C. Gonzalez

Universidad de Extremadura, Ara Pacis Augustalis, Extremadura, Spain

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Publications (18)9.91 Total impact

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    R. Dominguez · E. Onieva · J. Alonso · J. Villagra · C. Gonzalez
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    ABSTRACT: In this work, a solution for clustering and tracking obstacles in the area covered by a LIDAR sensor is presented. It is based on a combination of simple artificial intelligence techniques and it is conceived as an initial version of a detection and tracking system for objects of any shape that an autonomous vehicle might find in its surroundings. The proposed solution divides the problem into three consecutive phases: 1) segmentation, 2) fragmentation detection and clustering and 3) tracking. The work done has been tested with real world LIDAR scan samples taken from an instrumented vehicle.
    01/2011; DOI:10.1109/ISDA.2011.6121753
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    ABSTRACT: In this paper, the problem of crossing the inter-sections is studied. A controller is designed based on a hybrid automaton. The design procedure is presented into two cases. The problem of crossing with one automatic car and one manual car from intersection is studied in case one. The safe crossing (i.e. fixing safe distance between two automatic car)of two automatic cars is studied in case two. Simulation is done by the model which is identified by the real data from the car Citroen C3. Simulation results show the efficiency of the controller in both cases.
    Intelligent Transportation Systems (ITSC), 2010 13th International IEEE Conference on; 10/2010
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    ABSTRACT: Cars capable of driving in urban environments autonomously are today one of the most challenging topics in the intelligent transportation systems (ITS) field. This paper deals with the evolution of Clavileño -a gas propelled vehicle-in its automation process towards a fully autonomous car driving in a real word. So, the required modifications for a mass-produced car in order to equip it with automatic driving capabilities; the on-board sensor systems to analyze the environment; the autonomous guidance system as well as the cooperative maneuvers implemented and the local evaluation system are presented. The system has been tested in a controlled area with other vehicles in several experiments with good results.
    Intelligent Transportation Systems (ITSC), 2010 13th International IEEE Conference on; 10/2010
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    ABSTRACT: The significant increment in the number of advanced driver assistance systems (ADAS) in mass-produced cars suggest the idea of autonomous or semi-autonomous vehicles driving in roads in a medium-large term. Consequently, a system to allow the communication among this kind of vehicles and manual driven vehicles will have to be used in order to permit the circulation of both of them at the same time. Two communication modes have to be taken into account. First, a vehicle-to-vehicle communication (V2V) to permit the traffic data flow among cars. Second, a vehicle-to-infrastructure communication (V2I) to allow a central station to coordinate the movements of the vehicle in case of a failure in the V2V. In this paper we present an architecture capable of operating either in autonomous vehicles or manual driven vehicles and coordinating their movements based on a V2I communication. Two mass-produced vehicles are used in order to test the behavior of the architecture implementation. Experimental trials to study the response of the system and the information flow have been carried out.
    09/2010
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    E. Onieva · V. Milanés · C. González · T. de Pedro · J. Pérez · J. Alonso
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    ABSTRACT: Artificial intelligence techniques applied to control processes are particularly useful when the elements to be controlled are complex and can not be described by a linear model. A trade-off between performance and complexity is the main factor in the design of this kind of system. The use of fuzzy logic is specially indicated when trying to emulate such human control actions as driving a car. This paper presents a fuzzy system that cooperatively controls the throttle and brake pedals for automatic speed control up to 50km/h. It is thus appropriate for populated areas where driving involves constant speed changes, but within a range of low speeds because of traffic jams, road signs, traffic lights, etc. The system gets the current and desired speeds for the car and generates outputs to control the two pedals. It has been implemented in a real car, and tested in real road conditions, showing good speed control with smooth actions resulting in accelerations that are comfortable for the car's occupants.
    Robotica 06/2010; 28(04):509 - 516. DOI:10.1017/S0263574709005815 · 0.89 Impact Factor
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    Vicente Milanés · J. Perez · Enrique Onieva · Carlos González
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    ABSTRACT: A major research topic in intelligent transportation systems (ITSs) is the development of systems that will be capable of controlling the flow of vehicular traffic through crossroads, particularly in urban environments. This could significantly reduce traffic jams, since autonomous vehicles would be capable of calculating the optimal speed to maximize the number of cars driving through the intersection. We describe the use of vehicle-to-vehicle (V2V) communications to determine the position and speed of the vehicles in an environment around a crossroad. These data are used to estimate the intersection point, and a fuzzy controller then modifies the speed of the cars without right of way according to the speed of the car with right of way. Experimental tests conducted with two mass-produced cars on a real circuit at the facilities of the Instituto de Automa??tica Industrial, Consejo Superior de Investigaciones Cienti??ficas, Madrid, Spain, gave excellent results.
