVID-19

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      Abstract: This paper uses a compartmental model that accounts for some of the main features of the COVID-19 pandemic. Assuming a control that represents the aggregated intensity of non pharmaceutical interventions, such as lockdown in varying degrees and the use of masks and social distancing, this text proposes an N-step-ahead optimal control (NSAOC) method that is easy to calculate and provides a guideline for implementation. The compartmental model is extended to account for vaccination, and the N-step-ahead optimal control is calculated for this case as well. The proposed control is robust to parameter variation in all model parameters, when they are assumed to be normally distributed about nominal values. In addition, the proposed NSAOC is shown to compare favorably with a recently proposed PID-like controller.
      PubDate: 2023-06-01
       
  • A Case Study-Based Review of the Impacts of Inverter-Interfaced Wind Power
           Plants on Distance Protections

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      Abstract: This paper conducts a case study-based review related to the impacts of Inverter-Based Wind Power Plants (IBWPP), namely Full-Converter Generators (FCG) and Doubly-Fed Induction Generators (DFIG), on self-polarized quadrilateral and memory-polarized mho distance protection functions. Besides evaluating two of the main polarization strategies for distance protection, different grid code requirements, concerning the reactive power regulations by IBWPP upon grid disturbances, and the impact of the DFIG crowbar circuit were analyzed. To do so, several contingency scenarios varying the type, resistance, and fault location were simulated, in a system with a typical IBWPP interconnection topology with the primary grid. By assessing the impedance trajectories in the complex plane and the phase comparators, usually considered by commercial relays, it was possible to prove and explain in detail the misoperations of the distance protection functions for systems with IBWPP.
      PubDate: 2023-06-01
       
  • Stabilizing and Enhancing Frequency Control of Power System Using
           Decentralized Observer-Based Sliding Mode Control

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      Abstract: This paper proposes a robust decentralized single-phase double integral sliding mode control (SMC) method combined with state observer for load frequency control of the multi-area power system integrated solar power sources. This study elaborates on how the proposed method secures the stability of the whole system as well as keeps frequency values within their safety ranges. Firstly, the designed observer ensures exact estimation of the actual states leading to convergence of estimated errors to zero. Secondly, a single-phase double integral sliding surface is designed completely based on estimated state variables achieved by the observer. A single-phase approach is employed to set up a sliding surface containing the initial point of the system trajectory and remove the reaching phase. Then, a new double integral SMC rule is developed to secure the finite time reachability as well as eliminate the oscillating and chattering issues. Finally, the effectiveness of the proposed method is validated thoroughly by simulation studies on LFC schemes in three-area power systems and the IEEE 39-Bus New England system to expose its advantages via various impact conditions.
      PubDate: 2023-06-01
       
  • Robust Adaptive Terminal Fixed Time Sliding-Mode Control for a Secure
           Communication of T-S Fuzzy Systems

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      Abstract: This paper presents a robust adaptive boundary layer thickness (BLT) of sliding mode control (SMC) for a secure communication of chaos-based system. First, chaotic system was remodeled into the Takagi–Sugeno (T-S) fuzzy format. Second, a novel SMC with an adaptive finite time reaching phase and an adaptive BLT of fixed time sliding phase was proposed to synchronize the master and slave systems (MSSs). The matched disturbances on three channels of the secure communication system (SCS) were rejected by the proposed method. To prove that the proposed theories are corrected, the Lyapunov condition was used to meet the goal. Furthermore, the simulation study was used to verify the correction and effectiveness of the proposed algorithm. The tracking errors and reaching times are very small. The sent and received data were precisely tracked each other in the short time.
      PubDate: 2023-06-01
       
  • An Aeropendulum-Based Didactic Platform for the Learning of Control
           Engineering

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      Abstract: Due to the complexity of the subjects covered in control engineering courses, many students have difficulty in resolving practical control problems. In order to solve this problem, didactic plants can be used as teaching tools to allow students to practice the design of controllers through the investigation of real physical systems. In this sense, this paper proposes an aeropendulum-based didactic platform to be used in control engineering courses. This paper cover all fundamental concepts about aeropendulums, a simulation model built and some suggested practices that can be done using the proposed platform. The experimental results show that the proposed didactic platform is fully functional.
      PubDate: 2023-06-01
       
  • Persistent Voltage Profiling of a Wind Energy-Driven Islanded Microgrid
           with Novel Neuro-fuzzy Controlled Electric Spring

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      Abstract: Electricity from renewable energy is certainly the most prominent alternative to deliver power to remote locations; however, its reliability is affected by the intermittency of the renewable source. A smart load technology called ‘electric spring (ES)’ can compensate for the intermittency and thereby maintain the voltage level constant for critical loads with an efficient and reliable control approach. This paper suggests wind energy-fed generation as the only and primary source for an isolated remote microgrid. The voltage level of the system remained unaltered by deploying a voltage source converter-based ES with a novel artificial neural network-based fuzzy controller. The novelty of the system is that it can operate significantly under varying load, variable torque, and varying wind speed conditions by exchanging power between critical and non-critical loads. Further simulation results ensure the credibility of the electric spring–artificial neural network-based fuzzy controller system in terms of stability and performance parameters such as settling time, rise time, and maximum overshoot. Additionally, the total harmonic distortion of the system is found to be well within the boundary of the acceptable range that proclaims its feasibility and applicability in a real-world scenario.
      PubDate: 2023-06-01
       
  • Bifurcation of Double-Input DC–DC Buck Buck-Boost Fused Converter

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      Abstract: The bifurcation behavior a double-input DC–DC buck buck-boost fused converter (DIBBFC) has been discussed in this paper. The considered converter is used to ingrate two different levels of DC voltages for one controlled output voltage. The voltage mode control method is used to obtain desired output voltage while the inductor current is maintained at desired level through the current mode control strategy in this multi-input converter. The discrete mapping of the DIBBFC is established with these two controllers at a time. The limit of reference current is obtained, beyond which the converter has suffered from period-2 and period-4 bifurcation. The theoretical behavior of period-1, period-2, and period-4 state operations is verified by implementing the control in both simulation and real-time environments. The results successfully satisfy the theoretical claim of the bifurcation analysis in both environments.
      PubDate: 2023-06-01
       
  • Dynamic Output Feedback Control for Asynchronous Switched Systems in
           Network Environments Subject to Deception Attack

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      Abstract: This paper studies the problem of dynamic output feedback control for networked switched systems which suffer from the asynchronism and deception attack. Different from the general asynchronism that only occurs when there exists at least once switching during the transmission interval, deception attack falsifies the sampled information containing the measured output and switching signal at any transmission instants, and causes the asynchronous control input with nonlinear disturbance inevitably. Then, by employing the different closed-loop systems caused by switching and attack, a stochastic upper bound for controller-mode-dependent Lyapunov function is obtained under the proposed randomized transmission scheme. Under the dynamic output feedback controller, a set of sufficient conditions for this upper bound tending to zero is developed, which indicates the almost sure asymptotic stability of switched systems with the sequence-based average dwell time method. Finally, the effectiveness of the theoretical result is illustrated by adjusting the power voltage in switched RLC circuit model.
      PubDate: 2023-06-01
       
  • Leader-Following Consensus of Multi-order Fractional Multi-agent Systems

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      Abstract: The current study investigates the leader-following consensus problem for fractional-order multi-agent systems with different fractional orders under a fixed undirected graph. A virtual leader with the desired path is assumed, while the agents are chosen as fractional-order integrators with various orders. It is proved that the leader-following consensus problem for this multi-agent system is equivalent to the stability analysis of a multi-order fractional system. At first, the Laplace transform is employed to verify the asymptotic stability of a particular case of multi-order fractional systems. It is shown that if the state matrix is negative definite and a certain inequality between the fractional orders is met, the mentioned system is asymptotically stable. This inequality can be easily checked without any need for complex calculations. Accordingly, it is demonstrated that if a certain inequality is met among the fractional orders of a multi-order multi-agent system, the leader-following consensus of the mentioned heterogeneous multi-agent system can be realized. Numerical examples demonstrate the accuracy of the established leader-following consensus protocol.
      PubDate: 2023-06-01
       
  • Experimental Realization of a Novel 48-Sector Space Vector
           Decomposition-Based SVPWM Technique for A Six-Phase Two-Level VSI-Fed
           Six-Phase Asymmetrical Induction Motor