    IEEE Transactions on Intelligent Transportation Systems 04/2010; 11(1-11):243 - 248. DOI:10.1109/TITS.2009.2036595 · 2.47 Impact Factor
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    V. Milanes · C. Gonzalez · J. E. Naranjo · E. Onieva · T. De Pedro
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    ABSTRACT: Reducing the number of traffic accidents is a declared target of most governments. Since dependence on driver reaction is the main cause of road accidents, it would be advisable to replace the human factor in some driving-related tasks with automated solutions. To automate a vehicle, it is necessary to control the actuators of a car, i.e., the steering wheel, accelerator, and brake. This paper presents the design and implementation of an electro-hydraulic braking system consisting of a pump and various valves, allowing the control computer to stop the car. It is assembled in conjunction with the original circuit for the sake of robustness and to permit the two systems to halt the car independently. This system was developed for installation in a commercial Citroën C3 Pluriel of the AUTOPIA program. Various tests were carried out to verify its correct operation, and an experiment showing the integration of the system into the longitudinal control of the car is described.
    International Journal of Automotive Technology 02/2010; 11(1):89-95. DOI:10.1007/s12239-010-0012-6 · 0.82 Impact Factor
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    V Milanés · J Pérez · E Onieva · C González · T De Pedro
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    ABSTRACT: This paper deals with autonomous vehicles. This could be considered a utopian goal nowadays but recent advances bring it closer than ever. Automation of the actuators involved in the management of a car, and control of the steering wheel constitute two of the most complex issues involved. We here describe an automatic power steering architecture to manage the steering wheel via an Ethernet controller. An on-board PC is connected to the controller to permit handling by computer generated signals. An electric car has been equipped with the system, and we present the results of tests of the behaviour of the system in real situations on the private driving circuit at the IAI facilities.
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    V. Milanés · E. Onieva · J. Pérez · T. de Pedro · C. González
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    ABSTRACT: Los sistemas de control de crucero adaptativo permiten, adecuando la velocidad, realizar el seguimiento del vehículo precedente en autopistas mientras este vehículo no se detenga. Sin embargo, en áreas urbanas donde la congestión del tráfico obliga a continuas detenciones, este sistema pierde funcionalidad ya que, una vez detenido el vehículo, el conductor debe reactivar el sistema. En este artículo, se presenta un sistema de control de velocidad mediante lógica borrosa para situaciones continuadas de parada y arranque, en las que la velocidad del vehículo es inferior a diez kilómetros por hora. El sistema se ha implantado y probado en un vehículo comercial con excelentes resultados.
    Revista iberoamericana de automática e informática industrial (RIAI) 10/2009; 6(4):61-68. DOI:10.1016/S1697-7912(09)70109-8 · 0.05 Impact Factor
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    V. Milanés · J.E. Naranjo · C. González · J. Alonso · T. de Pedro
    Revista iberoamericana de automática e informática industrial (RIAI) 10/2008; 5(4). DOI:10.1016/S1697-7912(08)70175-4 · 0.05 Impact Factor
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    J.E. Naranjo · C. Gonzalez · R. Garcia · T. de Pedro
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    ABSTRACT: The goal that a car be driven autonomously is far in the future and probably unreachable, but as a first step in that direction, adaptive cruise control (ACC) and Stop&Go maneuver systems are being developed. These kind of controllers adapt the speed of a car to that of the preceding one (ACC) and get the car to stop if the lead car stops. This paper presents one such system and related experiments performed on a real road with real cars. The driving system gets its input via an RTK DGPS device and communicates its positions to one another via a wireless local area network link. It outputs signals controlling the pressure on the throttle and brake pedals. The control system is based on fuzzy logic, which is considered best to deal with processes as complex as driving. Two mass produced Citroen Berlingo electric vans have been instrumented, providing them with computer controlled actuators over the brake and the throttle to achieve human-like driving. The results of the experiments show that the behavior of the vehicles is very close to human and that they adapt to driving incidences, increasing the safety of the driving and permitting cooperation with manually driven cars.
    IEEE Transactions on Vehicular Technology 08/2007; 56(4-56):1623 - 1630. DOI:10.1109/TVT.2007.897632 · 2.64 Impact Factor
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    ABSTRACT: Cybercars and dual mode vehicles are presently the most innovative testbeds for vehicular automation applications. The definition of standards and control architectures of the different automatic vehicle onboard systems is a necessary task to build a final prototype to be produced. Several classical architecture definitions have been made in the field of mobile robotics. These architectures are capable of dealing with sensorial inputs and environment and procedural knowledge to manage the different actuators of mobile robots in order to accomplish their missions. Autonomous vehicles are conceived as a link between mobile robotics and the field of vehicular technology, obtaining cars that may be as autonomous as a mobile robot but circulating in high demand environments and in different conditions, as compared to robots. In this paper we present the control architecture used in AUTOPIA program, used for automating mass produced cars. This architecture is to deal with sensorial information and wireless communication as main sensorial input and manages the three fundamental actuators in a car: throttle, brake and steering wheel. The final aim of this architecture is to cover an automatic driving system that can manage a set of maneuvers of a car in the same way human drivers do. At this moment, straight circulation, curve circulation, adaptive cruise control, stop and go and overtaking maneuvers are available and research continues in order to increment its number
    Intelligent Transportation Systems Conference, 2006. ITSC '06. IEEE; 10/2006
  • J. E. Naranjo · C. González · R. Garcia · T. De Pedro
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    ABSTRACT: The steering wheel automatic control for autonomous vehicles is presently one of the most interesting challenges in the intelligent transportation systems field. A few years ago, the researchers had to adapt motors or hydraulic systems in order to automatically manage the trajectory of a vehicle but, due to the automotive industry technological development, a new set of tools built into the mass produced cars allow the feasibility to be computer-controlled. This is the case of the electronic fuel injection, sequential automatic gearbox or the Electric Power Steering (EPS). In this paper we present the development of an autonomous vehicle's EPS control, based on a two layer fuzzy controller. The necessary computer and electronic equipment has been installed in a Citroen C3 Pluriel mass produced testbed vehicle and a set of experiments has been carried out to demonstrate the feasibility of the presented controllers in real situations.