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      Abstract: The six-phase two-level voltage source inverter (SPTLVSI) fed the six-phase asymmetrical induction motor (SPAIM), which has a stator that splits the three-phase windings into two groups those are shifted electrically by \(30^{\circ }\) . It introduces significant current harmonics of the order of \(6k\pm 1\left( k=1,3,5\ldots \right) \) , which can be mapped into the non-flux/torque producing \(\left( X-Y \right) \) sub-plane. These harmonics cause only losses in the motor winding as they do not take part in torque production. The authors propose a new space vector modulation technique named the 48-sector vector space decomposition-based space vector pulse-width modulation (C6 \(\phi \) SVPWM48) technique, which has been verified using MATLAB (Matrix Laboratory) simulation and reported by the authors in the previous work, and the work is extended in this paper. This paper presents a contribution to compare the proposed technique with the 12-sector vector space decomposition-based space vector pulse-width modulation (C6 \(\phi \) SVPWM12) based on CMV (Common mode voltage) , switching loss of the inverter, torque ripple, and stator current distortion. The C6 \(\phi \) SVPWM48 technique has been implemented experimentally on the SPTLVSI fed a prototype of 200 V, 2 kW SPAIM. The C6 \(\phi \) SVPWM48 technique is controlled using the ARM cortex M4 32-bit microcontroller (STM32F407VGT6) and the SPTLVSI during steady-state and dynamic operating conditions. The experimental results of the C6 \(\phi \) SVPWM48 technique are discussed and presented. Furthermore, it reduces the harmonic current drawn by the machine to a large extent, consequently, the copper losses of the machine and also reducing the average switching loss.
      PubDate: 2023-06-01
       
  • Control Design of Single-Phase T-Type Inverters for PV Residential
           Applications: A Practical Approach

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      Abstract: In this research, a practical solution is proposed to enhance the performance of the single-phase DC/AC converter, which is usually used as an interface between the renewable energy source and the power grid in residential applications. In order to meet the strict requirements of the grid code, various solutions have been applied. In detail, the multilevel T-type topology is employed to further reduce the distortion of the output current. In control design, adaptive sliding mode control designed in discrete-time domain is adopted to enhance the robustness of the inner current control-loop against parameter variations. For the dc bus voltage control loop, multiple objectives such as negligible overshoot and limited inrush current during the startup process, and reduced voltage oscillation with the sudden change of the transferred power, can be fulfilled by using state-machine programming and Fuzzy-PI controller. The effectiveness of the proposed solution is verified by numerical simulations where all control algorithms are implemented in C-language. This technique guarantees consistency between simulations and practical implementations based on digital platforms.
      PubDate: 2023-06-01
       
  • An Automatic Column Wiring Resistance Algorithm for Static Reconfiguration
           of PV Arrays and Analysis of Reconfigured T-C-T and T-T-C-L Under Dynamic
           Shading Conditions

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      Abstract: Reconfiguration techniques play an essential role in maximum power enhancement from PV arrays under partial shading conditions. Reconfiguration techniques are of two types based on the electrical connection. If the electrical connection remains the same after the rearrangement of panels, then that reconfiguration is static; otherwise, it is dynamic. Out of all the static reconfiguration techniques, the fixed column reconfiguration technique is the most flexible method. For static reconfiguration, the length of the column wire should be more than the usual connection. This paper proposes an algorithm for finding the column wiring resistance for fixed column static reconfiguration of a PV array. The proposed algorithm is applied to reconfigure Total-Cross-Tied (T-C-T) and Triple-Tied-Cross-Linked (T-T-C-L) PV array configurations. The performance of T-C-T and T-T-C-L PV arrays is analyzed in four reconfigured patterns by considering cross-ties resistance and column wiring resistance under dynamic shading conditions.
      PubDate: 2023-06-01
       
  • Design, Implementation and Testing of a Spark-Ignition Engine Management
           System

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      Abstract: The engine management system (EMS) is arguably one of the most critical and complex components of a spark ignition (SI) engine. Modern EMS incorporates various components (like sensors, actuators, control strategies, etc.) to achieve an appropriate engine response. Even though EMS has been researched for a long time, most existing studies have just focused on individual control modules with no consideration about their interaction or how they work when brought together. For this reason, this paper presents the entire design, implementation and testing of EMS for a SI system. In particular, this investigation shows each EMS module, along with tests of the EMS. In addition, we carried out numerous experimental tests (such as stability analysis, reference tracking, and disturbance rejection) to assess the custom EMS. From vehicle performance test, we obtained a slight power (1.2%) and torque (1.3%) percentage errors between custom and original EMS. Similarly, percentage error obtained for vehicle emission tests for hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) are 29.2%, 21.4% and 65.9%, respectively, which highlighted a slightly richer mixture once compared to custom with the original EMS. Lastly, experiment results show the success of the proposed EMS.
      PubDate: 2023-06-01
       
  • Design of Adaptive Cruise Control with Control Barrier Function and
           Model-Free Control

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      Abstract: This work describes the design of an adaptive cruise control (ACC) applied to a realistic automotive simulation model, considering both upper- and lower-level controllers. The upper-level controller provides a desired acceleration/deceleration to a host vehicle to maintain a safe distance related to a leader vehicle or to track a desired cruise speed otherwise. On the other hand, the lower-level controller provides control signals to the throttle and brake pedals of the host vehicle aiming to track the desired acceleration/deceleration setpoint from the upper-level controller. For the upper-level controller, we consider a control framework that unifies the stability/tracking objective, expressed as a control Lyapunov function (CLF), the safety constraint, expressed as a control barrier function (CBF), and the comfort constraint, by means of a quadratic programming (QP), where safety must be prioritized. The lower-level controller is implemented considering a model-free control. The results, obtained by numerical simulations, demonstrate that the safe distance between the vehicles is ensured and the desired cruise speed is tracked adequately. Therefore, the stability/tracking objective and the safety and comfort constraints, related to the upper-level controller, are properly satisfied. The lower-level controller tracks the desired acceleration/deceleration demanded by the upper-level controller with good performance.
      PubDate: 2023-06-01
       
  • ANFIS Wind Speed Estimator-Based Output Feedback Near-Optimal MPPT Control
           for PMSG Wind Turbine

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      Abstract: This paper proposed an estimator-based adaptive near-optimal output feedback control algorithm for maximum power point tracking control of wind energy conversion system. Firstly, the adaptive neuro-fuzzy inference system (ANFIS) estimator is designed to estimate the wind speed instead of direct measurement. The parameters of ANFIS are updated using hybrid least square technique to reduce the computation. Next, the near-optimal controller is utilized for nonlinear system to track the optimal rotor speed. The unknown components in the dynamic of controlled system are approximated by two neural networks. The stability of the proposed controller as well as the convergence of updated parameters is mathematically proven. Moreover, the presented controller requires only the outputs feedback of the system to execute the algorithm, so this is model-free output feedback scheme. Finally, four simulation models with two scenarios are setup to compare the performances of the proposed scheme with other techniques using Q-learning estimator and classic PI controller. The simulation results show that the presented ANFIS estimator-based adaptive near-optimal controller guarantees the best performances with the lowest error of rotor speed and output power in comparison with others for both step wind speed and random wind speed.
      PubDate: 2023-06-01
       
  • Robust Fault Tolerant Control for Uncertain Switched Systems with Time
           Delay

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      Abstract: This article concerns the problem of robust fault tolerant control for uncertain switched systems with time delay in the presence of actuators faults. Based on an observer synthesis, a new technique of fault detection, localization and reconfiguration is established to maintain asymptotic stability when an actuator fails temporary or permanently. The design problem is formalized in the form of linear matrix inequalities. To reduce the conservatism of the obtained conditions, slack variable technique is used. To demonstrate the effectiveness of the proposed approach, simulation results are given in terms of two examples and comparative study.
      PubDate: 2023-06-01
       
  • A New Method for Optimal Coordination of Overcurrent and Distance Relays

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      Abstract: The protection of the electrical power system is a complex task, especially at the level of the transmission system, because according to statistical indicators, this is where the greatest number of faults occur. The protection of transmission lines can be performed by several protection schemes. Among them, those that use relays with distance and directional overcurrent functions, which must operate in a coordinated manner. However, performing the coordination between these relays is not trivial and, with the use of conventional methods, it becomes rudimentary and laborious. Here, a new method was proposed, in which the coordination task between the overcurrent and distance functions was treated as an optimization problem based on Genetic Algorithm. For this, in the objective function developed, a new decision variable was inserted, called reverse zone time, applied as a backup in the conventional distance function of the relay. In addition, the value of the coordination interval between the overcurrent and distance functions of the relays was varied, seeking to evaluate the influence of this parameter on the time of the second zone of the distance relay. The proposed method was tested in a standard network of the 8-bus electrical system and the results presented proved its efficiency, as it allowed the reduction of the operating time of the overcurrent and distance functions of the relays.
      PubDate: 2023-05-31
       
  • Observer-Based Output Feedback Control Using Invariant Polyhedral Sets for
           Fuzzy T–S Models Under Constraints

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      Abstract: We propose a systematic design method to compute an observer-based output feedback controller for fuzzy Takagi–Sugeno (T–S) systems with unmeasurable premise variables, subject to state and control constraints, based on the theory of invariant sets. Sufficient conditions are established for a polyhedron defined in the augmented state-space (state + estimation error) to be positively invariant. From these conditions, a bilinear optimization problem is formulated for the simultaneous computation of the gains of the controller and of a positively invariant polyhedron guaranteeing the satisfaction of the constraints. Numerical examples illustrate the effectiveness of the method.
      PubDate: 2023-05-30
       
 
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