    Applied Artificial Intelligence - 7th International FLINS Conference; 01/2006
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    ABSTRACT: The automatic control of the speed and the steering of a vehicle are two of the main steps in order to develop autonomous intelligent vehicles. In this paper, a development of steering control for automated cars based on fuzzy logic and its related field tests are presented. Artificial intelligence techniques are used for controlling a broad range of systems, trying to emulate the human behaviour when classical control models are too much complex and require a lot of design time. Particularly, fuzzy logic control techniques are well proved success methods for managing systems where there appear to be limitations for classical control. Our control system has been installed in two Citroen Berlingo testbed vans whose steering wheel has been automated and can be controlled from a computer. The main sensorial input is a RTK DGPS that gives us positioning with one-centimeter precision. The results of the realized experiments show a human like system performance with adaption capability to any kind of track.
    Intelligent Vehicles Symposium, 2004 IEEE; 07/2004
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    ABSTRACT: There is a broad range of robotics technologies that are currently being applied to the generic topic of intelligent transportation systems (ITS). One of the most important research topics in this field is adaptive cruise control (ACC), aiming at adapting the vehicle speed to a predefined value while keeping a safe gap with regard to potential obstacles. For this purpose, a monocular vision system provides the distance between the ego vehicle and the preceding vehicle on the road. The complete system can be understood as a vision-based ACC controller, based on fuzzy logic, which assists the velocity vehicle control offering driving strategies and actuation over the throttle of a car. This controller is embedded in an automatic driving system installed in two testbed mass-produced cars operating in a real environment. The results obtained in these experiments show a very good performance of the vision-based gap controller, which is adaptable to all speeds and safe gap selections.
    Intelligent Robots and Systems, 2004. (IROS 2004). Proceedings. 2004 IEEE/RSJ International Conference on; 01/2004
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    J.E. Naranjo · C. Gonzalez · J. Reviejo · R. Garcia · T. de Pedro
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    ABSTRACT: There is a broad range of diverse technologies under the generic topic of intelligent transportation systems (ITS) that holds the answer to many of the transportation problems. In this paper, one approach to ITS is presented. One of the most important research topics in this field is adaptive cruise control (ACC). The main features of this kind of controller are the adaptation of the speed of the car to a predefined one and the keeping of a safe gap between the controlled car and the preceding vehicle on the road. We present an ACC controller based on fuzzy logic, which assists the speed and distance vehicle control, offering driving strategies and actuation over the throttle of a car. The driving information is supplied by the car tachometer and a RTK differential GPS, and the actuation over the car is made through an electronic interface that simulates the electrical signal of the accelerator pedal directly to the onboard computer. This control is embedded in an automatic driving system installed in two testbed mass-produced cars instrumented for testing the work of these controllers in a real environment. The results obtained in these experiments show a very good performance of the gap controller, which is adaptable to all the speeds and safe gap selections.
    IEEE Transactions on Intelligent Transportation Systems 10/2003; 4(3-4):132 - 142. DOI:10.1109/TITS.2003.821294 · 2.47 Impact Factor
  • R. Garcia · T. de Pedro · J.E. Naranjo · J. Reviejo · C. Gonzalez
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    ABSTRACT: This paper presents techniques, related experiments and real results (not simulations) performed with two unmanned vehicles. The test zone is a private circuit with the characteristics of an urban track. The vehicles are common mass-produced cars, provided with automatic actuators operating on the car controls (power-assisted steering and accelerator). These actuators work commanded by a fuzzy logic based control system. The input information to the control system is provided by three elements: high precision GNSS, car tachometer and a wireless network environment.
    Intelligent Vehicle Symposium, 2002. IEEE; 07/2002
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    ABSTRACT: This document presents a fuzzy control application in the unmanned driving field. Two electric cars have been conveniently instrumented in order to transform them into platforms for automatic driving experiments. Onboard speed and steering fuzzy controllers are the core of the guiding system. Navigation is essentially DGPS-based providing obstacles detection and avoidance by means of artificial vision in a reactive manner
    IFSA World Congress and 20th NAFIPS International Conference, 2001. Joint 9th; 08/2001